128
GSFC X-673-64-1F ENGINEERING DRAWING STANDARDS MANUAL August 1994 N A T I O N A L A E R O N A U T I C S A N D S P A C E A D M I N I S T R A T I O N U . S . A .

Engineering Drawing Standard Manual

Embed Size (px)

Citation preview

Page 1: Engineering Drawing Standard Manual

GSFC X-673-64-1F

ENGINEERING DRAWING STANDARDS MANUAL

August 1994

NATION

AL A

ERO

NA

UTICS AND SPACE ADMIN

ISTRATION

U. S. A.

Page 2: Engineering Drawing Standard Manual
Page 3: Engineering Drawing Standard Manual

X-673-64-1F Supersedes GSFC X-673-64-1E/July 1991

ENGINEERING DRAWING STANDARDS MANUAL Mechanical Engineering Branch Goddard Space Flight Center Greenbelt, Maryland

August 1994

NATION

AL A

ERO

NA

UTICS AND SPACE ADMIN

ISTRATION

U. S. A. National Aeronautics and Space Administration

Goddard Space Flight Center Greenbelt, Maryland 20771 1994

Page 4: Engineering Drawing Standard Manual
Page 5: Engineering Drawing Standard Manual

i i i

DESCRIPTION OF REVISION

This revis ion, which supersedes the Goddard Space Fl ight Center (GSFC) Standard X-673-64-1E, Engineering Drawing Standards Manual , i s in tended to update and ref lect the la tes t formats and s tandards adopted by GSFC.

The fol lowing is a summary of the pr incipal changes and improvements incorporated in th is issue:

a . Addit ion of Composi te Mater ia l Drawing def ini t ion.

b . Changing of the s ignature to a pr in ted name in Ti t le b locks .

c . New example of the Metr ic Drawings format and tolerance presentat ion.

d . Improved placement of v iews on Types of Drawings samples to prevent unnecessary rework of drawings a t a la ter date .

e . New Engineer ing Order (EO) forms added; o ld EO forms wil l be phased out .

f . Addit ional notes on var ious topics added to Note Examples sect ion.

g . Delet ion of microf i lming requirements for drawing format .

h . Flow char t for f l ight projects redef ined.

Page 6: Engineering Drawing Standard Manual

iv

Page 7: Engineering Drawing Standard Manual

v

PREFACE

The GSFC Engineering Drawing Standards Manual i s the off ic ia l source for the requirements and in terpreta t ions to be used in the development and presentat ion of engineer ing drawings and re la ted documentat ion for the GSFC.

The Mechanical Engineer ing Branch, Mechanical Systems Divis ion, has been delegated the responsibi l i ty for in terpreta t ion, per iodic updates , and dis t r ibut ion of the GSFC Engineering Drawing Standards Manual .

Al l Engineer ing Directorate des ign organizat ions and their contractors shal l adhere to the requirements of th is manual when prepar ing GSFC engineer ing documentat ion for f l ight hardware and ground support sys tems.

Comments or inquir ies concerning th is manual should be directed to the Mechanical Engineer ing Branch, Code 722.

Dr . Allan Sherman Director of Engineer ing

Page 8: Engineering Drawing Standard Manual

vi

Page 9: Engineering Drawing Standard Manual

X-673-64-1F GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL vii

TABLE OF CONTENTS INTRODUCTION .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 . DRAWING ELEMENTS .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 . Drawing Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1 .2 . Mult isheet Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1 .3 . Zoning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1 .4 . Ti t le Block and Revis ion Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1 .5 . Drawing Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2. NOMENCLATURE .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.1 . Drawing Ti t le . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2 .2 . Abbrevia t ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2 .3 . Lis t of Mater ia l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2 .3 .1 . Requirements on the Body of the Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2 .3 .2 . Requirements in the Lis t of Mater ia l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2 .4 . Notes on Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2 .4 .1 . Secur i ty Classi f icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2 .4 .2 . Note Locat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2 .4 .3 . Numbering of Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2 .4 .4 . Note Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2 .4 .4 .1 . Dimension Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2 .4 .4 .2 . Heat Treat ing Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2 .4 .4 .3 . Joining Method Notes (welding, brazing, e tc . ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2 .4 .4 .4 . Pla t ing and Coat ing Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2 .4 .4 .5 . Surface Preparat ion Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2 .4 .4 .6 . Test ing and Inspect ion Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2 .4 .4 .7 . Threaded Inser ts — Cleaning and Ins ta l la t ion Notes . . . . . . . . . . . . . . . . . . . . . . . 20 2 .4 .4 .8 . Miscel laneous Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2 .4 .4 .9 . Informat ional Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2 .4 .5 . Local Character Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2 .4 .6 . General Dimensional Tolerance Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2 .5 . Specif icat ion Cal louts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3. DRAFTING PRACTICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.1 . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3 .2 . Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3 .2 .1 . Ink Lines and Plot ted Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3 .2 .2 . Penci l Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3 .2 .3 . Types of Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3 .2 .3 .1 . Center Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3 .2 .3 .2 . Dimension Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3 .2 .3 .3 . Leaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3 .2 .3 .4 . Break Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3 .2 .3 .5 . Phantom Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3 .2 .3 .6 . Sect ioning Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3 .2 .3 .7 . Extension Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3 .2 .3 .8 . Hidden Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3 .2 .3 .9 . St i tch Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3 .2 .3 .10. Out l ines or Vis ible Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3 .2 .3 .11. Datum Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3 .2 .3 .12. Cut t ing-Plane/Viewing-Plane Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3 .3 . Let ter ing and Numerals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3 .3 .1 . Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3 .3 .2 . Heights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3 .4 . Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 3 .5 . Posi t ioning the Par t on the Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Page 10: Engineering Drawing Standard Manual

X-673-64-1F GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

viii ENGINEERING DRAWING STANDARDS MANUAL

3.5 .1 . Pic tur izat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3 .5 .2 . Sect ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 3 .5 .3 . Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3 .5 .4 . Detai ls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3 .5 .5 . Ident i f icat ion of Sect ions , Views, and Detai ls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3 .5 .6 . Locat ing Sect ions, Views, and Detai ls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4. TYPES OF DRAWINGS .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.1. Al tered or Selected Vendor Par t Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4 .2 . Assembly Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4 .3 . Deta i l Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 4 .4 . Drawing Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4 .5 . Electr ical /Electronic Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

4 .5 .1 . Electr ical and Elect ronic Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 4 .5 .2 . Electr ical and Elect ronic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

4 .6 . Inseparable Assembly Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 4 .7 . Ins ta l la t ion Assembly Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 4 .8 . In terface Control Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4 .9 . Matched-Set Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4 .10. Mechanical Schemat ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 4 .11. Modif icat ion Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 4 .12. Out l ine Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 4 .13. Source Control Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4 .14. Specif icat ion Control Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 4 .15. Standard Par t Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 4 .16. Tabulated Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 4 .17. Tool ing Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 4 .18. Composi te Mater ia l Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

5. NUMBERING SYSTEM FOR DRAWINGS AND SUPPORTING DOCUMENTATION . 60 5.1 . Par t Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 5 .2 . Find or I tem Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 5 .3 . Order of Precedence of Specif icat ions and Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5 .3 .1 . Group I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 5 .3 .2 . Group I I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 5 .3 .3 . Group I I I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 5 .3 .4 . Group IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 5 .3 .5 . Group V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

6. ENGINEERING ORDER .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 6.1 . General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 6 .2 . Format Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

7. DRAWING REVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7.1 . Revis ion Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7 .2 . Revis ion Ident i f ica t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7 .3 . Revis ion of Mult isheet Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7 .4 . Revis ion Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7 .5 . Redrawn or Replaced Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

8. PARTS LIST AND INDEX LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 8.1 . Def ini t ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 8 .2 . Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

8 .2 .1 . Lis t Preparat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 8 .2 .2 . Lis t Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 8 .2 .3 . Revis ion Ident i f ica t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 8 .2 .4 . Delet ing I tems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 8 .2 .5 . Adding I tems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

8 .3 . Cover Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 8 .3 .1 . Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Page 11: Engineering Drawing Standard Manual

X-673-64-1F GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL ix

8.3 .2 . Entr ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 8 .4 . Par ts Lis t Cont inuat ion Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

8 .4 .1 . Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 8 .4 .2 . Entr ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

8 .5 . Index Lis t Cont inuat ion Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 8 .5 .1 . Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 8 .5 .2 . Entr ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

8 .6 . Find or I tem Number System of Ident i f icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 8 .6 .1 . Def ini t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 8 .6 .2 . Appl icat ion and Limita t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 8 .6 .3 . Drawing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

8 .7 . Lis t of Mater ia l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 8 .7 .1 . Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 8 .7 .2 . Entr ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

9. DOCUMENTATION MANAGEMENT .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 9.1. Typical Drawing Flow for Fl ight Projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 9 .2 . Archiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 9 .3 . Computer-Aided Design Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

9 .3 .1 . Presenta t ion of Computer-Generated Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 9 .3 .2 . Developing and Using Computer-Generated Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 9 .3 .3 . Specif icat ion Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

10. DESIGN REFERENCES, STANDARDS, AND SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 10.1 . Dimensioning and Tolerancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

10.1 .1 . Dimensioning and Tolerancing Pract ices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 10.1 .2 . Sta tements on Dimensioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

10.2 . Metr ic Dimensioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 10.2 .1 . SI Uni ts and Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 10.2 .2 . Uni t Convers ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

10.2 .2 .1 . Convers ion of Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 10.2 .2 .2 . Uni t Rounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

10.3 . Design References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 10.4 . Control of Surface Roughness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

10.4 .1 . Surface Texture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 10.4 .2 . Surface Texture Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 10.4 .3 . Surface Texture Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

10.5 . Thread Specif icat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 10.6 . Welding—Fusion and Resis tance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

10.6 .1 . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 10.6 .2 . Basic Weld Symbols and Their Locat ion Signif icance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

10.7 . Outgass ing of Spacecraf t Mater ia ls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 10.8 . Standards and Specif icat ions Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

10.8 .1 . Nat ional Bureau of Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 10.8 .2 . Federal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 10.8 .3 . Industr ia l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 10.8 .4 . Mil i tary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 10.8 .5 . NASA .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

10.9 . Standards and Specif icat ions Numerical Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 APPENDIX A. DESIGN REVIEW DOs AND DON'Ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 INDEX .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Page 12: Engineering Drawing Standard Manual

X-673-64-1F GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

x ENGINEERING DRAWING STANDARDS MANUAL

Page 13: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 1

INTRODUCTION

This drawing s tandards manual es tabl ishes the convent ions to be adhered to by engineer ing and draf t ing personnel in the preparat ion, revis ion, and complet ion of engineer ing drawings. This manual se ts for th the minimum requirements acceptable a t GSFC for the preparat ion of engineer ing drawings for f l ight hardware and ground support sys tems. The requirements specif ied herein are essent ia l to the s tandardizat ion of pract ices and to a uniform interpreta t ion of drawings .

A system, payload, or component assembly shal l be completely def ined by means of drawings , including l is ts , schematics , wir ing diagrams, and specif icat ions , to ensure that components fabr icated are in accordance with the design. The documentat ion informat ion shal l serve as a permanent record.

Fl ight hardware shal l be fabr icated in accordance wi th the approved design documents . These documents shal l ref lect the character is t ics and acceptance cr i ter ia for a l l mater ia ls , component /par ts , subsystems, and the complete system. The acceptance cr i ter ia for par ts and mater ia ls shal l be specif ied by s tandard specif icat ions when appl icable .

Engineer ing drawings are def ined as those drawings that communicate the requirements for the manufacture of the end-product i tems, their assembly, and their ins ta l la t ion in the end product .

The engineer ing drawings prepared by GSFC design personnel or contractors on GSFC drawing format us ing GSFC drawing numbers shal l be known as “Government Design Activ i ty Drawings .” Par ts made to these drawings typical ly would be manufactured through the Fabr icat ion Engineer ing Branch, Engineer ing Services Divis ion, GSFC. “Contractor Design Act ivi ty Drawings”””” (which are a company 's drawings bear ing the company name, address , federal code ident i f ica t ion, and drawing number) should be used when the company is designing and del iver ing the f in ished product in accordance with the terms of a NASA contract .

The Design Act ivi ty shal l be def ined as an act ivi ty having responsibi l i ty for the design of an i tem or system. The act ivi ty may be a government ent i ty , a contractor , a vendor , or another organizat ion such as a univers i ty .

Al though general ly in accordance with the Depar tment of Defense and industry pract ices and procedures , th is drawing s tandards manual does contain specif ic d if ferences and except ions to Engineering Drawing Pract ices , MIL-STD-100E. This manual , while not in tended as a manual of ins truct ion in the basic pr inciples of draf t ing, does se t for th the minimum requirements acceptable a t the GSFC. One of those requirements is that persons engaged in the preparat ion of drawings shal l have a thorough unders tanding of the fundamentals of draf t ing and geometr ical d imensioning and to lerancing ( in accordance wi th ANSI Y14.5M-1982, Dimensioning and Tolerancing ) in order to produce in terpretable drawings .

Page 14: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

2 ENGINEERING DRAWING STANDARDS MANUAL

Page 15: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 3

1. DRAWING ELEMENTS

1.1. Drawing Sizes

The fol lowing table def ines the s tandard drawing s izes , and their le t ter des ignat ions to be used a t GSFC:

Notes:

(a) Lengths for “J” ro l l s ize to be in l l - inch increments . (b) Not inclus ive of added protect ive margins of a t leas t 2 inches on both ends of

rol l s ize drawings.

1.2. Multisheet Drawings

Mult isheet drawings are permit ted in a l l s izes .

a . The f i rs t sheet of a mult isheet drawing shal l a lways contain the complete Ti t le b lock, Lis t of Mater ia l , Revis ion Block, and general notes .

b . Al l sheets of mult isheet drawings shal l be of the same le t ter s ize . Use of mul t isheet drawings shal l be found to be advantageous for cer ta in types of schematics and diagrams.

c . The sheets of “J” s ize drawings may be any of the above-noted lengths and may be in termixed in dif ferent lengths .

d . Sheet numbering for a l l f i rs t sheets shal l include the to ta l number of sheets , as “SHEET 1 OF 1,” “SHEET 1 OF 2,” e tc . Numbering of cont inuat ion sheets shal l be l imited to s ta t ing the specif ic sheet number (e .g . , “SHEET 2,” “SHEET 3”) wi thout specifying the to ta l number of sheets .

Letter Designation

Sheet Width ( inches)

Sheet Length ( inches)

Margin ( inches)

B 11 17 3/8 C 17 22 1/2 D 22 34 1/2 E 34 44 1/2 F 28 40 1/2 J 34 48 to 144(a) 1/2(b)

Page 16: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

4 ENGINEERING DRAWING STANDARDS MANUAL

1.3. Zoning

Vert ical and hor izonta l zoning may be used i f necessary to provide or ienta t ion to the f ie ld of drawings. Zoning is mandatory for mult isheet drawings “D” s ize and larger and s ingle-sheet drawings “E” s ize and larger . Zones shal l be ident i f ied by a lphabet ical (uppercase) and numerical entr ies in the margin spaces as indicated in Figure 1 . Zone s izes shal l be 8½ inches (width) by 11 inches ( length) for “E” and “J” s ize , 7 inches (width) by 10 inches ( length) for “F” s ize , and 5½ inches (width) by 8½ inches ( length) for “D” s ize .

SECURITY NOTATION (IF REQUIRED)

SECURITY CLASSIFICATION

TITLE BLOCK

VERTICAL ZONE IDENTIFICATIONALPHABETICALLY LETTEREDFROM BOTTOM EDGE

ALTERNATELOCATION OFGENERAL NOTES

REVISION NOTES

PREFERREDLOCATION OFGENERAL NOTES

HORIZONTAL ZONEIDENTIFICATION NUMBEREDFROM RIGHT-HAND EDGE

SECURITY CLASSIFICATION

DR

AW

ING

NU

MB

ER

ON

RE

VE

RS

ES

IDE

FO

R R

OLL

-SIZ

E D

RA

WIN

GS

AP

PR

OX

. 2-IN

CH

AD

DIT

ION

AL

MAR

GIN

FOR

PR

OTE

CTI

ON

OF

RO

LL-S

IZE

DR

AW

ING

S

AP

PR

OX

. 2-IN

CH

AD

DIT

ION

AL

MAR

GIN

FOR

PR

OTE

CTI

ON

OF

RO

LL-S

IZE

DR

AW

ING

S

DR

AW

ING

NU

MB

ER

ON

RE

VE

RS

ES

IDE

FO

R R

OLL

-SIZ

E D

RA

WIN

GS

2345

A

B

C

D

2345

A

B

C

D

1

1

Figure 1: Format for B, C, D, E, F, and J Size Drawings

1.4. Title Block and Revision Block

Tit le b locks and revis ion blocks shal l be prepared and completed as fo l lows:

The Ti t le b lock of s ingle-sheet drawings, f i rs t sheets of mult isheet drawings, and revis ion blocks shal l appear as shown in e i ther Figure 2a on page 5 (dimensional system/inches) or Figure 2b on page 6 (d imensional system/mil l imeters) . The informat ion required in the Ti t le b lock shal l be as specif ied or referenced by i tems 1 through 28, below. The Ti t le b lock of cont inuat ion sheets for mul t isheet drawings shal l conta in information l is ted in i tems 1 , 2 , and 4 through 11.

Page 17: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 5

20

11 10 9

21

8 6

22

5 4

1

3

23

2

24

24 25 26 27 28

71213

14 15 18 19

16

G DWT.CODE SHSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1NAME INIT DATE

DESIGNER

CHECKED

APPROVED

APPROVED

APPROVED-STRESS

APPROVED-ENGINEER

UNLESS OTHERWISE SPECIFIED - DIMENSIONS ARE IN INCHES

TOLERANCES:

.XXX.XX

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

NEXT ASSY USED ON

LIST OF MATERIAL

ITEM

NO

REQD REQD PART NO. DESCRIPTION MATERIAL MATERIAL SPEC & NO.

FRACTIONS125

±1/16

FOLD

LIN

E

SYM DESCRIPTION DATE APPROVAL

REVISION

GD

FOLDLINE

GREENBELT, MARYLANDNATIONAL AERONAUTICS AND

SPACE ADMINISTRATIONGoddard Space Flight Center

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

HARDNESS TEST NOT REQUIRED

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODE

THIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TITLE

±.02 ±.005 ±1°

DRAWN

ZONE

NON FLIGHT

REV

REV

F igure 2a: Sample “Ti t le and Revis ion Block” (Enlarged View) for Dimensional System/Inches

Page 18: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

6 ENGINEERING DRAWING STANDARDS MANUAL

SYM

REVISION

APPROVALDATEDESCRIPTIONZONE

FOLD

LIN

E

WTCODE SHSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

NAME INIT DATE

DESIGNER

DRAWN

CHECKED

MECHANICAL ENGINEER

SYSTEMS ENGINEER

ELECTRICAL ENGINEER

NEXT ASSY USED ON

LIST OF MATERIAL

ITEM

NO

PART NO DESCRIPTION MATERIAL MATERIAL SPEC & NO

GD

NATIONAL AERONAUTICS ANDGREENBELT, MARYLANDGoddard Space Flight Center

NON-DESTRUCTIVE EXAMINATION (NDE) NOT REQD

NDE REQUIRED PER S-313-009 CODE

THIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TITLE

FOLD

LIN

E

REQD REQD

STRESS ENGINEER

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

ON FIELD OF DRAWING THUS

HARDNESS TEST NOT REQUIRED

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

G DREV

REV

NON FLIGHTSPACE ADMINISTRATION

161918

17

1514

13 12 7

2827262524

24

2

23

3

1

45

22

68

21

91011

20 24

EDGES R 0.25 OR CHAMFER MAXREMOVE ALL BURRS AND SHARP

THIRD ANGLE PROJECTION

UNLESS OTHERWISE SPECIFIEDDIMENSION ARE IN MM

DIMENSION TOLERANCES

RAD/CHAM

METRIC/INCH

ANGLE

2 DECIMAL

1 DECIMAL

DECIMAL

METERSMICRO-

FINISH

3.2

IN

HYBRID

METRIC

±0.5

±1°

±0.25

±0.5

±1

F igure 2b: Sample “Ti t le and Revis ion Block” (Enlarged View) for Dimensional System/Mi l l imeters

Page 19: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 7

1 DRAWING NO.: See page 60.

2 “SH OF ” : Enter sheet number as appl icable . Indicate tota l sheets only on sheet 1 .

3 WT: Enter uni t weight calculated a t t ime of des ign i f required.

4 TITLE: See paragraph 2 .1 on page 11 for se lect ion and arrangement of drawing t i t le . See paragraph 3 .3 .2 on page 32 for drawing t i t le s ize .

5 SCALE: Enter scale . See paragraph 3 .4 on page 32 for se lect ion of scale .

6 CODE: For drawings prepared by the Goddard Space Fl ight Center (GSFC) with an off ic ia l GSFC drawing number , enter the three-digi t GSFC code ident i fying the group responsible for the drawing.

For drawings prepared by a contractor with a contractor drawing number and format , the contractor 's code number f rom the Commercial and Government Ent i ty (CAGE) Publ icat ion H4/H8(formerly Federal Supply Code for Manufacturers (FSCM) H4 and Federal Supply Codes for Non-Manufacturers (FSCNM) H8) shal l appear .

7 DATE: Enter date of in i t ia ls .

8 DESIGNER: Enter designer 's pr in ted name and in i t ia ls .

9 DRAWN: Enter draf tsman 's pr in ted name or i f drawn by the des igner , the designer’s pr in ted name may be repeated.

10 CHECKED: Enter design analyst ' s pr in ted name. This name shal l be an independent name from al l o ther names on the drawing. I t represents that the drawing has been checked agains t the parameters of th is drawing manual and, where possible , to form, f i t , funct ion, and feasib i l i ty . The checker must have a thorough unders tanding of the methods and pract ices of geometr ic to lerancing and be able to specify such pract ices in accordance with ANSI Standard Y14.5M-1982, Dimensioning and Tolerancing .

11 APPROVED: Enter the pr in ted names of GSFC personnel ass igned to approve the drawing. Project requirements for drawing names shal l vary f rom program to program, but each name shal l be ident i f ied. For example , af ter each approval name, note the fol lowing: “ENG” for engineer , “STRESS” for s t ress engineer , “QA” for qual i ty assurance engineer , “MATL” for mater ia ls engineer , “ELEC” for e lect r ical engineer , e tc . Al l names in l ine i tems 8 through 11 must be legible . The hand-wri t ten ini t ia ls on the paper or iginal are the off ic ia l approval of that document .

12 USED ON: Enter acronym name of program and acronym name of subsystem or exper iment where appl icable .

Page 20: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

8 ENGINEERING DRAWING STANDARDS MANUAL

13 NEXT ASSY: Enter drawing number on which the par t i s next u t i l ized, modif ied, or assembled. In the case of tool ing drawings , in the Next Assembly block refer to a general note that s ta tes “This drawing is used to fabr icate (drawing number) .” Ins ta l la t ion drawings should ref lect a top conf igurat ion drawing number as the next assembly. When a conf igurat ion drawing is not being produced, the ins ta l la t ion drawing shal l indicate by note “The ins ta l la t ion forms a par t of the conf igurat ion for program (project name) .”

14 EXAMINATION: The appropr ia te “Non-Destruct ive Examinat ion (NDE) Required” block shal l be checked off , and the addi t ion of the appl icable code or “see note XX” shal l be added where required. Refer to Test ing and Inspect ion Notes of the general notes sect ion paragraph 2 .4 .4 .6 on page 20.

15 FLIGHT HARDWARE and HARDNESS TESTING: The Fl ight Hardware block must be checked off when the par t is used in actual f l ight conf igurat ions . The appropr ia te Hardness Test ing block shal l be checked off regardless of whether the par t is f l ight hardware or not .

16 On CAD-produced drawings , add a 3 .5- inch- long by 0 .88- inch-high block as fo l lows:

THIS DRAWING WAS PRODUCED USING:

SOFTWARE: (a) VERSION: (b)

FILENAME: (c)

Notes:

(a) Sof tware used (example: “AUTOCAD”) (b) Vers ion of sof tware (example: “10c7”) (c) Fi lename (example: “GSFC1234”)

17 METRIC/HYBRID METRIC-INCH: Add “X” to type of drawing block.AAAA

18 ITEM NO.: Enter i tem numbers when more than one type of mater ia l or par t is required, and coordinate drawing cal louts on the drawing f ie ld . Par ts made of the same mater ia l , condi t ion, and specif icat ion shal l be ass igned only one i tem number , even though the par t may be required in var ious s izes and th icknesses . The quant i ty for such i tems in the Lis t of Mater ia l (L/M) shal l be s ta ted as “A/R” with the specif ic s izes spel led out in the f ie ld of the drawing. Refer to Figure 3 on page 10, Figure 34 on page 80, and Sect ion 8 .6 , Find or I tem Number System of Ident i f ica t ion, on page 79. Do not skip i tem numbers on new drawings .

19 REQD: Enter quant i ty of par ts required only for the par ts of an inseparable assembly or assembly drawing.

20 PART NO.: Enter ident i fying par t numbers when required (Government , contractor , vendor , or o ther) . On new drawings , group l ike i tems together .

Page 21: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 9

21 DESCRIPTION: Enter mater ia l descr ip t ion (pla te , e tc . ) or a par t name t i t le i f i t i s another drawing. Enclose reference informat ion such as fas tener s izes in brackets .

22 MATERIAL: Enter the mater ia l f rom which the par t i s fabr icated . Examples: “AL ALY”; “CRES”; “BE CU.”

23 MATERIAL SPEC.: Enter the appl icable mater ia l specif icat ions , number , and f inal condi t ion. Examples : “QQ-A-250/11 6061-T6” for AL ALY pla te ; “ASTM A582 303 COND A” for CRES bar .

The information required in the revis ion block shal l be as specif ied or referenced by i tems 24 through 28, below, and in accordance wi th “Drawing Revis ions ,” paragraph 7 , page 68.

24 REVISIONS - SYM: Enter revis ion symbol .

25 REVISIONS - ZONE: Enter zone (where used) .

26 REVISIONS - DESCRIPTION: Enter descr ipt ion of the revis ion ( refer to Sect ion 7 , “Drawing Revis ions”) .

27 REVISIONS - DATE: Enter date approved by author ized s igner(s) in b lock.

28 REVISIONS - APPROVAL: Enter s ignature of GSFC person ass igned to approve. I f change was by approved EO, drawing only needs approval of the draf tsman or person incorporat ing the change, and the checker . I f changes made are not covered by an EO, then approval must include the engineer .

Page 22: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

10 ENGINEERING DRAWING STANDARDS MANUAL

DETAIL DRAWING

INSEPARABLE ASSEMBLY DRAWING

ASSEMBLY DRAWING

INSEPARABLE ASSEMBLY DRAWING

DETAIL SHOWN & OPPOSITE DRAWING

PART NO.REQDITEMNO.

DESCRIPTION MATERIAL MATERIAL SPEC & NO.

WIRE BE CU QQ-C-530, COND 1/2 HT

PART NO.REQDITEMNO.

DESCRIPTION MATERIAL MATERIAL SPEC & NO.

1

2 MS21209C0415

PLATE

INSERT (4-40 UNC x .168 LG)

AL ALY

SEE NOTE 1

QQ-A-250/11 6061-T61

2

PART NO.REQDITEMNO.

DESCRIPTION MATERIAL MATERIAL SPEC & NO.

QQ-A-225/8 6061-T6

QQ-A-225/8 6061-T6

AL ALY

AL ALYBAR OPPOSITE

BAR SHOWN-1

-2

PART NO.REQDITEMNO.

DESCRIPTION MATERIAL MATERIAL SPEC & NO.

1

2

PLATE

INSERT (4-40 UNC x .168 LG)

AL ALY

SEE NOTE 1

QQ-A-250/11 6061-T6

MS21209C0415

GD1000001 PLATE ASSY

A/R

3

PART NO.REQDITEMNO.

DESCRIPTION MATERIAL MATERIAL SPEC & NO.

1

2

3

REQD

3

3

1

2

1

2

MS51957-12

GD1003451

GC1003467-2

GC1003467-1

GE1002500-2

GE1002500-1

4 SCREW (4-40 UNC 2A x .187 LENGTH)

BLOCK

PLATE

PADDLE ASSEMBLY OPPOSITE

PADDLE ASSEMBLY SHOWN

PLATE

CRES

Notes:

(a) Paint , adhesives, and protect ive coat ings shal l appear in note form. (b) Hardware shal l appear in L ist of Mater ia l wi th required quant i ty . (c) “A/R” shal l be used in REQD column when same mater ia l (same mater ia l

speci f icat ion and condi t ion) appears more than once in d i f ferent s izes in the f ie ld of the drawing.

(d) “A/R” may be used to indicate large quant i t ies of r ivets. (e) A mater ia l speci f icat ion shal l only appear once in the List of Mater ia l

unless mater ia l condi t ions vary or a Shown and Opposi te part is required. Sheet and plate shal l not be l is ted as separate i tems.

Figure 3: Examples of “L ist of Mater ia l ”

1.5. Drawing Format

The drawing format for the drawing s izes l is ted on page 3 , including zoning, drawing numbers , secur i ty c lass if ica t ion, e tc . , i s shown in Figure 1 , page 4 .

Page 23: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 11

2. NOMENCLATURE

2.1. Drawing Title

General informat ion for the select ion or development of a drawing t i t le is as fo l lows:

a . The t i t le should be as br ief as poss ible but should contain suff ic ient information to categor ize the par t proper ly and to dis t inguish i t f rom other s imilar par ts .

b . The drawing t i t le shal l consis t of the fo l lowing:

1 . Ident i fying noun or noun phrase .

2 . The most s ignif icant modif ier or modifying phrase .

3 . The next most s ignif icant modif ier or modifying phrase .

The noun or noun phrase es tabl ishes a bas ic concept of an i tem. The modif iers serve to narrow the area of concept es tabl ished by the basic name. A modif ier is separated f rom the noun or noun phrase by a comma and f rom any preceding modif ier by a comma. The type designator and/or any addi t ional modif iers required to fur ther ident i fy an i tem are separated f rom the f i rs t par t of the t i t le by a dash. Where appl icable , the word “ASSEMBLY” shal l be used as the las t word of the noun phrase .

EXAMPLES:

“Beam, Hois t ing, Guided Missi le”

“Cover , Protect ive , Rocket Motor—Forward Sect ion”

“Cabinet , Electr ical Equipment—CY-147”

“Transpor ta t ion—Dolly Assembly, Ear th Satel l i te”

c . The noun, or noun phrase , is never abbreviated. Abbreviat ions are used in the modif iers only when space is l imited. When used, abbreviat ions shal l conform to Abbreviat ions , paragraph 2 .2 on page 12.

d . When one drawing supersedes another , the new drawing, when pract ical , has the same t i t le .

e . Parentheses are not used to enclose any por t ion of the drawing t i t le .

f . Program names (or abbreviat ions) should be added to the “Used On” block and not the Ti t le b lock; except ions are on the f inal or top assembly drawing.

Page 24: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

12 ENGINEERING DRAWING STANDARDS MANUAL

2.2. Abbreviations

The purpose of th is sect ion is to provide a l is t of author ized abbreviat ions for use on drawings and associa ted documents . When used, abbreviat ions and acronyms shal l be in accordance with GSFC STD-256-WE-1 and MIL-STD-12 ( in that order of precedence) .

a . Uppercase Gothic le t ters shal l be used.

b . Abbreviat ions for word combinat ions (e .g . , MMC—Maximum Mater ia l Condit ion) shal l be used as such and shal l not be separated for use s ingly. Single abbreviat ions may be combined when necessary.

c . The same abbreviat ion shal l be used for a l l tenses , the possess ive case and the s ingular and plura l forms of a g iven word.

d . Abbreviat ions should be used only to save space or t ime, but never a t the expense of c lar i ty .

e . Per iods shal l be used with abbreviat ions that spel l ent i re words to provide c lar i ty and to avoid mis interpreta t ion.

The fol lowing abbreviat ions are acceptable to use and are “ industry-re la ted” associa t ions not found in GSFC STD-256-WE-1 or MIL-STD-12.

AFBMA Anti-Fr ic t ion Bear ing Manufacturers Associa t ion, Inc . 1101 Connect icut Avenue, NW Sui te 700 Washington, DC 20036

AGMA American Gear Manufacturers Associa t ion, Inc . 1500 King Street Sui te 201 Arl ington, VA 22314

ANSI American Nat ional Standard Inst i tu te 1430 Broadway New York, NY 10018

ASME American Society of Mechanical Engineers 345 E. 47th Street New York, NY 10017

ASTM American Society for Test ing and Mater ia ls 1916 Race Street Phi ladelphia , PA 19103

Page 25: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 13

AWS American Welding Society , Inc . 550 N.W. Ledeune Road P .O. Box 351040 Miami, FL 33135

IEEE Inst i tu te of Electr ical and Electronic Engineers , Inc . 445 Hose Lane P .O. Box 1331 Piscataway, NJ 08855-1331

ISO Internat ional Organizat ion for Standardizat ion/ (Organisat ion Internat ionale de Normal isat ion) 1 , rue de Varembé 1211 Geneve 20 Switzer land/Suisse

NEMA National Electr ical Manufacturers Associat ion 2101 L Street , NW Washington, DC 20037

NSA Nat ional Standards Associa t ion, Inc . 1200 Quince Orchard Blvd Gai thersburg, MD 20878

NAS Aerospace Industr ies Associa t ion of America , Inc . 1250 I Street , NW Washington, DC 20005

SAE Society of Automotive Engineers , Inc . 400 Commonwealth Drive Warrendale , PA 15096

Page 26: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

14 ENGINEERING DRAWING STANDARDS MANUAL

2.3. List of Material

2.3.1. Requirements on the Body of the Drawing

Each par t l i s ted in the Lis t of Mater ia l (Par ts Lis t ) must be ident i f ied a t leas t once by an I tem (Find) Number on the body of the drawing (except s ingle i tem drawings and shown and opposi te i tem drawings) .

Note:

Par ts shal l be bracketed, indicat ing reference, when they are ident i f ied by number and are not noted in the Lis t of Mater ia l . Such par ts are shown in phantom. Repeated i tem numbers shal l be indicated as reference e i ther wi thin brackets or by the word “REF.”

2.3.2. Requirements in the List of Material

a. The Lis t of Mater ia l is a l is t of a l l par ts and mater ia ls cal led out on the drawing. See Figure 3 on page 10.

b . The quant i ty of par ts noted in the Lis t of Mater ia l i s the number required to complete the noted assembly.

c . When a new drawing is made, a l l par ts in the Lis t of Mater ia l should be grouped as to type, such as dash number ( for shown and opposi te assemblies) , GSFC drawings ( for detai led par ts) , MS par ts , NAS par ts , e tc . , and l is ted in th is sequence.

d . Quant i t ies of Bulk I tems and placement : refer to notes (a) through (e) on Figure 3 on page 10.

e . Preferred par ts l is ts for par ts , mater ia ls , and processes can be found in an unoff ic ia l publ icat ion avai lable for v iewing in the Mechanical Engineer ing Branch. The “Design Select ion Guide” conta ins a wide range of hardware , mater ia ls , des ign s tandards , and processes . I t shal l be noted that not a l l of the i tems in th is reference guide are ra ted for space f l ight use .

Note:

All fas teners used in f l ight hardware and cr i t ica l nuts and bol ts used on ground suppor t equipment , including a l l f l ight /GSE interfaces , must meet the specif icat ion GSFC Fastener In tegri ty Requirements , GSFC S-313-100, Mater ia ls Branch, Off ice of Fl ight Assurance.

Page 27: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 15

2.4. Notes on Drawings

Information other than pic tor ia l v iews and dimensions necessary for complet ing a drawing is c lass i f ied as “notes .” The two types of note forms are General Notes and Local Character Notes . Notes on a drawing take precedence over specif icat ion requirements ; hence, notes conf l ic t ing with referenced specif icat ions shal l not be placed on a drawing unless they are necessary for devia t ions f rom cer ta in provis ions of the specif icat ion.

2.4.1. Security Classification

The secur i ty c lass i f icat ion “Top Secret ,” “Secret ,” or “Confident ia l” shal l be located on the drawing as noted in Figure 1 on page 4 .

Each sheet of a mult isheet drawing shal l be individual ly c lass i f ied as to i t s contents . The secur i ty s tamp on each sheet shal l be that of the highest c lass if ica t ion for any i tem shown on that individual sheet , not the general overal l c lass if icat ion of the ent i re se t of drawings or the end i tem. On rol l -s ize drawings , the secur i ty c lass if icat ion shal l be shown on the reverse s ide a t both ends of the drawings next to the drawing number to enable the c lass if ica t ion to be seen without unrol l ing the drawing.

A warning note shal l be included adjacent to the secur i ty c lass i f icat ion located above the Ti t le block and shal l read as fo l lows:

THIS MATERIAL CONTAINS INFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE LAWS, TITLE 18 U.S.C., SECTIONS 793 AND 794. THE TRANSMISSION OR REVELATION OF WHICH IN ANY MANNER TO AN UNAUTHORIZED PERSON IS PROHIBITED BY LAW.

2.4.2. Note Location

Notes of general character that do not require leaders to indicate where they apply, and for which provis ion has not been made in the supplementary blocks of the drawing format , shal l be located in the fol lowing order of preference:

a . Adjacent to the upper lef t border and to the lef t of a l l v iews.

b . Immediate ly to the lef t of the revis ion block.

c . Adjacent to the lower lef t border or below the revis ion block, space being lef t for extending the revis ion block downward. This locat ion should be avoided whenever pract ical because the space required for revis ions cannot be ant ic ipated.

Page 28: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

16 ENGINEERING DRAWING STANDARDS MANUAL

2.4.3. Numbering of Notes

General notes are numbered consecut ively downward. Note numbers may be ident i f ied on the f ie ld of the drawing by placing the note number in a pennant-shaped f lag a t the general note locat ion and in the f ie ld of the drawing, or in the Lis t of Mater ia l (Mater ia l Specif icat ion column), whichever locat ion is more appropr ia te .

2.4.4. Note Examples

The fol lowing notes are l i s ted as representat ive examples and should be used on Engineer ing Drawings when appl icable .

Signif icant informat ion is to be inser ted where blank(s) are indicated and, for most cases , the nota t ions in parentheses are for information only. (When not appl icable , do not use in note) .

Before us ing the referenced specif icat ions , check the Depar tment of Defense Index of Speci f icat ions and Standards Publ icat ions to ensure that the specif icat ion has not been cancel led or superseded.

Use e i ther of the fol lowing s ta tements as main heading for notes : “Except as noted” or “Unless otherwise specif ied.”

2.4.4.1. Dimension Notes ALL DIMENSIONS APPLY AFTER SURFACE TREATMENT.

DIMENSIONAL LIMITS AND SURFACE ROUGHNESS DESIGNATIONS APPLY (state “BEFORE” or “AFTER”) PLATING. (For other coatings, substitute the appropriate expression for “plating.”)

DIMENSIONS TO APPLY AFTER STRESS RELIEF.

DIMENSIONING AND TOLERANCING TO BE INTERPRETED IN ACCORDANCE WITH ANSI Y14.5M-1982. (Note need be added only when drawings are not in compliance with GSFC X-673-64-1F.)

GEAR TOLERANCES TO BE IN ACCORDANCE WITH AGMA STANDARD QUALITY (insert number) .

DIMENSIONS ARE IN MILLIMETERS.

Page 29: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 17

TOOLING-CONTROLLED DIMENSION PER TEMPLATE (or “TOOL”) NUMBER GX XXXXXXX. THE ACTUAL TOLERANCES ON THE FEATURE'S LOCATIONS ARE CONTROLLED BY THE TEMPLATE. (Note to be flagged to tooling-affected dimensions and tolerances, which are then enclosed in parentheses to indicate a reference; template drawings shall carry a note stating the drawing number of the part they are used to fabricate.)

TORQUE LIMITS FOR THREADED FASTENERS SHALL BE IN ACCORDANCE WITH PROJECT APPROVED SPECIFICATION NUMBER (OR ENGINEERING ANALYSIS).

2.4.4.2. Heat Treating Notes

Note for beryl l ium copper :

HEAT TREAT IN ACCORDANCE WITH MIL-H-7199 TO (Br inel l ) .

Note for s teel :

HEAT TREAT IN ACCORDANCE WITH MIL-H-6875 TO XXX. (XXX = “Rockwell,” “Brinell,” or Vickers”).

Notes for a luminum:

HEAT TREAT IN ACCORDANCE WITH MIL-H-6088 TO (Br inel l ) .

HEAT TREAT TO CONDITION AFTER (insert “BRAZING” or “WELDING”) IN ACCORDANCE WITH MIL-H-6088.

AFTER WELDING, SOLUTION HEAT TREAT AND ARTIFICIALLY AGE TO T-6 CONDITION PER MIL-H-6088.

Page 30: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

18 ENGINEERING DRAWING STANDARDS MANUAL

2.4.4.3. Joining Method Notes (welding, brazing, etc.)

The fol lowing specif ica t ion supersedes MIL-W-8604 for Alum.; MIL-W-8611A for Steel , CRES, and HT RES ALY; and MIL-W-18326 for Magnesium:

FUSION WELD IN ACCORDANCE WITH MIL-STD-2219, PROCESS CLASS USING FILLER METAL AND APPROPRIATE FLUX. (Joint dimension and design should be specified on the drawing.)

ELECTRON BEAM WELDING IN ACCORDANCE WITH MIL-W-46132.

SOLDER IN ACCORDANCE WITH NHB 5300.4(3A–1), USING SOLDER MATERIAL, QQ-S-571, TYPE .

SOLDER IN ACCORDANCE WITH DOD-STD-1866 (GENERAL SOLDERING PROCESS FOR ALL TYPES AND MATERIALS FOR NONELECTRICAL APPLICATIONS).

Note for a luminum:

DIP BRAZE IN ACCORDANCE WITH MIL-STD-645; HEAT TREAT TO CONDITION PER MIL-H-6088.

SILVER SOLDER IN ACCORDANCE WITH MIL-B-7883, TYPE GRADE USING SOLDER MATERIAL QQ-B-654, CLASS .

RIVET IN ACCORDANCE WITH MIL-STD-403.

2.4.4.4. Plating and Coating Notes

Plat ing notes are general ly not for space f l ight hardware use in res t r ic ted areas such as opt ics , e lect ronics , e tc . , due to f laking.

CADMIUM PLATE IN ACCORDANCE WITH QQ-P-416, TYPE CLASS .

HARD CHROME PLATE (size)—(size) THICK PER QQ-C-320, TYPE , CLASS ; DIMENSIONS SHOWN APPLY AFTER PLATING.

NICKEL PLATE IN ACCORDANCE WITH MIL-STD-171, FINISH (para. number) , TYPE .

Page 31: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 19

SILVER PLATE IN ACCORDANCE WITH QQ-S-365, TYPE , GRADE .

PAINT IN ACCORDANCE WITH MIL-STD-171, TABLE ; FINISH NO. COLOR IN ACCORDANCE WITH FED-STD-595 (color number) .

Notes for a luminum:

ANODIZE IN ACCORDANCE WITH MIL-A-8625, TYPE , CLASS COLOR (name of color only ) .

IRIDITE IN ACCORDANCE WITH MIL-C-5541, CLASS .

Note for CRES:

PASSIVATE PER QQ-P-35, TYPE .

FINISH OF MIL-STD-171. Use paragraph that applies to material being used.

Note for i ron and s teel :

APPLY PROTECTIVE PHOSPHATE COATING IN ACCORDANCE WITH MIL-C-12968, TYPE . (Add “CLASS ”if applicable.)

Note for t i tanium:

SURFACE FINISH TO BE IN ACCORDANCE WITH AMS 2488, TYPE .

2.4.4.5. Surface Preparation Notes SURFACE TO BE CLEANED AND POLISHED FOR VACUUM USE. DO NOT USE ROUGE COMPOUNDS OR CHEMICALS DURING BUFFING OR POLISHING ON ITEMS REQUIRING TANK-TYPE LEAK TESTS. EXTERNAL SURFACE TO BE BUFFED TO .

BEFORE ELECTROPOLISHING, MASK ALL SURFACES MARKED .

Page 32: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

20 ENGINEERING DRAWING STANDARDS MANUAL

VAPOR DEGREASING PER ASTM D4126, GENERAL SOLVENT GRADE 1,1,1 TRICHLOROETHANE.

2.4.4.6. Testing and Inspection Notes THIS PART SHALL HAVE A LEAK RATE OF NOT MORE THAN (1 x 10-7 CC/SEC OF HELIUM) WHEN MEASURED BY A CALIBRATED MASS SPECTROMETER HAVING A SENSITIVITY OF (1 x 10-9 CC/SEC WITH GREATER THAN 90% HELIUM) AT A DIFFERENTIAL OF (ONE) ATMOSPHERE OR EQUIVALENT TEST.

RADIOGRAPHIC INSPECTION OF ALL WELDS IN ACCORDANCE WITH MIL-STD-00453.

ULTRASONIC INSPECTION PER MIL-STD-2154, TYPE (Insert “I” or “II”) , CLASS . (I = Immersion Method, II = Contact Method.)

For General Fracture Control Plan for Payloads Using the Space Transportat ion System (STS) , refer to GSFC 731-0005-83. One of the fol lowing notes should be used for par ts requir ing e tching and/or l iquid penetrant inspect ion:

FRACTURE CRITICAL PART - ETCH AND PENETRANT INSPECT PER GSFC S-313-009, CODE XXXXX. (Usually used for machined parts.)

FRACTURE CRITICAL PART - DO NOT ETCH PART. PENETRANT INSPECT PER GSFC S-313-009, CODE XXXXX. (Usually used for rolled parts.)

I f areas of a par t are to be e tched and inspected pr ior to f in ish machining, a separate drawing note should cal l out th is requirement to avoid cost ly mis takes .

2.4.4.7. Threaded Inserts — Cleaning and Installation Notes

Note for a luminum and magnet ic surfaces:

CLEAN THREADED INSERTS WITH TRICHLOROETHANE AND BAKE OUT AT 100 DEGREES CELSIUS FOR 3 TO 4 HOURS PRIOR TO INSTALLATION. APPLY DRY FILM LUBRICANT GOVT. DESIGNATION M-6003, TYPE (insert “I” or “II”) PER MIL-L-46010 QPL (LIST). (Type I cure temp. = 150 degrees C.) (Type II cure temp. = 240 degrees C.)

Page 33: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 21

INSTALL THREADED INSERTS PER XXX. (XXX = “MS33537” for coil type, “MS51835” for Keen type, or “MIL-I-45932/1” for thin wall type.)

INSTALL CLINCH NUTS PER MIL-N-45938/1.

AFTER THE BONDING EPOXY IS CURED PER NOTE , ALL ITEM (insert number) THREADED INSERTS SHALL BE CAPABLE OF WITHSTANDING A CORRESPONDING TORQUE LOAD, AS LISTED IN TORQUE TABLE, WITHOUT BECOMING LOOSE. ALL THREADS ON THREADED FASTENERS SHALL BE FREE OF ADHESIVE AND FOREIGN MATERIAL.

TORQUE TABLE THREAD SIZE TORQUE, IN-LBS

6-32 UNC x.x . . . . . . . . . . . .

TAP ALL HOLES PRIOR TO COATING; INSTALL THREADED INSERT AFTER COATING.

2.4.4.8. Miscellaneous Notes PLACE IN BAG AFTER FINAL ELECTROPOLISHING. BAG SHALL CONFORM TO MIL-P-116, METHOD (see spec.) .

ALTERED PART SOURCE INFORMATION: PART NO.: VENDOR: ADDRESS:

MAINTAIN AS MATCHED SET AFTER MACHINING.

Note for NON-fl ight par ts ONLY:

STEEL STAMP, ETCH, OR ENGRAVE (s ize) HIGH

CHARACTER AS SHOWN, X .010 +.005 - .000 DEEP.

THIS DRAWING TO BE INTERPRETED IN ACCORDANCE WITH GSFC X-673-64-1F.

RUBBER STAMP (s ize) HIGH CHARACTER AS SHOWN, USING ( insert “ INK” or “PAINT”) IN ACCORDANCE WITH (speci f icat ion *) . (* Include manufacturer's part number and address.)

Page 34: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

22 ENGINEERING DRAWING STANDARDS MANUAL

BAG PART PER MIL-P-116, METHOD , AND TAG WITH PART NUMBER.”

ALTERED SURFACES TO HAVE .

(Refer to paragraph 10.4.1, page 93, for symbol notation.)

FINISH ALL OVER. (Refer to paragraph 10.4.1, page 93, for symbol notation.)

SURFACE ROUGHNESS AS XXX:

MACHINED SURFACES . (where XXX is “ROLLED,” “EXTRUDED,” or “DRAWN”). (Refer to paragraph 10.4.1, page 93, for symbol notation.)

INSIDE CORNERS R MAXIMUM.

UNIT TO BE STRAIGHTENED AND STRESS-RELIEVED AFTER WELDING.

WELDED OR BRAZED FILLETS TO BE CONFINED TO INSIDE SURFACE.

TWINE SHALL CONFORM TO THE REQUIREMENTS OF MIL-T-713, TYPE , CLASS .

A MANUFACTURER'S CERTIFICATION OF MATERIAL SPECIFICATION COMPLIANCE MUST BE SUPPLIED WITH PART (insert number) .

MAGNETIC SPECIFICATION--PERMEABILITY OF LESS THAN (specify units) .

COMPONENTS MUST BE PACKAGED AND MARKED IN ACCORDANCE WITH APPLICABLE INTERSTATE COMMERCE COMMISSION (ICC) REGULATION 49-CFR71-78; SHIPMENT SHALL BE MADE DIRECTLY TO THE USING AGENCY. EXPLOSIVE (or other applicable wording) COMPONENTS ARE HAZARDOUS AND MUST BE HANDLED IN ACCORDANCE WITH APPLICABLE SAFETY REGULATION 49-CFR71-78.

Page 35: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 23

2.4.4.9. Informational Notes

Informational notes , such as the fol lowing government r ights to manufacture note , shal l appear adjacent to the r ight border and Ti t le b lock of the drawing:

THE XXXX COMPANY, CHICAGO, IL. , PART NUMBER XXXX CORRESPONDS TO THE ITEM DEPICTED ON THIS DRAWING, WHICH IS FURNISHED FOR UNRESTRICTED USE IN CONNECTION WITH ANY U.S. GOVERNMENT MANUFACTURE OR PROCUREMENT. SUCH USE IS AUTHORIZED BY THE XXX COMPANY LETTER NO. XXX SIGNED AND DATED . NO OTHER USE IS AUTHORIZED.

2.4.5. Local Character Notes

Notes of local character , such as dr i l l notes , thread notes , e tc . , that require leaders to indicate the features to which they apply, shal l be located in the f ie ld of the drawing in posi t ions adjacent to such features . Each note shal l s ta te the number of features to which i t appl ies unless a leader is drawn to each feature .

2.4.6. General Dimensional Tolerance Notes

The general to lerances entered in the supplementary por t ion of the Ti t le b lock shal l control a l l d imensions appl ied to the drawing, except those specif ical ly labeled “Max,” “Min,” “Ref ,” “Datum,” or “Basic ,” or d imensions having to lerances appl ied direct ly thereto , or d imensions control led by notes or documents invoked on the drawing. General to lerances may be changed to the prevalent to lerances that are required by the drawing type. This is done by s t r ik ing through the to lerance and inser t ing the new tolerance beneath the old . In the case where metr ic to lerancing is required, see Sect ion 10.2 , subparagraph i , for general to lerances .

2.5. Specification Callouts

Normally, only the bas ic document number of a specif ica t ion should be shown on the drawing, in which case, the la tes t issue in effect a t the t ime of invi ta t ion to bid shal l be imposed in a l l procurement act ions . Changes to the specif icat ion occurr ing subsequent to the t ime of invi ta t ion to bid shal l not be imposed in current procurement act ions unless the drawing is revised to show the new issue by basic document number , revis ions , amendment , and/or date and current pro-curement act ions amended to specify the new drawing revis ion or Engineer ing Order (EO).

Page 36: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

24 ENGINEERING DRAWING STANDARDS MANUAL

I f the bas ic document number , revis ion, amendment , and/or date of a specif icat ion are shown on a drawing, only that par t icular issue shal l be imposed in a l l procurement act ions . Changes to the specif icat ion occurr ing subsequent to the t ime of invi ta t ion to bid shal l not be imposed in e i ther current or fu ture procurement act ions unless the drawing is revised to show the new issue by basic document number , revis ion, amendment , and/or date and current procurement act ions amended to specify the new drawing revis ion or EO.

Regardless of whether a specif icat ion is shown on the drawing by basic document number only or by a par t icular issue , superseding specif ica t ions (new number) shal l not be imposed in e i ther current or future procurement act ions unless the drawing is revised to show the new basic document number and, i f appl icable , issue and current procurement act ions amended to specify the new drawing revis ion or EO.

Page 37: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 25

3. DRAFTING PRACTICES

3.1. General

These draf t ing pract ices are to be employed in the preparat ion of drawings by GSFC personnel to achieve commonal i ty throughout and resul t in legible reproduct ions a t the leas t cost f rom or ig inal drawings .

Drawings must be complete and unambiguous in in terpreta t ion. Complete drawings conta in or make reference to a l l data necessary for fabr icat ing and ins ta l l ing the par t and, when appl icable , the necessary tes t requirements , procurement requirements , and source .

Third-angle or thographic project ion shal l be used for mechanical engineer ing drawings . (Cer ta in diagrams, schematics , e tc . , a re excepted. ) Although other types of project ion, such as isometr ic , perspect ive , e tc . , a re not prohibi ted, their use must be conf ined to an auxi l iary v iew on a drawing of a complex par t when such a view shal l a id in visual iz ing the par t .

Drawings need not have three views, ( i .e . , one or two views are permiss ible for objects that can be completely def ined) . Complementary notes or d imensions are acceptable in place of the addi t ional views. The rule shal l be that only those views shal l be drawn that are necessary to convey the required character is t ics of the par t . Views, d imensions , e tc . , shal l not extend in to the margins of the drawing.

3.2. Lines

Acceptable qual i ty of reproduct ions is dependent on the densi ty and uniformity of l ine work (and le t ter ing) . Types of l ines descr ibed herein are merely l ine conven-t ions , but in every case , each type of l ine shal l be opaque and of uniform width and shal l be used on a l l drawings other than diagrams, such as schemat ics , e tc .

3.2.1. Ink Lines and Plotted Lines

Lines , whether hand-drawn or p lot ted , shal l be opaque and of uniform width for each type of l ine . Two widths of l ines , i .e . , th in and th ick, with their widths in the propor t ions of 1 :2 , shal l be used. The actual width of each type of l ine shal l be governed by the s ize and s tyle of the drawing; the re la t ive widths of the l ines shal l approximate those shown in Figure 4 on page 26.

Page 38: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

26 ENGINEERING DRAWING STANDARDS MANUAL

Figure 4: L ine Types and Convent ions

Page 39: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 27

3.2.2. Pencil Lines

Penci l l ines shal l be opaque and of uniform width throughout their length .

The l ine widths which are specif ied for ink l ines do not apply to penci l l ines . Cut t ing and viewing plane l ines are the th ickest l ines on the drawing. However , the th ick l ines used for out l ines and other v is ib le l ines shal l be suff ic ient ly prominent to immediately dif ferent ia te them from l ines used for o ther purposes . Hidden, sect ioning, center , phantom, extension, d imension, and leader l ines shal l be th inner than out l ines . In select ing the widths of penci l l ines , considerat ion shal l be given to the medium of reproduct ion involved to ensure proper reproduct ion and reduct ion of the th inner l ines .

3.2.3. Types of Lines

3.2.3.1. Center Lines

Center l ines shal l be composed of long and shor t dashes , a l ternate ly and evenly spaced, wi th a long dash a t each end. Center l ines shal l cross without voids . See Figure 5 , below, and Figure 6 , page 28.

Figure 5: L ine Convent ions

Very shor t center l ines may be unbroken i f there is no confusion with o ther l ines . Center l ines shal l a lso be used to indicate the t ravel of a center . See Figure 6 on page 28.

Page 40: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

28 ENGINEERING DRAWING STANDARDS MANUAL

Figure 6: Al ternate Posi t ion

3.2.3.2. Dimension Lines

Dimension l ines shal l terminate in arrowheads a t each end. They shal l be unbroken except where space is required for the dimension. The proper method of showing dimensions and to lerances is expla ined in Sect ion 1 .7 of ANSI Y14.5M-1982.

3.2.3.3. Leaders

Leaders shal l be used to indicate a par t or por t ion to which a number , note , or o ther reference appl ies and shal l be an unbroken l ine terminat ing in an arrowhead, dot , or wavy l ine . Arrowheads should a lways terminate a t a l ine; dots should be wi thin the out l ine of an object .

3.2.3.4. Break Lines

Short breaks shal l be indicated by sol id f reehand l ines . For long breaks , fu l l ru led l ines with f reehand zigzags shal l be used. Shaf ts , rods , tubes , e tc . , which have a por t ion of their length broken out , shal l have the ends of the break drawn as indicated in Figure 7 on page 29.

Page 41: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 29

Figure 7: Break Lines

3.2.3.5. Phantom Lines

Phantom l ines shal l be used to indicate the a l ternate posi t ion of par ts of the i tem del ineated, repeated detai l , or the re la t ive posi t ion of an absent par t and shal l be composed of a l ternat ing one long and two shor t dashes , evenly spaced, wi th a long dash a t each end. See Figure 5 on page 27, Figure 6 on page 28, and Figure 8 , below.

Figure 8: Repeated Detai l

3.2.3.6. Sectioning Lines

Sect ioning l ines shal l be used to indicate the exposed surfaces of an object in a sect ional v iew. They are general ly th in fu l l l ines , but may vary with the kind of mater ia l shown in sect ion.

Page 42: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

30 ENGINEERING DRAWING STANDARDS MANUAL

3.2.3.7. Extension Lines

Extension l ines are used to indicate the extension of a surface or to point to a locat ion outs ide the par t out l ine . They s tar t wi th a shor t , v is ib le gap from the out l ine of the par t and are usual ly perpendicular to their associa ted dimension l ines .

3.2.3.8. Hidden Lines

Hidden l ines shal l consis t of shor t dashes , evenly spaced. These l ines are used to show the hidden features of a par t . They shal l a lways begin with a dash in contact wi th the l ine f rom which they begin , except when such a dash would form a cont inuat ion of a fu l l l ine . Dashes shal l touch a t corners , and arcs shal l begin with dashes on the tangent points . See Figure 5 on page 27 and Figure 8 on page 29.

3.2.3.9. Stitch Lines

Sti tch l ines shal l be used to indicate the s t i tching or sewing l ines on an ar t ic le and shal l consis t of a ser ies of very shor t dashes , approximately half the length of dash or h idden l ines , evenly spaced. Long l ines of s t i tching may be indicated by a ser ies of s t i tch l ines connected by phantom l ines .

3.2.3.10. Outlines or Visible Lines

The out l ine or v is ib le l ine shal l be used for a l l l ines on the drawing represent ing vis ible l ines on the object ; see Figure 5 on page 27.

3.2.3.11. Datum Lines

Datum l ines shal l be used to indicate the posi t ion of a datum plane and shal l consis t of one long dash and two shor t dashes , evenly spaced.

3.2.3.12. Cutting-Plane/Viewing-Plane Lines

The cut t ing-plane l ines shal l be used to indicate a plane or planes in which a sect ion is taken. The viewing-plane l ines shal l be used to indicate the plane or planes f rom which a surface or surfaces are viewed. On s imple views, the cut t ing planes shal l be indicated as shown in Figure 9 on page 31. View shal l be shown in back of the cut t ing plane (3rd angle) .

Page 43: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 31

Figure 9: Ful l Sect ional View

On complex views, or when the cut t ing planes are bent or offse t , the cut t ing planes shal l be indicated as shown in Figure 10.

Figure 10: Offset Sect ions

Page 44: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

32 ENGINEERING DRAWING STANDARDS MANUAL

3.3. Lettering and Numerals

All le t ter ing shal l be uppercase (capi ta l le t ters) . Numbers shal l be Arabic numerals . The le t ter ing and numerals shal l a lwyas be placed in a hor izontal reading posi t ion as far as pract icable . Other than th is , le t ter ing shal l be in a hor izonta l reading posi t ion when the drawing is ro ta ted 90° c lockwise . Legible le t ter ing is essent ia l for reproduct ions . Let ters and/or numerals shal l not run together .

When typewri t ten le t ters or d igi ts are used on drawings or re la ted data , nothing smal ler than pica type is permit ted .

3.3.1. Style

Other than being uppercase Roman and placed in a hor izontal reading posi t ion, the le t ter ing is that of the individual 's s tyle .

3.3.2. Heights

Letter ing heights shal l be as fo l lows:

Drawing Feature: Let ter ing height in

inches Drawing number in ident i f ica t ion blocks .25 Drawing t i t le and descr ipt ion of drawing type above L/M .25 Drawing subt i t le , border , le t ters , and numerals .19 Sect ion, detai l , v iew, and tabula t ion le t ters .25 Descr ip t ion t i t les of sect ion, deta i l , v iew, notes , and tabula t ions .19 Dimensions , to lerances , l imits , notes , subt i t les , tables , revis ion, and zone le t ters on the f ie ld of the drawing .16 Lis t of mater ia ls information, name blocks , used on, and next assy

.14

Note: Use of f i t text is not a l lowed.

3.4. Scale

Drawings shal l be made to ful l scale unless the par ts (or assembly) are too large to permit i t or so smal l and complex that drawing to an enlarged scale is essent ia l for c lar i ty . When the main views of large par ts are drawn to a reduced scale , the detai l v iews “ taken” to c lar i fy detai l should be made to ful l scale whenever poss ible . When the par t has been drawn to an enlarged scale for c lar i ty , i t i s not necessary to make an actual-s ize view.

a . The scales preferred for engineer ing drawings are ful l s ize 1/1 , reduced 1/2 , 1 /4 , 1 /10, 1 /20, and enlarged 2/1 , 4 /1 , 10/1 , 20/1 . The computer data base for the format s ize shal l be 1/1 a t a l l t imes.

Page 45: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 33

EXCEPTION:

Cer ta in drawings or f igures , by their very nature , cannot be drawn to a specif ic scale ( for example , wir ing and schematic d iagram drawings . ) The scale designat ion for these cases is “NONE.” See “b,” below.

b . The scale , as noted above, or the word “NONE” must be entered in the Ti t le b lock. Do not use the word “SIZE” fol lowing the ra t io . The nota t ions “1/4 & NOTED” or “1/2 & NOTED,” e tc . , apply to those drawings on which the main views are to a reduced scale and auxi l iary v iews are to some other scale .

c . To maintain consis tency with t i t le b lock cal lout for scale , detai l v iews shal l be noted thus:

DETAIL - A SCALE 1 /1

Note:

The scale of the view shal l be s ta ted only when i t d i f fers f rom that noted in the Ti t le b lock, which represents the major i ty of v iews and sect ions .

d . Original penci l drawings should be to scale with in 0 .03 inch. When changes to an exis t ing drawing take place, i t i s required to indicate that a par t icular feature is not to scale by under l in ing the dimensions with a s t ra ight l ine .

e . The geometry of CAD-produced drawings shal l be entered in to the e lectronic database a t one- to-one ( ful l ) scale .

3.5. Positioning the Part on the Drawing

Ins ta l la t ions shal l usual ly be posi t ioned on the drawing as they would be seen when viewed f rom the lef t s ide or top s ide of the equipment with i ts forward end point ing to the lef t .

I f c lar i ty can be great ly improved by a posi t ion that resul ts in fewer hidden l ines and foreshor tened project ions , then that posi t ion should be used, and the above rule should be disregarded. Such ins tances would be a door or door jamb which ins ta l ls on the r ight s ide being drawn with the forward por t ion to the r ight , or a number of i tems ins ta l led on the forward s ide of a panel being drawn looking a t the forward s ide .

Par ts and minor assemblies are not necessar i ly drawn in the posi t ion they assume in the equipment . They may be drawn with some surface, s ide , or reference l ine paral le l or perpendicular to the lower border of the drawing. Lathe- turned par ts are usual ly drawn with the larger diameters to the lef t .

3.5.1. Picturization

Unnecessary detai l shal l be omit ted f rom al l v iews and sect ions i f c lar i ty is not sacr i f iced and i f draf t ing t ime is reduced. See Figure 11 on page 34.

Page 46: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

34 ENGINEERING DRAWING STANDARDS MANUAL

Figure 11: Detai ls of Auxi l iary

3.5.2. Sections

a. A sect ional v iew shal l be made through an outs ide view and not through another sect ional v iew. See Figure 12 on page 35.

b . The locat ion of a sect ion is indicated by a cut t ing plane with reference le t ters and arrowheads showing the direct ion in which the sect ion is v iewed.

c . Sect ional v iews shal l not project d i rect ly ahead of the cut t ing-plane arrowheads and should be as near as pract icable to the por t ions of the drawing that they c lar i fy.

d . The axes of sect ional v iews should not be rota ted; however , the cut t ing plane may vary in direct ion (see Figure 12) . I f v iews have to be rotated, the angle and direct ion of rota t ion must be given.

e . Vis ible and invis ible out l ines beyond the cut t ing plane should not be shown unless necessary for c lar i f ica t ion.

f . Shaf ts , bol ts , nuts , e tc . , which are in a cut t ing plane should not be cross-hatched.

Page 47: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 35

CORRECT BUT NOT INLINE OF PROJECTION

NOT RECOMMENDEDSECTION ROTATEDXX° CW

INCORRECT PROJECTIONWRONG SIDE OF CUTTINGPLANENOT ACCEPTABLE

CORRECT BUT NOT INLINE OF PROJECTION

SECTION A-A

A

A

Figure 12: Designat ion and Posi t ioning of Sect ional Views

g. The cross-hatching symbol for cas t i ron should be used regardless of mater ia l as shown in Figure 13. I f essent ia l for c lar i ty , mater ia l f rom which the par ts are made should be indicated by the convent ions given in ANSI Y14.2M-1979.

CAST OR MALLEABLE

IRON AND GENERAL USE

FOR ALL MATERIALS

Figure 13: Convent ions for Mater ia l

h. When sect ions are remotely located, zone informat ion shal l be added to both locat ions ( i .e . , f rom where the sect ion is taken and to the locat ion where the sect ion is shown) .

Page 48: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

36 ENGINEERING DRAWING STANDARDS MANUAL

3.5.3. Views

A view is used to enlarge or c lar i fy a por t ion of the drawing. See Figure 14.

SEE VIEW

A

A

A-ASCALE 2/1

1D

SH1

5

A

D

1

SH3

5A

(TITLE BLOCK

NOT SHOWN)

Figure 14: Clar i f icat ion of a Port ion of a Drawing

a. Projected views which are shown along common center l ines to their or ig in need not be ident i f ied . Views located direct ly ahead of viewing plane arrowheads are absolutely prohibi ted .

b . “Transpor ted” views or sect ions are those which are not d irect project ions . They must be ident i f ied where shown, by le t ters , and at their or ig in by the cut t ing plane l ines and le t ters .

c . Views should not be rota ted; however , i f v iews have to be ro ta ted for a legi t imate reason, the angle and direct ion of ro ta t ion must be given.

Page 49: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 37

3.5.4. Details

A detai l is a par t ia l v iew which shows a por t ion of another v iew in the same plane and wil l usual ly depict greater detai l . Detai ls should not be rota ted. See Figure 15.

DETAIL ASCALE 4/1

SEE DETAIL A

Figure 15: Ident i f icat ion of Detai ls

3.5.5. Identification of Sections, Views, and Details

a. Ident i fying le t ters for sect ions , v iews, and detai ls are ass igned in a lphabet ical sequence as fol lows: For sect ions and such views as “A-A” in Figure 14 on page 36, use hyphenated le t ters . After “Z-Z,” begin: “AA-AA,” “AB-AB,” e tc .

b . For encirc led detai ls such as detai l “A” in Figure 15, use s ingle le t ters . After “Z,” begin: “AA,” “AB,” e tc .

c . The le t ters “I ,” “O,” “Q,” and “X,” e i ther as a s ingle le t ter or as double- le t ter entr ies , shal l not be used. A designated le t ter or combinat ion of le t ters on a re leased drawing shal l not be used for another sect ion, v iew, or detai l on the same drawing.

Page 50: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

38 ENGINEERING DRAWING STANDARDS MANUAL

3.5.6. Locating Sections, Views, and Details

On zoned and/or mult isheet drawings, a v iew, sect ion, or deta i l and the por t ion of the drawing i t c lar i f ies shal l be cross-referenced as fo l lows:

Reference on Original Drawing to View on Clar i fying Sheet

Reference a t View on Clar i fying Sheet to Original Drawing

SEE VIEW A-A 5ASH3

VIEW A-ASCALE 4/1

1DSH1

Note: Zone block s ize is 1 /2- inch square .

Page 51: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 39

4. TYPES OF DRAWINGS

4.1. Altered or Selected Vendor Part Drawing

Altered vendor par t or se lected vendor par t drawings shal l be prepared on GSFC format when an exis t ing vendor par t cannot be used as is and i t is des ired to document and control the a l tera t ion or se lect ion of the par t . Preparat ion shal l not be in i t ia ted unt i l the vendor has been requested to make the a l tera t ion or se lect ion, supply his number , and supply documentat ion. When the drawing is prepared by GSFC, i t shal l specify the par t to be a l tered or se lected by vendor number , name, and address and shal l completely del ineate the a l tera t ion or select ion. In addi t ion, the drawing shal l specify re ident i f icat ion of the par t by the GSFC par t number . An a l tered or se lected vendor par t drawing shal l be ident i f ied by the words “Altered Vendor Par t Drawing” immediate ly above the Ti t le b lock. See Figure 16.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALTERED PART SOURCE INFORMATION;PART NO: 118-R-0715 RELAYVENDOR; LEACH CORP.ADDRESS; LOS ANGELES, CALIF.

ALTERED VENDOR PART DRAWINGSEE NOTE 2

(REIDENTIFY THEPART TO GSFC PART

ø .218 +-

.006

.000-1 HOLE

ENLARGE EXISTING

AT THIS LOCATION ONLYø .166 HOLE

2. INK STAMP PART NUMBERPER ..........SUGESTED SOURCE OF SUPPLY (INK).............................................

NUMBER GCXXXXXXX.)

REV

REV

DATE APPROVAL

FOLD

LIN

EG

C

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LIN

E

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQ'DREQ'D

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

Figure 16: Sample Al tered or Selected Vendor Part Drawing

Page 52: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

40 ENGINEERING DRAWING STANDARDS MANUAL

4.2. Assembly Drawing

An assembly drawing shows two or more separable par ts jo ined to form a s tockable i tem, or a group of assemblies required to form an assembly of h igher order . Figure 17 shows an example of an assembly drawing when a separate par ts l is t is required. Figure 34, “Assembly Drawing With Lis t of Mater ia l ,” on page 80, shows an assembly drawing with the Lis t of Mater ia l on the drawing. Refer a lso to Sect ion 5 .1 , “Par t Numbering,” on page 61.

MS15795-30510

9 MS35234-17

11 MS35649-44

MS35649-638

GXXXXXX11

7 MS15795-305

2GXXXXXX5

GXXXXXX63

GXXXXXX34

GXXXXXX45

GXXXXXX26

2X

2X

2X

4X

2X

REV

REV

DATE APPROVAL

FOLD

LIN

EG

C

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LIN

E

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQ'DREQ'D

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

Figure 17: Sample Assembly Drawing

Page 53: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 41

4.3. Detail Drawing

A detai l drawing shows al l the informat ion necessary for fabr icat ing an i tem, including the mater ia l f rom which i t is made and those f in ishes , protect ive coat ings , and processes required to fabricate the end product . Only one i tem (deta i l par t ) shal l be presented per drawing. See Figure 18.

1.120

.750

1.000

NOTES: UNLESS OTHERWISE SPECIFIED

.500O

2.250

1.500

1. IRIDITE IN ACCORDANCE WITH

MIL-C-5541. CLASS1A.

RUBBER STAMP .125 HIGH CHARACTERS

AS SHOWN USING ____________.

2

ORIGINAL SOURCE OF SUPPLY:

INSERT COMPLETE

_________

ADDRESS_________

BAR AL ALY QQ-A-225/8 6061-T6

REV

REV

DATE APPROVAL

FOLD

LINE

GC

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LINE

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQ'DREQ'D

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

Figure 18: Sample Detai l Drawing

In the case of inseparable par ts (such as those that are welded, r iveted, bonded, or brazed, e tc . ) which form an integral uni t (par t ) not capable of being disassembled for replacement , refer to paragraph 4 .6 ent i t led “Inseparable Assembly Drawing” on page 44.

Mult idetai l drawings are not a l lowed. The GSFC requires a unique drawing number per par t so that each par t can be individual ly es t imated by fabr icators and ident i f ied for inspect ion and conf igurat ion t racking.

Page 54: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

42 ENGINEERING DRAWING STANDARDS MANUAL

4.4. Drawing Tree

A drawing t ree is used to control the development of drawings and their p lace in the overal l scheme of the project . Although th is type drawing is not a requirement for each project , when used proper ly and kept up to date , i t can be a valuable management a id and can be conta ined in a conf igurat ion management database . See Figure 19.

TOP ASSYCONFIGURATION DWG

GE -XXXXXXX

2456000

4,5

CGJ

MODULE-APAYLOAD

2456050 AGF

AVIONICS ASSY

2456042 -GE

ENCODER BOX

2456070 -GD

BRACKET, CONNECTOR

2456010

1

-GE

DUAL BRACKET ASSY

2456789GD

BRACKET, DUAL

2456273GC

SPRING, EXTERNAL

2456272GC

SPRING, DETENT

ELECTRICAL

GJ -2450200

GE 2456290

DUAL HINGE

-

TBD

INTERFACECONTROL DWGS

* - AGJ

DRAWINGSINSTALLATION

UV SENSOR INSTL

GD D2452250

2452100

INSTALLATIONSOLAR ARRAY BATTERY

2452200GE -

2

7

-

SLING

24550362GF

CABLE, HOIST

GD 2450365

LIFTING FIXTURE

GE A2450360

STAND, MOUNTING

GE C2450351

FRAME, WELDING

GE -2450350

DOLLY ASSY

GJ -2450330

GROUND HANDLINGEQUIPMENT

GE -2450300

-

BGC 2450424

WASHER

AUTOCAD DRAWINGDRAWING SIZEDRAWING NUMBER PRE-ASSIGNEDDRAWING NUMBERMULTI-USE DRAWINGDRAWING REVISION LETTER

TO BE DETERMINED

LIST OUTSTANDING EO NOS.

***

-

TBD

TYPICAL SYMBOL LIST

**

3

Figure 19: Sample Drawing Tree

Page 55: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 43

4.5. Electrical/Electronic Drawings

Electr ical /e lectronic drawings are prepared to depic t schematics , wir ing diagrams, cable in terconnect ions , and detai led cable assembly drawings.

4.5.1. Electrical and Electronic Symbols

Applicat ion: Symbols shal l be in accordance wi th ANSI Y32.2-1975, Graphic Symbols for Electr ical and Electronic Diagrams (or la ter revis ions) , unless o therwise noted.

Graphic e lectr ical wir ing symbols for archi tectural and electr ical layout drawings shal l conform to ANSI Y32.9-1972, Graphic Symbols for Electr ical Wir ing and Layout Diagrams Used in Archi tecture and Build ing Construct ion (or la ter revis ions) .

4.5.2. Electrical and Electronic Diagrams

Applicat ion: Diagrams shal l be in accordance wi th ANSI Y14.15-1966 (R-73) Electr ical and Electronic Diagrams (or la ter revis ions) ; ANSI Y14.15a-1971, Interconnect ion Diagrams , subsect ion 15-11; ANSI Y14.15b-1973, Electr ical and Electronics Diagrams , subsect ions 15-1 through 15-10, and 15-12.

Page 56: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

44 ENGINEERING DRAWING STANDARDS MANUAL

4.6. Inseparable Assembly Drawing

An inseparable assembly drawing del ineates i tems (pieces) which are separate ly fabr icated and are permanent ly jo ined together (e .g . , welded, brazed, r iveted, nai led , bonded, e tc . ) to form an in tegral uni t (par t ) not capable of being readi ly disassembled. An inseparable assembly drawing may be prepared in l ieu of individual monodetai l drawings for inseparable assemblies in tended to be procured and replaced as a uni t , where (except for s tandard hardware) the separate par ts are of s imilar or compat ib le mater ia ls . See Figure 20 (a l l data , such as notes and l is t of mater ia l , are not shown).

.750

1.000

.250 TYP

R .125

.063

1.000

GXXXXXX2 1

.8751.250

1.960 .063

MS20426-X3

MS33588-X2

4.000

3.500 .250

.063ø .125+

-.006.0002X

REV

REV

DATE APPROVAL

FOLD

LIN

EG

C

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LIN

E

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQ'DREQ'D

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

Figure 20: Sample Inseparable Assembly Drawing

An inseparable assembly drawing shal l fu l ly def ine the end product or detai l assembly as assembled. Pieces of the inseparable assembly may be detai led e i ther on separate detai l drawings or on the inseparable assembly drawing i tse lf . In the case of weldments , the par ts shal l not be individual ly detai led on separate drawings (due to the consumable mater ia l a l lowances that would have to be shown on deta i l drawings) , except in cases where extensive machining might be necessary.

Page 57: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 45

4.7. Installation Assembly Drawing

An ins ta l la t ion assembly drawing shows where and how par ts and/or assemblies are ins ta l led re la t ive to support ing s t ructure or associa ted i tems. I t shows locat ing dimensions , to lerancing, specif ies a t taching par ts (such as r ivets , bol ts , or screws) and specif ic adjustments , assembly ins t ruct ions , and processes required for complet ing and inspect ing the ins ta l la t ion. Figure 21 shows an example when a separate par ts l is t is required.

REV

REV

DATE APPROVAL

FOLD

LIN

EG

C

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LIN

E

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQ'DREQ'D

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

.000

.004-+.250ø

6.000ø

4.300ø

GXXXXX12

GXXXXX10

GXXXXX139

3

.625

1.150

GXXXXXX11

GXXXXXX82

GXXXXXX46

(GXXXXXX9)

ø .5002 X

GXXXXXX57

GXXXXXX68

GXXXXX1111

1.000

1.812

2.500

1.380

GXXXXXX35

4 GXXXXXX2

(PEEN ENDS)

10

Figure 21: Sample Instal lat ion Assembly Drawing

a. That por t ion of the s t ructure in to which the insta l la t ion is being insta l led shal l be shown in phantom and ident i f ied by i ts par t number . Such ident i f ica t ions shal l be indicated as reference information by enclosure of the par t number in parentheses or by use of the symbol “REF.”

b . Applicable datum points or p lanes , such as center l ines of s t ructure , p lane of symmetry, s ta t ion planes , e tc . , shal l be shown and ident i f ied .

c . Par ts may be deta i led in place on ins ta l la t ion drawings when convenient .

Page 58: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

46 ENGINEERING DRAWING STANDARDS MANUAL

4.8. Interface Control Drawing

An interface control drawing shal l be used to mainta in compat ibi l i ty of a l l physical and funct ional designs between different engineer ing design act iv i t ies . The drawing shal l communicate des ign cr i ter ia such as dimensions , hole and/or bol t s izes , hardware, and ul t imate changes re la t ive to cofunct ioning systems. “Interface Control Drawing” shal l be added direct ly above the Ti t le block. No l is t of mater ia ls is permit ted on th is type of drawing; i t i s not to be used to manufacture par ts . See Figures 22a, below, and 22b on page 48.

23.250

15.500

7.750

3.000

6.000

9.00012.000

24.000

+Y

+Z

12 x ø.281± .004.000

ø.007

23°-30'+Y

PLATFORM #5REF

VIEW LOOKING OUTBOARD

INTERFACE CONTROL DRAWING

NOTES: UNLESS OTHERWISE SPECIFIED

7.000

A-ASECTION

-A-

A A

M A B C

1.500

.375

1 SUPPLIED BY XZ CORP.

2 THIS DRAWING IS NOT TOBE USED FOR FABRICATIONOR INSPECTION.

1

-C-

-B-

CONTROL BOX #5

REV

REV

DATE APPROVAL

FOLD

LIN

EG

C

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LIN

E

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQ'DREQ'D

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

BOSS, CT 0613212 WATERLANE

Figure 22a: Sample Inter face Control Drawing

Page 59: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 47

4.00

FO

R P

ALL

ET

AN

D R

OLL

ER

S

WL

140.

00 C

5A

9.56

2 ATT

EN. F

R.

Z 30

0.76

REF

43.5

26

6.93

SPA

CER

75.9

149.

388

ADAP

TER

5.00

Z 40

0

REM

OVABL

E

SU

PPO

RT

STR

UT

68.5

24IN

CLU

DIN

G

CO

VER

S

WL

302.

00 C

5A

4.00

55.1

62

Z 41

4

TUR

NO

VER

AXI

S

31.8

39

MM

S

R 1

01.4

31 Ø19

0.00

65.2

39

52.9

14

TRUN

NIO

N

CO

VER

36.3

614.

39

NO

TE 1LO

AD

CELLJAC

KSPA

CER

SLO

TTED

1.00

104.

314

FOR

TU

RNO

VER

MO

TIO

N (S

HO

WN

)

105.

314

FOR

TU

RNO

VER

EQ

UIP

MEN

T IN

STA

LLAT

ION

102.

314

FOR

STA

TIC

SU

PPO

RT

ON

PO

STS

46.8

3

48.0

0

69.7

549

.013

HIN

GE

PO

INT

7.00

1.5

17.3

75

47.9

0246

.83

2.07

2

UAR

INTU

RN

OVER

C5A

SH

IPPIN

GC

ON

FIG

UR

ATI

ON

SIDE V

IEW

NO

TES:

UN

LESS O

THER

WIS

E SPEC

IFIE

D1.

SU

PPO

RT

PO

STS

FO

LD A

WAY F

OR

TU

RN

OVE

R

AN

D R

EM

OVE F

OR S

HIP

PIN

G.

Z414

16.1

7

1.0

11.1

7M

PF

G C

LIST

OF

MATE

RIA

L

NATI

ON

AL A

ER

ON

AUTI

CS

AND

SPA

CE

AD

MIN

ISTR

ATI

ON

REQ

D

TOLE

RAN

CES

:

FLIG

HT

HAR

DW

ARE

NEXT

ASSY

HAR

DN

ESS

TEST

NO

T R

EQ

UIR

ED

ON F

IELD

OF

DRAW

ING

TH

US

ND

E R

EQ

UIR

ED P

ER

S-3

13-0

09 C

OD

E

TEST

HAR

DN

ESS

PER

ASTM

E-1

8, L

OC

ATIO

N O

PTI

ONAL

TEST

HAR

DN

ESS

PER

ASTM

E-1

8 W

HERE IN

DIC

ATED

NO

NO

N-D

ESTR

UC

TIVE E

XAM

INATI

ON (N

DE) R

EQ

'D

REM

OVE

ALL

BU

RR

S AN

D S

HAR

P ED

GES

R .0

10 O

R C

HAM

FER

MAX

.

UN

LESS

OTH

ERW

ISE S

PEC

IFIE

D-D

IMEN

SIO

NS

AR

E IN

INC

HES

FILE

NAM

E:

SO

FTW

AR

E:

VER

SIO

N:

FOLD

LINE

THIS

DR

AW

ING

WAS

PR

OD

UC

ED U

SIN

G

.XX

ITEM NO

.

USED O

N

APPR

OVE

D-S

TRESS

APPR

OVE

D-E

NG

INEE

R

NO

N F

LIG

HT

FRAC

TIO

NS

±1/1

6

PAR

T N

O.

.XXX

DES

IGN

ER

DR

AWN

CH

ECKED

APPR

OVE

D

APPR

OVE

D

125

NAM

E

DES

CR

IPTI

ON

GR

EEN

BELT

, MAR

YLAN

D

DR

AWIN

G IN

TER

PRETE

D P

ER G

SFC

-X67

3-64

-1

SCALE

CO

DE

WT

SH

God

dard

Spa

ce F

light

Cen

ter

TITL

E

INIT

DATE

MATE

RIA

LM

ATER

IAL

SPEC

& N

O.

REV

SYM

LINE

FOLDREV

APP

RO

VAL

DESC

RIP

TIO

ND

ATE

REV

ISIO

N

G C

±.02

±.00

5±1

°

/PO

ST F

AB H

ARD

NESS

TEST

REQ

'D

INTE

RFA

CE C

ONTR

OL

DR

AWIN

G

POSIT

ION

REQ

D

Page 60: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

48 ENGINEERING DRAWING STANDARDS MANUAL

Figure 22b: Sample Inter face Control Drawing Note: Format is too smal l . No informat ion should appear beneath revis ion block

or above l is t of mater ia l . Choose a larger format in th is case.

4.9. Matched-Set Drawing

A matched-set drawing depic ts par ts that are machine-matched or o therwise mated and for which replacement as a matched set or pair i s essent ia l . The operat ing or mat ing character is t ics of the matched par ts (se t ) shal l be indicated. The par ts shal l be uniquely marked with a ser ia l number ident i f ica t ion to indicate a matched se t . See Figure 23 (a l l data required for the f in ished drawing are not shown).

The drawing t i t le becomes an assembly, a l though the par ts are not actual ly a t tached. “Maintain and Furnish Only As A Matched Set” shal l be added direct ly above the Ti t le block or Lis t of Mater ia l .

REV

REV

DATE APPROVAL

FOLD

LIN

EG

C

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LIN

E

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQDREQD

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

3 GXXXXXX3

GXXXXXX22

1 GXXXXXX1

LAP .00008 TO .00015

DIAMETRAL CLEARANCE

MAINTAIN AND FURNISH ONLY AS A MATCHED SET

Figure 23: Sample Matched-Set Drawing

Page 61: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 49

4.10. Mechanical Schematic

A mechanical schematic d iagram drawing i l lus t ra tes the operat ional sequence or arrangement of a mechanical device . Dimensions and re la t ive s izes of i tems may be shown to indicate mechanical re la t ionship . See Figure 24.

Page 62: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

50 ENGINEERING DRAWING STANDARDS MANUAL

NO

TES: U

NLE

SS O

THER

WIS

E S

PECIF

IED

BAL

LIST

ICCO

RR

ECTI

ON

DIF

FERRENTI

AL

36T

32P

90T

32P

62T

53T

LINE

LOCK

25

L

08

R

68

AM

MUNIT

ION S

ELE

CTI

ON K

NO

B(9

1 REVS

.

005)

REVE

RSE

CAM

180T 20

T

GEA

R S

EG

MENT

66T

84665

L0G

R

BAL

LIST

IC C

AM

TRANSM

ITTE

R

SUPE

R-

ELE

VAT

ION

DIF

FERENTI

AL

44T88

T

26T 44

T

72T

32P 32

P

32P

66T

51T

66T

CO

UPLI

NG

MST

66P

24T

64P

64P

34T

60T

64P

1. 2.

ALL

DIR

EC

TIO

NAL

AR

RO

WS IN

DIC

ATE

ALL

GEAR

S 4

6P.

INC

REASE IN

SU

PERELE

VATI

ON

.

24TP

I LH

QUADRUPLE

ENTR

YDO

UBL

E

24TP

I RH

VER

TICAL

DEFL

ECTI

ON

MIR

RO

R

RANG

E SCAL

E

GUN L

AYIN

G R

ETIC

LE

21T

24T

20T

32P

53T

32P

102T

(SPI

DER

)

44T

45T

24T 36

T64

T

24T

72T

27T

72T

27T 13

5T 20T

CO

MPE

NSAT

OR

24TR

I

DO

UBLE

THD R

H

L08

RG

EARS

21T

32P

105T 32P

72T

90T

(80R

EVS-

.005

)BAL

CO

RR K

NO

B

8525

L

0G

R

LINE

LOCK

RAN

GE

KNO

B(2

065

REVS

.0

05)

STO

P

CO

UPLI

NG

72T

72T

AZI

MUTH

BO

MBS

IGHT

KNO

B(6

MLS

/REV

) 150

REV

ELE

VAT

ION B

OM

BSIG

HT

KNO

B(6

ML/

REV

)

LIST

OF

MAT

ERIA

L

NAT

ION

AL A

ER

ON

AUTI

CS A

ND

SPA

CE

AD

MIN

ISTR

ATIO

N

REQ

'D

HAR

DNESS

TEST

NO

T REQ

UIR

ED

TOLE

RANCES:

FLIG

HT

HAR

DW

AR

E

ON

FIE

LD O

F D

RAW

ING

TH

US

ND

E R

EQ

UIR

ED

PER

S-3

13-0

09 C

OD

E

TEST

HAR

DN

ESS

PER A

STM

E-1

8, L

OC

ATI

ON

OPTI

ON

AL

TEST

HAR

DN

ESS

PER A

STM

E-1

8 W

HER

E IN

DIC

ATE

D

NO

NO

N-D

ESTR

UC

TIVE

EXA

MIN

ATIO

N (N

DE)

REQ

'D

REM

OVE

ALL

BU

RR

S AND

SH

ARP E

DG

ES

R .0

10 O

R C

HAM

FER

MAX

.

UN

LESS

OTH

ER

WIS

E SP

ECIF

IED

-DIM

ENSI

ON

S AR

E IN

INC

HES

FILE

NAM

E:

LINE

FOLD

THIS

DR

AWIN

G W

AS P

RO

DU

CED

USIN

G

SOFT

WARE:

VER

SIO

N:

.XX

NO

.

ITEM

APP

RO

VED

-EN

GIN

EER

USE

D O

NN

EXT

ASSY

NO

N F

LIG

HT

FRAC

TIO

NS

.1/1

6

PAR

T N

O.

.XXX

REQ

'D

DR

AW

N

APP

RO

VED

APP

RO

VED

APP

RO

VED

-STR

ESS

CH

EC

KED

DESI

GN

ER

125

NAM

E

DES

CR

IPTI

ON

GR

EEN

BELT

, MAR

YLAN

D

DR

AW

ING

INTE

RPR

ETED

PER G

SFC

-X67

3-64

-1

SCALE

CO

DE

WT

SH

God

dard

Spa

ce F

light

Cen

ter

TITL

E

INIT

DATE

MATE

RIA

LM

ATER

IAL

SPEC

& N

O.

REV

SYM

G CREV

FOLD

LINE

APP

RO

VAL

DESC

RIP

TIO

ND

ATE

REV

ISIO

N

G C

.02

.005

.1

/PO

ST F

AB H

ARD

NES

S T

EST

REQ

'D

Figure 24: Sample Mechanical Schemat ic

Page 63: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 51

4.11. Modification Drawing

Modif icat ion drawings del ineate changes to del ivered i tems, s tockable i tems (e .g . , Standard Par t Drawing of honeycomb panel b lanks) , assemblies , ins ta l la t ions , or sys tems. Drawings are prepared to add, remove, or rework i tems, equipment ins ta l la t ions , or systems to sat isfy the using act iv i ty 's requirements . They also incorporate mandatory changes (e .g . , safety , re l iabi l i ty , or appl icat ion extension) in del ivered equipment . A modif icat ion drawing shal l be ident i f ied by the words “Modif icat ion Drawing” immediate ly above the Ti t le block. This type of drawing has a lso been known or referred to as a “Make From Drawing.”

4.12. Outline Drawing

An out l ine drawing is a drawing that def ines the external contour of an i tem, usual ly by showing the projected views in two or three perpendicular p lanes . Two types of out l ine drawings are depic ted in Figures 25a, below, and 25b on page 52.

APPROX 3M SPACECRAFT AND TELESCOPE PAM-A15M MAXIMUM

SECTION 3M

STAR TRACKER

DATA ANTENNA

APPROX 1M DIA

OUTLINE OF SHUTTLE

TELESCOPE

PAYLOAD ENVELOPE

DATA ANTENNA

SOLAR ARRAY STOWED

SUN SHADE SHOWN STOWED

ATTITUDE CONTROLTHRUSTERS

APOGEE ROCKETMOTORS

STOWED IN SHUTTLE BAY FOR PAM-A LAUNCH

Figure 25a: First Sample Out l ine Drawing

Page 64: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

52 ENGINEERING DRAWING STANDARDS MANUAL

SHUTTLE TRANSPORTATION SYSTEM

PAYLOADINSTALLATIONSATELLITE

COBE

576.00584.00

760.50

943.50

1123.50

217.22

SPACECRAFT LENGTH1108.33

1069.00

1307.001305.50

96.68

SOLAR ARRAY PANELS

207.06

186.00

+X Looking aft

+Y

+Z Looking out ofthe plane of paper

-Y

Figure 25b: Second Sample Out l ine Drawing

Page 65: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 53

4.13. Source Control Drawing

A source control drawing shal l be used to l imit procurement of a vendor-designed and manufactured par t (or assembly) to that source or sources that exclusively provide the performance, ins ta l la t ion, and interchangeable character is t ics of the par t se lected and tes ted for a specif ic appl icat ion. In the event the vendor shal l not provide drawings as descr ibed in paragraph 4 .14.d on page 56, the source control drawing shal l include the same descr ipt ion of the par t as required on specif icat ion control drawings . I f vendor drawings are made avai lable , the content of the source control drawing shal l be l imited to vendor 's par t number , name, and address . In e i ther case , the fol lowing note shal l appear on the source control drawing: “Only the par t(s) specif ied on th is drawing and ident i f ied by vendor 's name(s) , address(es) , and par t number(s) has (have) been tes ted and approved by GSFC for use in name of i tem. A subst i tu te par t shal l not be used without pr ior tes t ing and approval by GSFC.” See Figure 26.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ONLY THE PART SPECIFIED ON THIS DRAWING ANDIDENTIFIED BY VENDOR'S NAME, ADDRESS AND PARTNUMBER HAS BEEN TESTED AND APPROVED BY GSFCFOR USE IN MODEL XYZ. A SUBSTITUTE PART SHALLNOT BE USED WITHOUT PRIOR TESTING AND APPROVALBY GSFC.

2. APPROVED SOURCE:

JONES MFG. CO., STREET ADDRESS, CHICAGO, IL PART NUMBER XX3-X4XX

SOURCE CONTROL DRAWING

REV

REV

DATE APPROVAL

FOLD

LIN

EG

C

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LIN

E

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQDREQD

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

Figure 26: Sample Source Control Drawing

a. The source control drawing number is not a par t number . The vendor par t i tse lf shal l be ident i f ied by the vendor 's ident i fying number .

Page 66: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

54 ENGINEERING DRAWING STANDARDS MANUAL

b. The assembly (or ins ta l la t ion) drawing shal l ca l l out the par t by source control drawing number . In the Lis t of Mater ia l (par ts l is t ) of the drawing, the source control drawing number shal l be accompanied by the fol lowing note: “Vendor Par t—see source control drawing.” A source control drawing shal l be ident i f ied by the words “Source Control Drawing” immediate ly above the Ti t le b lock.

c . A source control drawing shal l not upgrade a vendor 's par t beyond the vendor 's s t ipula t ions .

4.14. Specification Control Drawing

Specif icat ion control drawings are prepared to record the character is t ics of a vendor-designed and manufactured par t (or assembly) . This type of drawing may also be used to document GSFC par ts that are sent to a unique vendor to perform a specif ic operat ion because of specia l equipment and/or hardware only avai lable there . Such character is t ics are s ize , shape, mounting dimensions , and other des ign requirements , including tes ts , when appl icable , that could be obta ined f rom the vendor 's manufactur ing drawings i f they were made avai lable . The vendor 's par t number , name, and address shal l be included, e i ther in note or table form. See Figure 27.

Page 67: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 55

REV

REV

DATE APPROVAL

FOLD

LIN

EG

C

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LIN

E

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQDREQD

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

1.250

ø2X .020

.438-20 UNF-3BFOR .25 OD TUBINGPER AND 100503 PLACES

PORT 1

PORT 3

PORT 2

1.190

2.380

WITH PORT 3PLUGGED APPLYPRESSURE ASFOLLOWS

PERMISSIBLE LEAKAGEAT RATE OF

INTERNAL EXTERNAL

5 PSI ATPORT 2

2250 PSIAT PORT 2

5 PSI ATPORT 1

2250 PSIAT PORT 1

1 DROP PER HRAT PORT 1

NONEAT PORT 1

1 DROP PER HRAT PORT 1

NONEAT POR 2

NONE

NONE

NONE

NONE

THESE TESTSDOWN DURINGSHOULD BE HELDPORT 1

PORT 2SHOULD BE HELDDOWN DURINGTHESE TESTS

COMMENTS

PRODUCTION TEST PROCEDURE

BE SURE THATSEALING POPPETIS LOOSE INVALVE WHEN

IS APPLIEDPRESSUREEACH TEST

VENDOR NAME & ADDRESS

BUFFALO. N.Y.SMITH ENGINEERING COMPANY

XA3-X29XX

VENDOR PART NO.

SPECIFICATION CONTROL DRAWING

3X

Figure 27: Sample Speci f icat ion Control Drawing

a. The specif ica t ion control drawing number is not a par t number . The vendor par t i tse lf shal l be ident i f ied by the vendor 's ident i fying number .

b . The assembly (or ins ta l la t ion) drawing shal l cal l out the par t by the specif ica t ion control drawing number . In the Lis t of Mater ia l (par ts l is t ) of the drawing, the specif icat ion control drawing number shal l be accompanied by the note “Vendor Par t—see specif icat ion control drawing.” A specif icat ion control drawing shal l be ident i f ied by the words “Specif ica t ion Control Drawing” immediate ly above the Ti t le block.

c . A specif icat ion control drawing does not prevent procurement f rom mult ip le sources when the vendor par t has been determined to be equivalent to o ther vendor par ts by the Federal Cataloging Program, resul t ing in Federal I tem Ident i f ica t ion Number (FIIN) number ass ignment or when the par t is manufactured by a l icensee of the vendor .

Page 68: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

56 ENGINEERING DRAWING STANDARDS MANUAL

d. The preparat ion of specif ica t ion control drawings can be avoided by procur ing the vendor 's manufactur ing drawings . In the event the vendor c la ims propr ie tary r ights and refuses to provide his manufactur ing drawings , he shal l be requested to furnish an out l ine drawing of h is par t suff ic ient to include the requirements s ta ted above. When the vendor provides e i ther type of drawings ( i .e . , manufactur ing drawings or an out l ine drawing) , the par t number cal lout on the drawing shal l be by the vendor 's number .

e . A specif ica t ion control drawing shal l not upgrade a vendor 's par t beyond the vendor 's s t ipula t ions .

4.15. Standard Part Drawing

Standard par ts shal l be se lected f rom government and industry s tandards in that order of precedence. I f nei ther of these contain a par t sa t is factory for the design needs , a drawing shal l be prepared. Before preparat ion, i t must be determined that the par t shal l be a GSFC standard par t , in which case i t shal l be draf ted on GSFC s tandard manual format .

4.16. Tabulated Drawing

A tabulated drawing depic ts s imilar i tems with di f ferences in character is t ics such as dimensions , mater ia l , f in ish , and other requirements . These dif ferences are tabula ted on the drawing, the f ixed character is t ics depicted once.

Pic tor ia l d if ferences that are not c lear should be shown in views or detai ls and should be proper ly labeled. A tabula ted drawing precludes the preparat ion of an individual drawing for each i tem. See Figure 28.

Page 69: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 57

B

A

1.375

1.250

DIM. B

3.625

3.500

DIM. A

GCXXXXXX5-3

GCXXXXXX5-1

PART NO.

.020 Aø.953

ø1.360

2X R .31

2X R .31

.003 A

A.020

ø3.265

ø3.95

PASSIVATE PER QQ-P-35, TYPE II

BAG PART PER MIL-P-116, METHOD III,AND TAG WITH PART NUMBER GC1234567.

UNLESS OTHERWISE SPECIFIED

1.

2.

NOTES:

TABLE I

BAR CRES ASTM A582 /303 COND A

A

REV

REV

DATE APPROVAL

FOLD

LIN

EG

C12

3456

7

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LIN

E

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQDREQD

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

1234567

COUPLER

Figure 28: Sample Tabulated Drawing

4.17. Tooling Drawing

Tooling f ix tures and templates are product ion a ids . The templates are not in tended as engineer ing documentat ion of the f inal end i tem conf igurat ion.

The engineer ing drawing for which a Tooling drawing is being produced shal l carry the fol lowing note :

THESE FEATURES ARE TO BE INSTALLED USING TOOLING TEMPLATE GX-XXXXXXX ONLY. THE ACTUAL TOLERANCES ON THE FEATURES LOCATIONS ARE CONTROLLED BY THE TEMPLATE.

When affected by tool ing, d imensions and their to lerances shal l be f lagged on the engineer ing drawing to the above note and enclosed in parentheses to indicate reference informat ion only.

Page 70: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

58 ENGINEERING DRAWING STANDARDS MANUAL

The fol lowing note shal l be added to the tool ing drawing:

THIS TOOLING IS USED TO FABRICATE PIECE PART GX-XXXXXXX.

The tool ing drawing shal l be dimensioned the same way as the engineer ing drawing.

4.18. Composite Material Drawing

A composi te mater ia l drawing is an engineer ing representat ion of two or more mater ia ls in combinat ion (re inforcing f ibers and res in binder) . The f iber and res in dif fer in form or composi t ion, and are ta i lored to meet specif ic engineer ing propert ies . The drawing shal l specify the mult i -p ly laminate conf igurat ion that def ines the number of p l ies , the s tacking sequence, the ply angle or ienta t ion, the prepreg f iber-res in mater ia ls , and the physical d imensions .

For the fol lowing requirements , refer to Figure 29 as an example of a composi te mater ia l drawing.

a . A coordinate reference and angle direct ion shal l be shown for both the par t and the s tacked deta i l .

b . Each ply shal l be ident i f ied by I tem No. , angle , and th ickness , as shown in Table 1 of Figure 29.

c . Dash numbers may be used to show var ia t ions , such as length and mater ia l , as shown in Table 2 of Figure 29.

d . Stacking sequence code (+30/0/-30/90)2 S , as shown in Table 1 in Figure 29 def ines the fol lowing features :

Ply 1 +30-degree or ienta t ion Ply 2 0-degree or ienta t ion Ply 3 -30-degree or ienta t ion Ply 4 +90-degree or ienta t ion Subscr ip t “ 2” indicates repeat sequence (pl ies 1–4) two

t imes , for bui ld up of p l ies 5–8. Subscr ip t “ S” indicates symmetry, i .e . , p l ies 1–8 repeated in

reverse order for bui ldup of p l ies 9–16.

The code is read (+30/0/-30/90/+30/0/-30/90/90/-30/0/+30/90/-30/0/+30) .

Examples of o ther var ia t ions to the code are (03 /90 2 /45/-45 3) S . This code is read (0/0/0/90/90/+45/-45/-45/-45/-45/-45/-45/+45/90/90/0/0/0) .

In the same example , the subscr ipt “T” can be used in l ieu of “S” to designate the to ta l laminate . For example, (03 /90 2 /45/-45 6 /45/90 2 /0 3) T . However , in th is example , us ing the “S” to denote symmetry is the preferred method. “T” is general ly reserved for laminates where symmetry is not specif ied, as in (0 /30/60/90) T .

Page 71: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 59

Figure 29: Composi te Mater ia l Drawing Example

Page 72: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

60 ENGINEERING DRAWING STANDARDS MANUAL

5. NUMBERING SYSTEM FOR DRAWINGS AND SUPPORTING DOCUMENTATION

The GSFC numbering system for ident i fying engineer ing drawings and associa ted l is ts is based on the “uni t number” pr inciple , whereby the same basic number ass igned to an assembly drawing is a lso appl ied to index, usage, data , and par ts l i s ts .

a . Drawing numbers shal l consis t of ass igned basic seven-digi t numbers , pref ixed by the le t ter “G” (s ignifying GSFC) and a second le t ter s ignifying the drawing s ize (B, C, D, E, F , or J ) .

b . Associa ted l is t numbers shal l be the basic seven-digi t drawing number pref ix wi th PL or IL as appl icable . Refer to Def ini t ions paragraph 8 .1 on page 71.

c . All GSFC organizat ions us ing drawing numbers shal l make their request to the Mechanical Systems Divis ion, Mechanical Engineer ing Branch (des ignated custodian) for b locks of numbers for their f l ight hardware and ground suppor t equipment .

d . The management of drawing numbers becomes the responsibi l i ty of the engineer ing design group to whom they are ass igned. Reass ignment of the numbers to group subsect ions or individuals , o ther contractors or subcontractors , or o ther programs or projects must be control led, recorded, and maintained by the Configurat ion Management Off icer .

e . Engineer ing documentat ion (drawings, engineer ing change orders , and conf igurat ion change requests) shal l be re ta ined by the Configurat ion Manager in the responsible engineer ing organizat ion unt i l o therwise directed by the Project .

f . When i t i s necessary to ident i fy a drawing as a sketch, the number shal l be ass igned by the or ig inator . The sketch shal l be maintained by the or ig inator to prevent the necess i ty of a centra l control . Sketches shal l not be prepared in place of engineer ing drawings for procurement of mockups, models , preproduct ion hardware or f l ight hardware , and associa ted equipment .

g . GSFC numbers for specif icat ions , processes , and s tandards shal l be issued by the specif ic organizat ion for which such documents are being developed. Procedures governing the preparat ion of GSFC specif icat ions , processes , and s tandards shal l be in accordance wi th GSFC-S-250-3, Guide for the Preparat ion of Speci f icat ions . The Library Services Branch of the GSFC Informat ion Management Divis ion shal l receive two copies of f inal , approved documents that are of general in teres t and use . A l is t of exis t ing specif icat ions is maintained by the Library Services Branch.

Page 73: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 61

h. In the absence of a project-directed document numbering plan, the fol lowing system shal l be used:

revision letterordinal specification number issued in given year

year of specification issueBranch, Division or organization issuing & maintaining specification

"S" for specification, "P" for procedureGoddard Space Flight Center

GSFC - S - 722 - 93 - 002 - A

5.1. Part Numbering

Each deta i l par t , subassembly, e tc . , shal l be ident i f ied by a par t number as fo l lows:

a . An i tem covered by an approved s tandard and used without a l tera t ion or select ion shal l be ident i f ied by the proper s tandard number (such as MS number for mil i tary s tandard) , which shal l include any dash number or code necessary for complete ident i ty .

b . Each nonstandard i tem shal l be ident i f ied by a par t number that shal l be , or shal l include, the drawing number .

c . Vendor-designed and manufactured par ts or assemblies shal l be ident i f ied by the vendor 's par t number . See “Specif icat ion Control Drawing,” paragraph 4 .14 on page 54, and “Source Control Drawing,” paragraph 4 .13 on page 53.

d . Altered or se lected par ts shal l be ident i f ied as required. See “Altered or Selected Vendor Par t Drawing,” paragraph 4 .1 on page 39.

e . Symmetr ical ly opposi te par ts shal l be des ignated by -1 (shown) and -2 (opposi te) carrying the odd/even re la t ionship to higher numbers as necessary. The par t shown shal l a lways be an odd number , and i ts opposi te , the next h igher number .

Par ts shal l be ident i f ied on the f ie ld of drawing by showing both the ident i fying par t number and f ind number where cross-referenced on a separate Engineer ing Par ts Lis t . See “Sample Assembly Drawing,” Figure 17 on page 40. When the par ts appear in the Lis t of Mater ia l on the drawing, only the i tem number is ca l led out on the f ie ld of the drawing. See Figure 34, “Sample Assembly Drawing With Lis t of Mater ia l ,” on page 80.

A detai l drawing depic ts a s ingle detai l par t , and the par t shal l be des ignated by the drawing number . See “Detai l Drawing,” paragraph 4 .3 on page 41.

An inseparable assembly drawing depicts par ts permanent ly fas tened together , and the assembly shal l be des ignated by the drawing number . The individual par ts shal l be des ignated by par t number as descr ibed per “Inseparable Assembly Drawing,” paragraph 4 .6 on page 44.

Page 74: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

62 ENGINEERING DRAWING STANDARDS MANUAL

Each of the par ts shown on a tabula ted drawing shal l be ident i f ied by the drawing number suff ixed with a dash number . The basic drawing number a lone shal l not be used to ident i fy a par t . See “Tabulated Drawing,” paragraph 4 .16 on page 56.

Par ts that must be mated, and for which replacement as a matched set or pair i s required, shal l be ass igned a s ingle number to designate each matched set or pair . Component par ts shown in matched-set drawings ins tead of separate detai l drawings shal l be ident i f ied by the ident i fying par t number and f ind number . See “Matched-Set Drawing,” paragraph 4 .9 on page 48.

5.2. Find or Item Numbering

Under the f ind or i tem numbering system, a number is ass igned to a par t or detai l assembly for the purpose of locat ing i t in the f ie ld of the assembly drawing. The f ind or i tem number is a lso shown in the Engineer ing Par ts Lis t for an assembly drawing, cross-referenced to the par t number used for procurement purposes .

5.3. Order of Precedence of Specifications and Standards

When ident ical par ts or assemblies of equal qual i ty are ident i f ied by more than one document , the i tem shal l be referenced on drawings in the fol lowing order :

5.3.1. Group I

Group I covers government specif ica t ions and s tandards l is ted for use by GSFC and industry documents coordinated to the extent indicated as fol lows in (c) and (e) .

a . Coordinated federal specif icat ions and s tandards .

b . Coordinated mil i tary specif icat ions and s tandards ( including JANs, ANs, and ANDs) .

c . Industry specif icat ions and s tandards (e .g . , those promulgated by nat ional ly recognized associat ions , commit tees , and technical socie t ies) having coordinated s ta tus es tabl ished under pol ic ies and procedures of o ther government agencies and approved for GSFC use .

d . Limited coordinat ion mil i tary and in ter im federal specif icat ions and s tandards issued by other government agencies and approved for GSFC use .

e . Industry specif icat ions and s tandards having l imited coordinat ion s ta tus es tabl ished under pol ic ies and procedures of o ther government agencies and approved for GSFC use .

5.3.2. Group II

Group I I covers industry specif ica t ions and s tandards (e .g . , those promulgated by nat ional ly recognized associat ions , commit tees , and technical socie t ies) approved for use by GSFC, for which s ta tus equivalent to mil i tary documents has not been es tabl ished.

Page 75: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 63

5.3.3. Group III

Group I I I covers Government specif icat ions and s tandards not previously l is ted by GSFC.

5.3.4. Group IV

Group IV covers industry specif ica t ions and s tandards not previously l is ted for use by GSFC. Company specif icat ions and s tandards are not to be considered as a par t of th is group. Copies of industry specif ica t ions and s tandards should be obta ined f rom the associa t ion concerned.

5.3.5. Group V

Group V covers company specif icat ions and s tandards . Reference to a company specif icat ion or s tandard for new appl icat ions or des igns shal l be discont inued upon the issuance of a specif icat ion or s tandard in Group I , I I , I I I , or IV cover ing an in terchangeable i tem of equivalent qual i ty .

Note (appl icable to Groups I , I I , IV, and V above) :

When industry specif icat ions and s tandards are specif ied on GSFC drawings and documents , such specif icat ions and s tandards shal l be avai lable to GSFC personnel .

Page 76: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

64 ENGINEERING DRAWING STANDARDS MANUAL

6. ENGINEERING ORDER

6.1. General Requirements

The use of Engineer ing Order (EO) for the purpose of revis ing re leased drawings is the preferred method of changing drawings , a l though the method of d irect change to the drawing may be chosen by the project engineer .

After an EO system is e lected, i t i s the responsibi l i ty of that project design act iv i ty to ass ign numbering and maintain the documentat ion system. The approved EO is considered an off ic ia l par t of the or ig inal drawing and shal l a lways be avai lable to o thers , even af ter incorporat ion. With th is system, reference to EOs in the revis ion block of drawings is permit ted in place of the usual detai led l is t ing of changes .

6.2. Format Sample

The fol lowing minimum information should be included on an EO form. See Figure 30a on page 66.

1 . DRAWING & REV. LEVEL: The number of the drawing to be changed and the revis ion level affected. Where the change is exact ly the same on more than one drawing, add an as ter isk to the drawing and revis ion level b lock; then add the drawing numbers a long with the next appl icable EO number to the as ter isk table on the f ie ld of change on EO page 1 . I f more than one EO page is required, the addi t ional EO pages wil l only note that those pages affect the l is t of drawings the EO is wri t ten against .

2 . INC. REV.: The revis ion le t ter to be provided by the Configurat ion Manager (CM) at the t ime of drawing change incorporat ion. Outs tanding EO numbers may be incorporated under one revis ion le t ter .

3 . TITLE: Ti t le of the drawing to be revised.

4 . NEXT ASSEMBLY: Next assembly number of the drawings affected by the change.

5 . USED ON: The type of equipment such as Ground-Support Equipment (GSE) or Fl ight (FLT).

6 . PROGRAM: Name of program.

7 . REASON: Reason why the change is necessary ra ther than descr ipt ion of the change. A Configurat ion Change Request (CCR) number and class to be provided by the project engineer where appl icable or when required by the CM.

8 . TYPE OF EO:

Advance Notice of Change : A change to the drawing that shal l take place a t some future date . Several EOs may be incorporated under the same revis ion le t ter .

Page 77: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 65

Deviat ion : A record of a change to a manufactured par t . The change is to accept a discrepancy correct ion in a par t . The EO would be ass igned a back s lash ( \ ) ins tead of an EO revis ion let ter and ident i f ied as a “Deviat ion for ser ia l number ” in the revis ion block. No physical change to the f ie ld of the drawing wil l occur .

Other : A record of specia l tes ts or c i rcumstances that might not be required of a l l par ts .

9 . DESCRIPTION: Descr ipt ion of the change to be made shal l be shown using the words “Was” and “Now” or “Remove” and “Add.” The words “Delete ,” “Cancel led” or “Superseded” may also be used. In the s i tuat ion of superseding a previous EO, a “Was” and “Now” current condi t ion must a lso be shown, jus t as i f the previous EO had been incorporated.

I f the current EO format is insuff ic ient in s ize , a sheet 2 or more may be added (see Figure 30b) . I f a larger page is required a supplemental sheet shal l be prepared on a regular drawing-s ize sheet reproducible vel lum and shal l s ta te “This supplemental sheet is page of EO number of drawing number .” Enter in the descr ipt ion area of page 1 of the EO to “see supplemental sheet page of th is EO.”

The EO must be on an approved EO form. No paste ons or l ine s t r ikeouts are permit ted . Al l le t ter ing must be .12 inch or larger and uniform in s ize .

10. “SHEET OF ” : Indicate number 1 and the to ta l number of EO sheets . On remaining sheets , enter the number of that par t icular sheet of the EO only.

11. Disposi t ion: Act ions to be taken as a resul t of the change.

12. EFFECTIVE: I f the change affects only a l imited number of a ser ies of l ike par ts , f i l l in the ser ia l number(s) and date . iF THE CHANGE

13. DRAWN BY: Signature , date , and GSFC CODE.

14. ISSUED BY: Signature , date , and GSFC code of CM off ic ia l .

15. CHECKED: Signatures , date , and GSFC codes . When pract icable , s ignatures should be those of persons who approved the or ig inal drawing.

16. APPROVED: sIGNATURE, DATE, AND Signature , date , and GSFC CODE.

17. ENGINEER: Signature , date , and GSFC CODE of project responsible engineer .

18. CCB APPROVAL: Configurat ion control board s ignature .

19. JOB ORDER NO: Fabr icat ion number to be ass igned by the cognizant engineer .code

20. EO NO: To be ass igned by the conf igurat ion management off ice or the designated representat ive for the program for which the EO is being wri t ten . EO numbers are issued in numerical sequence against a par t icular drawing number when the EO is sent for checking.

Page 78: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

66 ENGINEERING DRAWING STANDARDS MANUAL

EODRAWING & REV LEVEL

SHEET

ISSUED BY CMO

GSFC CODE LOCATION DATE

1. DRAWING TITLE

5. TYPE OF EO:ADVANCED NOTICE OF CHANGEDrawing will be revised

DEVIATIONDrawing will not

OTHER (Explain)

DATE

SERIAL

EFFECTIVE7.

8. DESCRIPTION

ENGINEERING ORDERGODDARD SPACE FLIGHT CENTER

GREENBELT,MARYLANDOF

be revised

CCB APPROVAL3a .

JOB ORDER NO..3b

4.

DISPOSITION RW

K

ASUSE

IS SC

RAP

NO

PAR

TS

RAW MATERIAL

PART IN PROCESS

6. PROGRAM

USED ON

NEXT ASSY

10. DRAWN BY CHECKED: APPROVED: APPROVED: ENGINEERING:

DATE CODE CODEDATE CODEDATE CODEDATE CODEDATE

MAD

E

REASON2.

INC REVEO NO.

3 8 9 7 19 18 1 10 20 2

14

12

6

5

4

171611 13 15

Figure 30a: Engineer ing Order (sheet 1)

EOENGINEERING ORDER

GODDARD SPACE FLIGHT CENTER

GREENBELT,MARYLANDOF

DRAWING & REV LEVEL EO NO. INC REV

SHEET

Figure 30b: Engineer ing Order (sheet 2)

Page 79: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 67

Page 80: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

68 ENGINEERING DRAWING STANDARDS MANUAL

7. DRAWING REVISIONS

7.1. Revision Methods

Revis ions in the f ie ld of drawings are made by delet ion, e i ther by erasure or cross ing out (a ser ies of paral le l l ines placed on the face of drawing over the deleted por t ions of drawing) , by addi t ion, or by redrawing (a l l del ineat ions shal l be made to scale) .

7.2. Revision Identification

Revis ions shal l be ident i f ied by symbols in the f ie ld of the drawing (see paragraph 7 .4) cross-referenced to the revis ion descr ipt ion. Revis ion symbols shal l be entered in the revis ion block (see Figures 31a, 31b, and 31c, page 69) . Revis ions shal l be by a lphabet ical le t ter and order , except that le t ters I , O, Q, S , X, and Z shal l not be used as revis ion symbols . Fol lowing le t ter Y, use AA, AB, e tc . ; af ter AY, use BA, BB, e tc .

7.3. Revision of Multisheet Drawings

There is only one acceptable method of recording changes to mul t isheet drawings.

Revis ions to any sheet(s) shal l be recorded in the revis ion descr ipt ion block on sheet 1 , and reference shal l be made to sheet(s) affected. Level of revis ion shal l be changed on each drawing sheet whether or not that par t icular sheet i s affected. The revis ion descr ipt ion block on a l l sheets o ther than sheet 1 shal l s ta te “See sheet 1 for revis ions .”

7.4. Revision Recording

A symbol (e .g . , “A3” ) enclosed in a c i rc le shal l appear in the f ie ld of drawing a t the point of revis ion. The le t ter “A” refers to any revis ions completed a t a g iven t ime. The number fol lowing refers to the number of the revis ion made. Figure 31a shows examples of th is . The same symbol may appear more than once i f , in the revis ion descr ipt ion column, more than one act ion took place per l ine (see Figure 31a under symbol “A3,” l ine 2) .

When changes are made to a drawing through a direct incorporat ion, revis ion symbols are required on the f ie ld of the drawing, and abbreviated descr ipt ions of the changes must be recorded in the revis ion block.

When changes are made to a drawing through an EO or Revis ion Notice system, revis ion symbols are not required on the f ie ld of the drawing, but the Revis ion Block must s ta te “See EO number for changes” or “See Revis ion Not ice number ” in the revis ion descr ipt ion column.

For e i ther method of incorporat ion, the person incorporat ing the revis ion, the person ass igned to check the incorporat ion, and the cognizant engineer responsible for the revis ion a l l shal l date and ini t ia l the revis ion block in the approved column.

Page 81: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 69

REVISION

SYM

A3

DESCRIPTION DATE APPROVAL

(1) R.188 WAS R.250(2) ADDED .500, 1.500 AND 2.000 DIMS(3) REM'D .750 AND 7.000 DIMS

1-2-84 (SIGNATURE)

(1) WAS 1.500; (2) WAS .635;(3) WAS 1.000+.005; (4) WAS "NOTE 4" -.000

B4 2-3-84 (SIGNATURE)

Note:

Zone column not required on C-s ize drawings and smaller .

Figure 31a: Sample Revis ion Block

REVISION

SYM

C

DESCRIPTION DATE APPROVAL

(1) REPLACES REV-B WITH CHANGE,SEE EO NUMBER XXX 1-9-84 (SIGNATURE)

Note:

I f no “EO” system is used, the changes would be spel led out , s imilar to Figure 31a.

Figure 31b: Sample Revis ion Block

REVISION

SYM

B

DESCRIPTION DATE APPROVAL

REPLACES REVISION-B WITHOUT CHANGE 1-9-84 (SIGNATURE)

Note:

The old drawing shal l have the s ta tement “REDRAWN WITHOUT CHANGE” added to i ts revis ion block, requir ing no change le t ter , and “SUPERSEDED” added above i ts Ti t le block.

Figure 31c: Sample Revis ion Block

Page 82: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

70 ENGINEERING DRAWING STANDARDS MANUAL

7.5. Redrawn or Replaced Drawings

The next revis ion le t ter in sequence shal l be entered in the revis ion block of the new drawing. To the revis ion block shal l be added “Replaces Revis ion (old revis ion le t ter ) With Change” and a descr ipt ion of the change or reference to an Engineer ing Order (EO) document number shal l be recorded in the descr ip t ion column. Al l previous revis ions shal l be omit ted f rom the superseding drawing. The s ta tement “Replaced With Change By Revis ion (new revis ion le t ter)” shal l be added to the superseded drawing 's revis ion block and “Superseded” shal l be placed in 1/4- inch-high le t ter ing direct ly above the Ti t le b lock. When a drawing is redrawn without changes , the phrase “Replaces Revis ion (old revis ion le t ter) Without Change” shal l be added to revis ion block and revis ion le t ter shal l remain unchanged. See Figure 31c. Original names and dates f rom the old t i t le b lock shal l be typed in on the replacement drawing.

Page 83: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 71

8. PARTS LIST AND INDEX LIST

This sect ion es tabl ishes minimum requirements for the preparat ion and submiss ion of Par ts Lis ts (PL) and Index Lis ts ( IL) used with engineer ing drawings .

Par ts Lis ts may be prepared for each assembly drawing in accordance with this sect ion. For par ts l is ts on drawings , see Figure 34 on page 80 or Figure 3 on page 10.

Index Lis ts may be prepared for each Payload, Engineer ing Model , Major Assembly, Complex Assembly of assemblies , as d irected by Project Manager .

8.1. Definitions

Cover Sheet: This refers to the f i rs t sheet of each Par ts Lis t or Index Lis t and is a record of the revis ions .

Parts List (PL): This is a tabulat ion of the i tems necessary for fabr icat ing or assembling the end i tem(s) to which the l is t appl ies .

Index List (IL): This is a l is t of the one pr incipal and a l l subordinate PLs appl icable to a major assembly.

Bulk Materials: These are i tems that are necessary const i tuents of an assembly or subassembly, for which the quant i ty required is not readi ly predeterminable . Examples are oi l , wax, solder , cement , ink, damping f lu id , grease , powdered graphi te , f lux, welding rod, thread, twine, and chain . I f the quant i ty is known, but the physical nature of the mater ia l is such that i t i s not adaptable to depict ion on a drawing, or the mater ia l can be cut to f in ished s ize by the use of such hand or bench tools as shears , p l iers , knives , e tc . without fur ther machining operat ions , then the mater ia l 's conf igurat ion shal l be ful ly descr ibed in wri t ing without the necess i ty of p ic tor ia l presentat ion.

Special Handling Equipment and Packaging: This term appl ies to i tems such as boxes , shipping containers , cradles , crane a t tachments , and other specia l i tems needed for s tor ing and t ranspor t ing.

Special Test Equipment: This term appl ies to i tems of special tes t equipment that are required for government inspect ion or service maintenance, such as tes t s tands , indicators , e tc .

Applicable Standards, Specif icat ions, and Publicat ions: This term appl ies to documents referenced on or invoked by the drawings .

8.2. Requirements

8.2.1. List Preparation

The PL and IL may be prepared manual ly or by typewri ter or computer word processor .

Page 84: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

72 ENGINEERING DRAWING STANDARDS MANUAL

8.2.2. List Formats

Lists shal l use prepr inted 8 1/2- by 11- inch s ize format . The preparat ion requirements are provided herein .

When more than a s ingle sheet i s required to prepare or revise a l is t , the l is t t i t le is required on the f i rs t sheet only.

The design act iv i ty shal l use a cover sheet as i l lus t ra ted in Figure 32a on page 74. Entr ies on the cover sheet shal l be completed as expla ined in “Cover Sheet ,” sect ion 8 .3 , below.

8.2.3. Revision Identification

A revis ion le t ter and the date of revis ion shal l be appl ied to each l is t when any change is made. The le t ters I , O, Q, and X shal l not be used as revis ion le t ters . Lis t shal l be revised independent ly of the associa ted drawings.

8.2.4. Deleting Items

I tems to be deleted may be e i ther l ined out , erased, or omit ted .

8.2.5. Adding Items

New or superseding i tems may be added a t the end of a l is t or inser ted in the l is t in proper sequence.

8.3. Cover Sheet

The Cover Sheet shal l be the f i rs t sheet for each PL or IL and shal l be prepared as indicated herein .

8.3.1. Format

The Cover Sheet shal l be prepared on Form 670-36 (1/65) . Refer to Figure 32a on page 74.

8.3.2. Entries

Entr ies shal l be made in the blocks and columns of the Cover Sheet as d irected on the fol lowing page:

1 . CODE IDENT: Enter Code Ident i f ica t ion number as ass igned by Federal Supply CAGE Publicat ion H4/H8 for us ing act iv i ty . Number is located in t i t le b lock of design act iv i ty .

2 . LIST NO.: Enter the number of the PL or IL for which the cover sheet i s being prepared.

3 . SHEET OF : Enter the to ta l number of sheets used.

Page 85: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 73

4. REV: Enter revis ion le t ter of the la tes t revis ion to the PL. Changes to th is b lock shal l be made by erasure .

5 . ITEM NOMENCLATURE: Enter the same nomenclature that appears in the Ti t le b lock of the assembly for which the l is t i s being prepared. The i tem nomenclature shal l a lways be a noun.

6 . VENDOR: I f prepared by contractor for GSFC, enter contractor name and Federal Supply CAGE Code Numbers .

7 . PREPARED: Enter name of person prepar ing l is t .

8 . APPROVED: Enter s ignature of person approving for accuracy and completeness .

9 . ENG APPROVAL: Enter s ignature of Assis tant Project Engineer (opt ional) .

10. ENG APPROVAL: Enter s ignature of Project Engineer (mandatory for a l l procurement) .

11. AUTHENTICATION: Enter name of person designated to s ign for des ign act iv i ty or d ivis ion.

12. CONTRACT NO: When prepared by contractor for GSFC, enter the contract number .

13. LTR: Enter revis ion le t ter of current revis ion.

14. DESCRIPTION: Enter a complete and concise descr ipt ion of the revis ion that appl ies to the PL.

15. DATE: Enter date of revis ion.

16. APP (Approval) : Enter in i t ia ls of person complet ing revis ion review.

17. RECORD OF REVISION: Enter revis ion s ta tus of individual PL sheets .

Page 86: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

74 ENGINEERING DRAWING STANDARDS MANUAL

Figure 32a: Parts L ist (and Index List) Cover Sheet

Page 87: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 75

8.4. Parts List Continuation Sheet

The PL cont inuat ion sheet shal l be prepared as indicated herein . Circ led numbers have been ass igned to each column or block for ident i f icat ion only. The PL shal l contain a cover sheet and as many PL cont inuat ion sheets as necessary to completely l is t a l l the information.

8.4.1. Format

The PL cont inuat ion sheet shal l be prepared on Form 670-37 (1/65) . Refer to Figure 32b on page 76

8.4.2. Entries

Entr ies shal l be made in the blocks and columns as directed below:

1 . PARTS LIST NO.: On each sheet of the PL, enter the number of the corresponding drawing.

2 . SHEET NO.: On each sheet , enter the appropr ia te sheet number .

3 . ITEM FIND NOS.: Enter number taken f rom assembly drawing.

4 . DWG. DOCUMENT PART OR STOCK NO.: Enter the par t number or o ther ident i fying number of each i tem in the l i s t .

5 . QTY REQD PER ASSY.: Enter the quant i ty required for each assembly.

6 . CODE IDENT NO. (Code ident i f ica t ion number) : Enter appropr ia te number ass igned to the des ign act iv i ty per CAGE Publicat ion H4/H8. When a government or industry s tandard par t or specif ica t ion number appears in Column 4, no entry shal l be made in Column 6. When the Code Ident i f icat ion Number for an i tem is ident ical to that entered in Block 1 of the Cover Sheet , do not repeat the number in Column 6 of the PL cont inuat ion sheet .

7 . DRAWING TITLE OR ITEM DESCRIPTION (I tem descr ipt ion or nomenclature) : Enter the noun or noun phrase descr ibing the i tem whose par t or ident i fying number appears on assembly drawing.

8 . REMARKS: Enter informat ion that could be useful for reference [ i .e . , specif icat ion, control drawings , des ignat ions (e .g . , R10, J14, e tc . ) , vendor 's i tems, e tc . ] .

Page 88: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

76 ENGINEERING DRAWING STANDARDS MANUAL

Figure 32b: Parts L ist Cont inuat ion Sheet

Supplementary Heading Lis t . In addi t ion to the headings that are used for the i tems of the PL, a supplementary heading l is t as s ta ted below shal l be used i f appl icable:

- Bulk Mater ia l . - Specia l Handling Equipment and Packaging. - Specia l Test Equipment .

Page 89: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 77

- Applicable Standards , Specif icat ions , and Publ icat ions .

8.5. Index List Continuation Sheet

The IL cont inuat ion sheet shal l be prepared as indicated herein . Circ led numbers have been ass igned to each column or block for ident i f icat ion only. The IL shal l contain a cover sheet and as many IL cont inuat ion sheets as necessary to completely l is t a l l the information.

8.5.1. Format

The IL cont inuat ion sheet shal l be prepared on Form 670-39 (1/65) . Refer to Figure 33 on page 78.

8.5.2. Entries

Entr ies shal l be made in the blocks and columns as directed below:

1 . INDEX LIST NUMBER: On each sheet , enter the number of f i rs t assembly level ( top or main assembly) .

2 . SHEET NO.: On each sheet , enter the appropr ia te sheet number .

3 . CODE IDENT.: Enter code ident i f icat ion taken from PL.

4 . LIST NO.: Enter number of the PL.

5 . LIST NOMENCLATURE: Enter nomenclature as i t appears on the PL.

6 . ASSY LEVEL: Enter the next assembly level number of the l is t number .

Page 90: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

78 ENGINEERING DRAWING STANDARDS MANUAL

Figure 33: Index List Cont inuat ion Sheet

Page 91: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 79

8.6. Find or Item Number System of Identification

8.6.1. Definition

A f ind number or i tem number is a number ass igned to a par t or subassembly for the purpose of locat ing the par t or subassembly in the f ie ld of the assembly drawing. The f ind or i tem number is a lso shown in the Par ts Lis t for an assembly drawing, whether the l is t i s separate or an in tegral par t of the drawing. The “f ind number” is usual ly associa ted with a separate Par ts Lis t , and the “ i tem number” is usual ly associa ted with the Lis t of Mater ia l on drawings , but both are used for locat ing par ts . Par ts and subassemblies are ident i f ied by other numbers for purposes of procurement and marking. These ident i fying numbers are cross-referenced to the f ind or i tem numbers in the PL or in a tabula t ion on the assembly drawing.

8.6.2. Application and Limitation

The f ind or i tem number sys tem provides a quick means of locat ing par ts on a re la t ively small area of a drawing having a high densi ty of par ts . I t i s preferred that the convent ional method of ident i f ica t ion ( i tem numbers) be used on drawings of s imple assemblies , even though f ind and par t numbers are used for complex assemblies that are components of the same equipment . See Figure 34 on page 80. For a sample drawing of an assembly us ing the f ind and par t number sys tem, see Figure 17 on page 40. The i tem number system of ident i f icat ion shal l a lso be used to locate pieces on drawings of inseparable assemblies when mater ia l specif icat ions or mater ia l tempers dif fer f rom one another .

Page 92: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

80 ENGINEERING DRAWING STANDARDS MANUAL

EXPERIMENT8

11

7

6

3

5

4

13

3

2

1

14

10

9

4

13

3

2

GD1416697 MOUNT C, ASSEMBLY

1 1 GD1416678 BASE, MOUNT C2 2 GC1416680 SEAT, MOUNT C3 3 GC1416640 BEARING4 2 GC1416681 SHAFT, BEARING5 1 GD1416679 STEM, MOUNT C

6 1 GC1416638 SEAT, LOWER

7 1 GC1416637 SEAT, UPPER8 1 GC1416636 SLEEVE

9 1 SPACER

10 1 SHIM

11 2

NUT, 3/4-16 UNF-3B

CRES

12 1 NUT, 5/8-18 UNF-3B CRES

13 4

SCREW, CAP, HEXAGON HD

CRES

14 4 NUT, 1/4-2B UNF-3B CRES

GC1416635-1

MS20500-428

MS35308-314

MS20500-1018

MS20500-1214

GC1416639-1

X

A

A12

INTERFACE

A-ASECTION

REV

REV

DATE APPROVAL

FOLD

LINE

GC

GREENBELT, MARYLAND

SH

DESCRIPTION

REVISION

MATERIAL

Goddard Space Flight Center

WTSCALE

DRAWING INTERPRETED PER GSFC-X673-64-1

MATERIAL SPEC & NO.PART NO.

HARDNESS TEST NOT REQUIRED

REMOVE ALL BURRS AND SHARP EDGES R .010 OR CHAMFER MAX.

UNLESS OTHERWISE SPECIFIED-DIMENSIONS ARE IN INCHES

TEST HARDNESS PER ASTM E-18, LOCATION OPTIONAL

TEST HARDNESS PER ASTM E-18 WHERE INDICATED

ON FIELD OF DRAWING THUS

NO NON-DESTRUCTIVE EXAMINATION (NDE) REQ'D

NDE REQUIRED PER S-313-009 CODETHIS DRAWING WAS PRODUCED USING

SOFTWARE:

FILE NAME:

VERSION:

TOLERANCES:

FLIGHT HARDWARE/POST FAB HARDNESS TEST REQ'D

FOLD

LINE

.XX

ITEM

NO.

NEXT ASSY

.XXX

REQDREQD

NAME

LIST OF MATERIAL

NATIONAL AERONAUTICS AND

SPACE ADMINISTRATION

DESCRIPTION

APPROVED-STRESS

APPROVED-ENGINEER

NON FLIGHT

USED ON

FRACTIONS

±1/16

APPROVED

DESIGNER

DRAWN

CHECKED

APPROVED

125DATEINIT

CODE

TITLE

SYM

GC

±.02 ±.005 ±1°

Figure 34: Sample Assembly Drawing With List of Mater ia l

8.6.3. Drawing Requirements

When used in the f ie ld of the drawing, i tem numbers shal l be enclosed in c ircular-shaped 1/2- inch-diameter bal loons . For drawings of e lectronic chassis assemblies , i f the out l ines of res is tors or capaci tors are shown, the reference designat ions shal l be placed within those out l ines when pract ical . The corresponding f ind numbers shal l be omit ted f rom the views. In such cases , a table shal l be provided on the drawing to show the f ind number ass igned to each i tem that i s ident i f ied by a reference designat ion on the views. The same f ind number shal l be used for any group of reference designat ions ass igned to i tems of ident ical character is t ics . The i tem or f ind numbers on any drawing shal l be ass igned independent ly of those on any other drawing. Find numbers ass igned to subassemblies shown on an assembly drawing shal l be dis t inguished f rom those ass igned to par ts by adding a le t ter suff ix to the subassembly f ind number .

Page 93: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 81

8.7. List of Material

A Lis t of Mater ia l (LM) shal l be prepared and included on each assembly drawing to provide the individual par t or subassembly i tem number , quant i ty required, par t number , descr ipt ion, mater ia l , and mater ia l specif icat ion. See Figure 34 on page 80.

8.7.1. Format

The Lis t of Mater ia l shal l be placed above the drawing Ti t le block as shown in Figure 34 on page 80.

8.7.2. Entries

Entr ies shal l be made in the blocks and columns as indicated in Figure 3 on page 10.

Page 94: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

82 ENGINEERING DRAWING STANDARDS MANUAL

9. DOCUMENTATION MANAGEMENT

9.1. Typical Drawing Flow for Flight Projects

Engineer(acceptance or rejection)

Engineer(concept)

Designer Documents(detail, subassy., assy., instl., etc.)

on CAD or conventional board drawing

Designer(layout)

Engineer (approvalof layout concepts)

Engineer(review)

Design Analyst(checking/review)

Designer(modifications)

Design Analyst(checking approval of

CAD/paper or vellum original)

Engineer(approval)

Configuration Manager1. Update Master CAD File with Names & Dates

2. Release Prints to Fabrication

Changes to Released Drawings

Engineer(considerationof suggestions

affecting design)

PartsCompleted

PartsGSFC QA

No Yes Engineer EOs(change notice)

AdvanceShop Copy(optional)

Designer(records change &

forwards check copy)

Figure 35: Typical Drawing Flow for Fl ight Projects

Page 95: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 83

9.2. Archiving

Drawings , Engineer ing Orders (EOs) , Cer t i f ica t ion Logs, Associa ted Lis ts , and Engineer ing Par ts Lis ts (EPLs) shal l be archived af ter s ignoff . Fol lowing are some sample archiving methods:

a . Fi l ing of a l l paper or ig inals .

b . Scanning of the paper or ig inals to a s tandard digi ta l ras ter image format such as CCITT Group 4 (CALS, MIL-R-28002) and then us ing a digi ta l s torage system to archive the resul t ing database of ras ter images .

c . Microf i lming and s tor ing on aper ture cards when requested by a GSFC divis ion that s t i l l has equipment to re t r ieve the information.

Note:

Before deciding to archive using aper ture cards , the avai labi l i ty of re t r ieval equipment and the qual i ty of reproduct ion should be considered. The qual i ty of drawings, l i s ts , and documents shal l meet the legibi l i ty and contras t requirements of MIL-D-5480 and MIL-M-9868. The microf i lm suppl ied shal l be Type I , Class 1 .

9.3. Computer-Aided Design Drawings

The purpose of th is sect ion is to se t pol icy on how Computer-Aided Design (CAD) drawings are to be handled while act ive , suppl ied, documented, and archived.

9.3.1. Presentation of Computer-Generated Data

A computer graphics or CAD program is used to create e lectronic data f i le drawings . A paper or ig inal is produced on which drawing s ignature requirements are placed. The e lectronic data f i le must be updated to include names, in i t ia ls , and dates . The paper or iginal i s now the act ive or ig inal and is f i led with the conf igurat ion manager (CM), a long with the e lectronic data f i le which must be used for future changes .

When a revis ion is needed, an Engineer ing Order (EO) paper or ig inal is wri t ten and submit ted to the CM for d is t r ibut ion and f i l ing . After no more than f ive outs tanding EOs are wri t ten , a new electronic CAD drawing should be produced by the or ig inat ing GSFC group or contractor . The changes shal l be recorded in the revis ion block, dated , and in i t ia led . A new paper or ig inal wi th the changes incorporated, dated, and ini t ia led, shal l replace the previous or ig inal in the CM fi le . The new or ig inal shal l be so s tamped, dated, and s igned by the CM representat ive .

Page 96: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

84 ENGINEERING DRAWING STANDARDS MANUAL

CAD data f i les are to be s tored on media that are compat ible wi th current ly used GSFC systems. These media include mult i t rack reels of computer tape or f lexible disks (3-1/2” or 5-1/4” double s ide , h igh densi ty) . Each s torage medium may conta in one or more f i les . The fol lowing shal l accompany each s torage request :

a . A computer-generated l is t of informat ion contained on each piece of s torage medium (for example: number , drawing s ize , e tc . ) .

b . The brand name of the computer and sof tware used to create the f i les , and the sof tware vers ion number i f pract ical .

GSFC requires that CAD data be conver ted to a s tandard format , such as the Drawing Interchange Fi le (DXF) or In i t ia l Graphics Exchange Specif icat ion ( IGES). Refer to the Nat ional Ins t i tu te for Standards and Technology for the la tes t vers ion of IGES. This type of format a l lows the CAD data to be read by dif ferent types of CAD systems. For a technical overview of IGES, refer to the Nat ional Bureau of Standards publ icat ion, NBS IR81-229, A Technical Brie f ing on the Ini t ia l Graphics Exchange .

9.3.2. Developing and Using Computer-Generated Drawings

All quest ions regarding the la tes t information systems and appl icat ions should be directed to the Computer-Aided Design Sect ion of the Mechanical Engineer ing Branch. Drawings generated by computer must be to scale per sect ion 3 .4 on page 32 of th is manual .

9.3.3. Specification Data

The American Nat ional Standards Ins t i tu te publ icat ion, Digi ta l Representat ion for Communicat ion of Product Def ini t ion Data (ANSI Y14.26M-1987 and updates) , should be consul ted to es tabl ish a s tandard data communicat ions format .

Page 97: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 85

10. DESIGN REFERENCES, STANDARDS, AND SPECIFICATIONS

10.1. Dimensioning and Tolerancing

10.1.1. Dimensioning and Tolerancing Practices

The dimensioning and to lerancing for a l l types of drawings shal l be in accordance wi th ANSI Y14.5M-1982 (or la ter revis ions) . Copies are avai lable f rom

American Nat ional Standards Inst i tu te 1430 Broadway New York, NY 10018

American Society of Mechanical Engineers 345 E. 47th Street New York, NY 10017

10.1.2. Statements on Dimensioning

a. Dimensions shal l be chosen and placed on drawings based on the par ts in terre la t ionships with mating par ts , not to ins ignif icant theoret ical center l ines .

b . Pr imary, secondary, and ter t iary datum features shal l be labeled in a lphabet ical order when creat ing a new drawing.

c . Drawings of par ts requir ing templates in the fabr icat ion process and their template drawings must be dimensioned a l ike . Refer to tool ing required notes in “Dimension Notes ,” paragraph 2 .4 .4 .1 on page 16.

d . Use a minimum of reference dimensions on drawings .

e . When us ing t rue posi t ion dimensioning*, the dimension f rom the feature to other edges and i ts perpendicular i ty re la t ionship to a surface must be ident i f ied with datum le t ters . Impl ied datums (when no datum let ter (s) are specif ied) are no longer acceptable .

*basic , or theoret ical ly exact d imensions; example:

X.XXX

Page 98: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

86 ENGINEERING DRAWING STANDARDS MANUAL

10.2. Metric Dimensioning

NMI 8010.2A, Use of the Metr ic System of Measurement in NASA Programs , es tabl ishes pol icy and requirements for use of the metr ic measurement system (a lso known as the Internat ional System of Units , or SI) in NASA programs and the condi t ions under which both English and metr ic measurements may be used. When metr ic d imensioning is to be used, the documents ASTM E380-91a, Standard Pract ice for Use of the Internat ional Sys tem of Units (SI) , and NAS10000, NA Documents Preparat ion and Maintenance in SI (Metr ic) Units , g ive specif ic information and convers ion factors .

10.2.1. SI Units and Symbols

a. SI base uni ts are seven well-def ined uni ts that are regarded as dimensional ly independent . They are as fol lows:

SI Base Uni ts

Quantity Name Symbol length mass time electric current thermodynamic temperature* luminous intensity amount of substance

meter kilogram second ampere kelvin candela mole

m kg s A K cd mol

Selected Lis t of Der ived Units

Quantity Name or Unit Symbol Formula acceleration angular acceleration angular velocity area density, mass electric charge electric potential electrical resistance energy force frequency magnetic flux moment of force power pressure or stress velocity volume

meter per second squared radian per second squared radian per second square meter kilogram per cubic meter coulomb volt ohm joule newton hertz weber newton meter watt pascal meter per second cubic meter

m/s2

rad/s2

rad/s m2 kg/m3 C V (Omega) J N Hz Wb N x m W Pa m/s m3

- - - - - A x s W/A V/A N x m kg x m/s2 1/s V x s - J/s N/m2 - -

*The SI temperature scale is the International Thermodynamic Kelvin Scale, symbol K. Degree Celsius, symbol C, is for general use. The span of one degree Celsius is exactly one Kelvin.

Page 99: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 87

b. Dimensioning and to lerancing shal l be in SI uni ts and decimal f ract ions of the uni t . Al l l inear d imensions shal l be in mil l imeters and decimal f ract ions of mil l imeters . Al though the SI uni t for the plane angle is the radian, angles s ta ted in degrees , minutes , and seconds, or in degrees and decimal of a degree (preferred) , shal l be used when dimensioning par ts . The number of decimal places in the dimension shal l be the same as the number of p laces in the required to lerance. The rounding of dimensions and tolerancing shal l be in accordance with sect ion 10.2 .2 .2 on page 89. Drawings shal l be dimensioned and toleranced in accordance wi th ANSI Y14.5M-1982.

c . Surface texture values shal l be noted in micrometers (µm). See the fo l lowing table:

Surface Texture Conversion Values

Micrometers Microinches

Roughness Grade

Numbers 50 25 12.5

6.3 3.2 1.6 0.8 0.4 0.2 0.1 0.05 0.025

2000 1000

500 250 125

63 32 16

8 4 2 1

N12 N11 N10 N9 N8 N7 N6 N5 N4 N3 N2 N1

d. Forces , such as tensi le and shear loads , shal l be shown in newtons (N) .

e . Stresses shal l be shown in megapascals (MPa = Pa x 106 ) . The fol lowing table gives examples :

Ul t imate Strength

Engl ish (PSI) SI (MPa)

Tensi le Shear Tensi le Shear 85,000

125,000 160,000 180,000 220,000 260,000

50,000 75,000 95,000

110,000 132,000 156,000

600 900

1 ,100 1 ,250 1 ,550 1 ,800

340 540 660 750 930

1 ,080

f . Pressure values for l iquid and gas shal l be shown in ki lopascals (kPa = Pa x 103 ) .

Page 100: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

88 ENGINEERING DRAWING STANDARDS MANUAL

g. Mass values shal l be shown in ki lograms (kg) .

h . Preferred diameter /pi tch combinat ions for threaded fas teners are shown in the fol lowing table , in accordance with ISO/TC20/SC4 Resolut ions 169 and 220.

Dash Numbers

Thread Size Nominal Size

First Overs ize (0.5 mm)

Second Overs ize

(1 mm) 1.0 x 0.25 1.2 x 0.25 1.6 x 0.35

2.0 x 0.40 2.5 x 0.45 3.0 x 0.50

3.5 x 0.60 4.0 x 0.70 5.0 x 0.80

6.0 x 1.0 7.0 x 1.0 8.0 x 1.0

10.0 x 1.25 12.0 x 1.25 14.0 x 1.50

16.0 x 1.50 18.0 x 1.50 20.0 x 1.50

22.0 x 1.5 24.0 x 2.0 27.0 x 2.0

30.0 x 2.0 33.0 x 2.0 36.0 x 2.0 39.0 x 2.0

-010 -012 -016

-020 -025 -030

-035 -040 -050

-060 -070 -080

-100 -120 -140

-160 -180 -200

-220 -240 -270

-300 -330 -360 -390

- - - - - - - -

-055

-065 -075 -085

-105 -125 -145

-165 -185 -205

-225 -245 -275

-305 -335 -365 -395

- - - - - - - - - - -

-090

-110 -130 -150

-170 -190 -210

-230 -250 -280

-310 -340 -370 -400

Page 101: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 89

i . The to lerance block on the GSFC drawing format shal l be in accordance with the format example in Figure 2b on page 6 . Tolerances given in the format may be adjusted to ref lect the requirements of the des ign.

j . Preferred Metr ic Limits & Fi ts (ANSI B4.2-1978) encompasses to lerance required designat ions , preferred l imits , bas ic s izes , and symbols .

k . General Tolerances for Metr ic Dimensioned Products (ANSI B4.3-1978) is used for metr ic d imensions without to lerance designat ions .

10.2.2. Unit Conversions

10.2.2.1. Conversion of Dimensions

Following is a table of se lected convers ion factors . I f fur ther convers ion factors are needed, the references out l ined in paragraph 10.2 on page 86 are very useful .

To Convert From: To: Multiply By: inch in2 foot ft2 lb lbf/in2 (psi)

meter m2 meter m2 kg Pa

2.540000 E–2* 6.451600 E–4* 3.048000 E–1* 9.290304 E–2* 4.5359237 E–1* 6.894757 E3

degrees Fahrenheit degrees Fahrenheit

degrees Celsius kelvin

tC = (tF – 32)/1.8* tK = (tF + 459.67)/1.8*

*Exact convers ion

10.2.2.2. Unit Rounding

a. General Rounding Rules

When a f igure is to be rounded to fewer digi ts than the to ta l number avai lable and the f i rs t d igi t d iscarded is less than 5 , the las t d igi t re ta ined should not be changed. For example , 3 .46325, i f rounded to three decimal places ( i .e . , 4 s ignif icant d igi ts or s imply 4 digi ts) , would be 3 .463; i f rounded to three s ignif icant d igi ts , 3 .46.

When the f i rs t d ig i t d iscarded is greater than 5 , or i f i t i s a 5 fol lowed by a t leas t one digi t o ther than 0 , the las t d igi t re ta ined should be increased by one uni t . For example 8 .37652, i f rounded to four d igi ts , would be 8 .377; i f rounded to three digi ts , 8 .38.

Page 102: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

90 ENGINEERING DRAWING STANDARDS MANUAL

When the f i rs t d igi t d iscarded is exact ly 5 , fo l lowed only by zeros , the las t d igi t re ta ined ( i .e . , the digi t preceding the 5 , under l ined in the examples below) should be rounded upward i f i t i s an odd number , but no adjus tment made i f i t i s an even number . For example , 4 .365, when rounded to three s ignif icant d igi ts , becomes 4 .36. The number 4 .355 would a lso round to the same value , 4 .36, i f rounded to three s ignif icant d igi ts . This procedure is known as “odd-even rounding.”

Example: Round 46.02500 to two decimal places .

Answer: 46.02

Example: Round 41.27500 to two decimal places .

Answer: 41.28

General ly , the accuracy of the number of s ignif icant digi ts to which a value is to be rounded must be known before a convers ion factor is used. I f th is is not known, then the bes t ru le of thumb is to round the f inal value to the number of s ignif icant d igi ts corresponding to the leas t number of s ignif icant d igi ts of the or ig inal , unconver ted numbers . For example , to conver t 11.4 feet ( f t ) to meters (m): 11.4 x 0 .3048 = 3 .47472, which rounds to 3 .47 meters . Nei ther the convers ion factor nor the quant i ty shal l be rounded before performing the mul t ipl icat ion, because accuracy would be reduced. For conver t ing inches ( in) to mil l imeters (mm), which would general ly be the case in drawings , the rule of thumb is to round to one less decimal place than the or iginal inch dimension. When conver t ing f rom mil l imeters to inches , the rule is to round to two more decimal places than the or iginal value.

Example: Conver t 3 .5748 inches to mil l imeters .

3 .5748 x 25.4 = 90.79992 Answer: 90 .800 mm

Example: Conver t 1 .625 inches to mil l imeters .

1 .625 x 25.4 = 41.275 Answer: 41 .28 mm

Example: Conver t 101.83 mil l imeters to inches .

101.83/25.4 = 4 .009055118 Answer: 4 .0091 inches

b . Rounding Basic Dimensions

To conver t bas ic dimensions of drawings f rom inches to mil l imeters , the conver ted value shal l be rounded to three decimal places s ince this shal l provide a maximum convers ion error of 0 .00002 inch. In conver t ing bas ic d imensions f rom mil l imeters to inches , the value shal l be rounded to f ive decimal places , g iving a maximum convers ion error of 0 .000005 inch.

Page 103: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 91

c. Rounding Toleranced Dimensions

The use of the exact re la t ion 1 inch = 25.4 mil l imeters general ly produces more than the required number of s ignif icant d igi ts . To round both the dimension and the to lerances , f i rs t conver t the values to the necessary uni ts . When conver t ing f rom inches to mil l imeters , mul t ip ly by 25.4 for a product ; when conver t ing f rom mil l imeters to inches , d ivide by 25.4 for a quot ient . Next , take the to ta l to lerance ( i .e . , the to ta l value between the maximum and minimum l imits) and f rom the respect ive table below f ind the correct number of decimal places . Then round both the dimension and the to lerances to the number of decimal places indicated. However , care must be taken so that the rounded to lerances fa l l ins ide the or ig inal to lerance values as expla ined in paragraph 10.2 .2 .2 .d . , “Precis ion Rounding,” on page 92.

Original Total Tolerance in Inches

At Least: But Less Than: Round Product To: 0.4 & over 0.04 0.004 0.0004 0.00004

0.4 0.04 0.004 0.0004

Whole mm 0.X mm 0.XX mm 0.XXX mm 0.XXXX mm

Original Total Tolerance in Millimeters

At Least: But Less Than: Round Quotient To: 2.0 & over 0.2 0.02 0.002

2.0 0.2 0.02

0.XX in 0.XXX in 0.XXXX in 0.XXXXX in

Example: Conver t 1 .387 ± 0 .003 inches to mil l imeters .

1 .387 x 25.4 = 35.2298; 0 .003 x 25.4 = 0 .0762

35.2298 ± 0 .0762

The to ta l or ig inal to lerance is 0 .006, which l ies between 0 .004 and 0 .04, and according to the f irs t table , should be rounded to 0 .XX mil l imeter .

Answer: 35.23 ± 0 .08 mm

Page 104: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

92 ENGINEERING DRAWING STANDARDS MANUAL

d. Precis ion Rounding ( Ins ide)

When conver ted, to lerances must never exceed the or iginal ly specif ied l imits (as in the case where the “conver ted” par ts are to be inspected by gages made for the or ig inal par ts) . The round-off must be such that the new dimensions shal l l ie ins ide the or iginal to lerance l imits . This may be accomplished by conver t ing the maximum and minimum l imits exact ly, and then rounding the upper l imit to the next lower value and rounding the lower l imit to the next h igher value.

Example: Conver t 0 .877 f rom inches to mil l imeters wi thout 0 .874 violat ion of the or ig inal l imits :

0 .877 x 25.4 = 22.2758; 0 .874 x 25.4 = 22.1996

The to ta l or ig inal to lerance is 0 .003, which l ies between 0 .0004 and 0 .004 and, according to the preceding table , should be rounded to 0 .XXX mil l imeters .

Answer: 22.275 mm 22 .200 mm

Note that 22.2758 is not rounded to 22.276 mm because i t would viola te the “ inside” rule .

10.3. Design References

a. Finishes of Metal and Wood Surfaces: MIL-STD-171. Reference document ( for a working knowledge) : MIL-HDBK-132A.

b . Gears /Gear Class if ica t ion and Inspect ion Handbook Tolerances and Measur ing Methods for Unassembled Spur and Helical Gears ( including metr ic equivalents) : AGMA 2000-A-88.

c . Gear Class if ica t ion, Mater ia ls , and Measur ing Methods for Bevel , Hypoid, Fine Pi tch Wormgear ing, and Racks Only as Unassembled Gears : AGMA 390.03A-88.

d . Optics /General Specif icat ion Governing the Manufacture , Assembly, and Inspect ion of Optical Components for Fire Control Ins truments : MIL-O-13830 .

e . Solder ing/General Specif icat ion for Solder ing Process ( for nonelectr ical appl icat ions) : MIL-S-6872.

f . Spr ings/Drawing Requirements for Mechanical Spr ings: MIL-STD-29.

Page 105: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 93

10.4. Control of Surface Roughness

10.4.1. Surface Texture

Surface texture , surface roughness , waviness , and lay shal l be in accordance wi th ANSI B46.1-1985 (or la ter revis ions) . The symbols below are examples of microinch f in ish symbols and their micrometer equivalents that are most commonly used. Refer to the ANSI B46.1-1985 for fur ther data such as waviness and lay. Metr ic equivalents with roughness grade numbers to the fol lowing are found in paragraph 10.2 .1c on page 87.

Microinch Micrometer

Rough Machining.

Mat ing Surfaces .

Moving Par ts .

Precis ion Par ts .

Pol ished Par ts .

Lapped Par ts .

10.4.2. Surface Texture Symbols

Symbols depict ing acceptable surface condi t ions shal l be in accordance wi th ANSI Y14.36-1978 (R 1987) (or la ter revis ions) .

10.4.3. Surface Texture Standards

Copies of both ANSI B46.1-1985 and ANSI Y14.36-1978 are avai lable f rom

American Nat ional Standards Inst i tu te 1430 Broadway New York, NY 10018

10.5. Thread Specifications

Screw-thread convent ions , methods of specifying, and design shal l be in accordance with the fol lowing specif icat ions:

a . Screw-Thread Standards for Federal Services , Federal Standard FED-STD-H28, detai led s tandards as fol lows:

Page 106: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

94 ENGINEERING DRAWING STANDARDS MANUAL

FED-STD-H28/1 Nomenclature , Def ini t ions , and Let ter Symbols for Screw Threads .

FED-STD-H28/2 Unif ied Thread Form and Thread Ser ies for Bol ts , Screws, Nuts , Tapped Holes , and General Applicat ions .

FED-STD-H28/3 Unif ied Threads of Specia l Diameter , Pi tches , and Lengths of Engagement .

FED-STD-H28/4 Control led Radius Root Screw Threads , UNJ Symbol .

FED-STD-H28/5 Unif ied Minia ture Screw Threads .

FED-STD-H28/6 Gages and Gaging for Unif ied Screw Threads .

FED-STD-H28/7 American Standard Pipe Threads (except Dryseal and Hose Coupling Types) .

FED-STD-H28/8 Dryseal American Standard Pipe Threads .

FED-STD-H28/9 Gas Cyl inder Valve Out le t and Inle t Threads.

FED-STD-H28/10 American National Hose Coupling and Fire-Hose Coupling Threads .

FED-STD-H28/11 Hose Connect ions for Welding and Cutt ing Equipment .

FED-STD-H28/12 Acme Threads .

FED-STD-H28/13 Stub Acme Threads .

FED-STD-H28/14 National Buttress Threads .

FED-STD-H28/15 American Standard Rolled Threads for Screw Shel ls of Electr ic Lamp Holders and for Screw Shel ls of Unassembled Lamp Bases .

FED-STD-H28/16 Microscope Object ive and Nosepiece Threads , 0 .800—36AMO.

FED-STD-H28/17 Surveying Ins trument Mounting Threads .

FED-STD-H28/18 Photographic Equipment Threads .

FED-STD-H28/19 Miscel laneous Threads .

FED-STD-H28/20 Inspect ion Methods for Acceptabi l i ty of UN, UNR, UNJ, M, and MJ Screw-Threads .

FED-STD-H28/21A Metr ic Screw-Thread Standards .

FED-STD-H28/22 Metr ic Screw-Thread Gages .

b . General Specif icat ion for Screw Threads , Standard, Opt imum Selected Ser ies , Mil i tary Specif icat ion MIL-S-7742.

Page 107: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 95

c. General Requirements for Pipe Threads , Taper , Aeronaut ical Nat ional Form, Symbol-ANPT, Mil i tary Specif icat ion MIL-P-7105.

d . General Specif ica t ion for Screw Threads , Control led Radius Root With Increased Minor Diameter , Mil i tary Specif icat ion MIL-S-8879.

e . Metr ic Screw Threads M Prof i le ANSI/ASME B1.13M-1983.

f . Metr ic Screw Threads MJ Prof i le ANSI B1.21M-1978.

g . Screw Thread Representat ions (Convent ions and Methods of Specifying) , American National Standard ANSI Y14.6-1978, and ANSI Y14.6aM-1981 (Metr ic Supplement) .

10.6. Welding—Fusion and Resistance

10.6.1. General

The s tandard def ini t ion for the term “weld” is a local ized coalescence of metals where coalescence is produced by heat ing to sui table temperatures , with or without the appl icat ion of pressure , and with or wi thout the use of f i l ler metal . The f i l ler metal e i ther has a melt ing point approximately the same as the base metal or has a melt ing point below that of the base metal but above 800 degrees F. For s tandard welding specif icat ion cal louts , refer to “Joining Method Notes ,” paragraph 2 .4 .4 .3 on page 18.

10.6.2. Basic Weld Symbols and Their Location Significance

Basic weld symbols and their locat ion s ignif icance shal l be in accordance wi th ANSI AWS A 2.4-86 (or la ter revis ions) .

Copies are avai lable f rom

American Welding Society 2501 NW 7th Street Miami, FL 33125

10.7. Outgassing of Spacecraft Materials

NASA Reference Publ icat ion, RP-1124, November 1990, Outgass ing Data for Select ing Spacecraf t Materials , covers a wide range of mater ia ls , including adhesives , compounds, coat ings , insulat ion, and var ious other mater ia ls . As presented, the data represent the “ tota l mass loss” (TML) and the “Col lected Volat i le Condensable Mater ia ls” (CVCM), as der ived f rom tes ts a t 398 K (125 C) for 24 hours in vacuum per ASTM E595-84.

The publ icat ion can be purchased as document number N-88-10117 f rom

Page 108: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

96 ENGINEERING DRAWING STANDARDS MANUAL

Nat ional Technical Informat ion Service (NTIS) 5285 Por t Royal Road Spr ingf ie ld , VA 22151

10.8. Standards and Specifications Index

10.8.1. National Bureau of Standards

NBS IR81-229, A Technical Brief ing on the Ini t ia l Graphics Exchange Specif icat ion ( IGES).

10.8.2. Federal

Commerce Commission Regulat ion 49-CFR71-78 Commerce Commission Safety Regulat ions

Commercial and Government Ent i ty (CAGE) Publ icat ion H4/H8 Sect ion A: Name to CAGE Code; Sect ion B: CAGE Code to Name (formerly FSCM H4 and FSCNM H8).

FED-STD-H28/1, Nomenclature , Def ini t ions , and Let ter Symbols for Screw Threads .

FED-STD-H28/2, Unif ied Thread Form and Thread Ser ies for Bolts .

FED-STD-H28/3, Unif ied Threads of Special Diameter , Pi tches , and Lengths of Engagement .

FED-STD-H28/4, Control led Radius Root Screw Threads , UNJ Symbol .

FED-STD-H28/5, Unif ied Minia ture Screw Threads .

FED-STD-H28/6, Gages and Gaging for Unif ied Screw Threads .

FED-STD-H28/7, American Standard Pipe Threads (except Dryseal and Hose Coupling Types .

FED-STD-H28/8, Dryseal American Standard Pipe Threads .

FED-STD-H28/9, Gas Cyl inder Valve Out le t and Inle t Threads .

FED-STD-H28/10, American National Hose Coupling and Fire-Hose.

FED-STD-H28/11, Hose Connect ions for Welding and Cutt ing Equipment .

FED-STD-H28/12, Acme Threads .

FED-STD-H28/13, Stub Acme Threads .

FED-STD-H28/14, Nat ional Buttress Threads .

Page 109: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 97

FED-STD-H28/15, American Standard Rolled Threads for Screw Shel ls for Electr ic Lamp Holders & Unassembled Lamp Bases .

FED-STD-H28/16, Microscope Object ive and Nosepiece Threads .

FED-STD-H28/17, Surveying Ins trument Mounting Threads .

FED-STD-H28/18, Photographic Equipment Threads .

FED-STD-H28/19, Miscel laneous Threads .

FED-STD-H28/20, Inspect ion Methods for Acceptabi l i ty of UN, UNR, UNJ, M, and MJ Screw-Threads .

FED-STD-H28/21, Metr ic Screw-Thread Standards .

FED-STD-H28/22, Metr ic Screw-Thread Gages .

FED-STD-595, Colors .

QQ-B-654, Brazing Alloys , Si lver .

QQ-C-320, Chromium Plat ing (Electrodeposi ted) .

QQ-P-35, Pass ivat ion Treatments for Corrosion-Resis tant Steel .

QQ-P-416, Pla t ing, Cadmium (Electrodeposi ted) .

QQ-S-365, Si lver Pla t ing (Electrodeposi ted) , General Requirements for .

QQ-S-571, Solder , Tin Alloy, Tin-Lead Alloy, and Lead Alloy.

Safety Regulat ions 49-CFR71-78, Commerce Commission Safety Regulat ions .

10.8.3. Industrial

AGMA 390.03A-88, Gear Class if ica t ion and Inspect ion Handbook Tolerances and Measur ing Methods for Bevel , Hypoid, Fine Pi tch Wormgear ing, and Racks .

AGMA 2000-A-88, Gear Class if ica t ion and Inspect ion Handbook Tolerances and Measur ing Methods for Unassembled Spur and Helical Gears ( Including Metr ic Equivalents) .

AMS 2488, Anodic Treatment of Ti tanium and Ti tanium Alloys .

ANSI AWS A2.4-1986, Symbols for Welding and Nondestruct ive Test ing.

ANSI/ASME B1.13M-1983, Metr ic Screw Threads M Prof i le .

ANSI B1.21M-1978, Metr ic Screw Threads MJ Prof i le .

Page 110: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

98 ENGINEERING DRAWING STANDARDS MANUAL

ANSI B4.2-1978, Preferred Metr ic Limits and Fi ts .

ANSI B4.3-1978 General Tolerances for Metr ic Dimensioned Products .

ANSI B46.1-1985, Surface Texture (Surface Roughness , Waviness , and Lay) .

ANSI Y14.15-1966 (R-73) , Electr ica l and Electronics Diagrams.

ANSI Y14.15a-1971, In terconnect ion Diagrams.

ANSI Y14.15b-1973, Electr ical and Electronics Diagrams.

ANSI Y14.2M-1979, Line Convent ions and Let ter ing.

ANSI Y14.26M-1987, Digi ta l Representat ion for Communicat ion of Product Defini t ion Data .

ANSI Y14.36-1978 (R1987) , Surface Texture Symbols .

ANSI Y14.5M-1982, Dimensioning and Tolerancing.

ANSI Y14.6-1978, Screw Thread Representat ion.

ANSI Y14.6AM-1981, Screw Thread Representat ion (Metr ic Supplement) .

ANSI Y32.2-1975, IEEE STD 315-1975, CSA Z99-1975, Graphic Symbols for Electr ical and Electronics Diagrams.

ANSI Y32.9-1972, Graphic Symbols for Electr ica l Wir ing and Layout Diagrams Used in Archi tecture and Bui lding Construct ion.

ASTM D4126, Vapor Degreasing.

ASTM E380-91a, Standard Pract ice for Use of the Internat ional System of Uni ts (The Modernized Metr ic System).

ASTM E595-84, Standard Test Method for Total Mass Loss and Col lected Volat i le Condensible Mater ia ls From Outgass ing in a Vacuum Environment .

N-88-10117, Nat ional Technical Information Service—Outgass ing Data for Select ing Spacecraf t Mater ia ls .

NAS10000, NA Documents Preparat ion and Maintenance in SI (Metr ic) Uni ts .

10.8.4. Military

DOD-STD-1866, Solder ing Specif ica t ion.

Page 111: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 99

MIL-A-8625, Anodic Coat ings , for Aluminum and Aluminum Alloys.

MIL-B-7883, Brazing of Steels , Copper , Copper Alloys , Nickel Alloys , Aluminum, and Aluminum Alloys .

MIL-C-5541, Chemical Convers ion Coat ings on Aluminum and Aluminum Alloys .

MIL-C-12968, Coat ings , Phosphate , Protect ive .

MIL-C-13924, Coat ing, Oxide, Black, for Ferrous Metals .

MIL-D-5480, Data , Engineer ing and Technical , Reproduct ion Requirements for .

MIL-H-6088, Heat Treatment of Aluminum Alloys .

MIL-H-6875, Heat Treatment of Steel , Processes for .

MIL-H-7199, Heat Treatment of Wrought Copper-Beryl l ium Alloys , Process for .

MIL-HDBK-132A, Protect ive Finishes for Metal and Wood Surfaces .

MIL-I-45932/1, Inser t , Screw Thread - Thin Wall , Locked in .

MIL-L-46010, Lubricant , Sol id Fi lm, Heat Cured, Corrosion.

MIL-M-9868, Microf i lming of Engineer ing Documents , 35MM, Requirements for .

MIL-N-45938/1, Nut , Pla in , Cl inch (Self -Clinching, Round) .

MIL-O-13830, Optical Components for Fire Control Ins truments ; General Specif icat ion Governing the Manufactur ing, Assembly, and Inspect ion of .

MIL-P-116, Preservat ion, Methods of .

MIL-P-7105, Pipe Threads , Taper , Aeronaut ical Nat ional Form, Symbol ANPT, General Requirement for .

MIL-R-28002, Raster Graphics Representat ion in Binary Format , Requirements for .

MIL-S-6872, General Specif icat ion for Solder ing Process (non-electr ical) .

MIL-S-7742, Screw Threads , STD, Optimum Selected Ser ies , General Specif icat ion for .

Page 112: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

100 ENGINEERING DRAWING STANDARDS MANUAL

MIL-S-8879, Screw Threads , Control led Radius Root With Increased Minor Diameter ; General Specif icat ion for .

MIL-STD-12, Abbreviat ions .

MIL-STD-29, Drawing Requirements for Mechanical Spr ings .

MIL-STD-100, Engineer ing Drawing Pract ices .

MIL-STD-171, Finishes of Metal and Wood Surfaces .

MIL-STD-403, Preparat ion for and Ins ta l la t ion of Rivets and Screws, Rocket and Missi le Structures .

MIL-STD-00453, Radiographic Inspect ion.

MIL-STD-645, Dip Brazing of Aluminum Alloys .

MIL-STD-2154, Ultrasonic Inspect ion.

MIL-STD-2219, Fusion Welding for Aerospace Appl icat ions .

MIL-T-713, Twine, Fibrous; Impregnated, Lacing and Tying.

MIL-W-46132, Electronic Beam Welding.

MS33537, Inser t , Screw Thread, Hel ical Coi l , Coarse and Fine Thread, Standard Dimensions for .

MS51835, Inser ts and Studs , Locked In-Key Locked, Hole Dimensions for and Assembly of .

10.8.5. NASA

GSFC 731-0005-83, General Fracture Control Plan for Payloads Using the Space Transporta t ion System (STS).

GSFC-GHB-2200.2 , Scient i f ic and Technical Information Handbook.

GSFC S-250-3, Guide for the Preparat ion of Specif icat ions .

GSFC S-313-009, Fluorescent Penetrant Test Method Requirements and Guidel ines .

GSFC S-313-100, GSFC Fastener Integr i ty Requirements .

GSFC-STD-256-WE-1, For Your Information, A Compendium of General Reference Data for Technical Wri t ing and Edit ing.

GSFC X-673-64-1F, GSFC Engineer ing Standards Design Manual .

NASA Reference Publ icat ion RP-1124, November 1990, Outgass ing Data for Select ing Spacecraf t Mater ia ls .

Page 113: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 101

NHB 5300.4 (3A-l) 1976, Requirements for Soldered Electr ica l Connect ions .

NMI 80102A, Use of the Metr ic System of Measurement in NASA Programs.

NSTS 07700, System Descr ipt ion and Design Data , In tervehicular Act iv i t ies .

10.9. Standards and Specifications Numerical Index

Specif icat ion Page

AGMA 2000-A-88, Gear Class if ica t ion and Inspect ion Handbook Tolerances and Measur ing Methods for Unassembled Spur and Helical Gears ( Including Metr ic Equivalents) . 92

AGMA 390.03A-88, Gear Class if ica t ion Mater ia ls and Measur ing Methods for Bevel , Hypoid, Fine Pi tch Wormgear ing, and Racks . 92

AMS 2488, Anodic Treatment of Ti tanium and Ti tanium Alloys. 19

ANSI AWS A 2.4-86, Symbols for Welding and Nondestruct ive Test ing. 95

ANSI B1.21M-1978, Metr ic Screw Threads MJ Prof i le 95

Specif icat ion Page

ANSI B4.2-1978, Preferred Metr ic Limits and Fi ts . 89

ANSI B46.1-1985, Surface Texture (Surface Roughness , Waviness , and Lay) . 93

ANSI Y14.15-1966 (R-73) , Electr ica l and Electronics Diagrams. 43

ANSI Y14.15a-1971, In terconnect ion Diagrams. 43

ANSI Y14.15b-1973, Electr ica l and Electronics Diagrams. 43

ANSI Y14.2M-1979, Line Convent ions and Let ter ing. 35

ANSI Y14.26M-1987, Digi ta l Representat ion for Communicat ion of Product . 84

ANSI Y14.36-1978 (R 1987) , Surface Texture Symbols . 93

ANSI Y14.5M-1982, Dimensioning and Tolerancing. 1 , 7 , 16, 28, 85, 87, 107, 108

Page 114: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

102 ENGINEERING DRAWING STANDARDS MANUAL

ANSI Y14.6-1978, Screw Thread Representat ion. 95

ANSI Y14.6aM-1981, Screw Thread Representat ion (Metr ic Supplement) . 95

ANSI Y32.2-1975, IEEE STD 315-1975, CSA Z99-1975, Graphic Symbols for Electr ical and Electronic Diagrams. 43

ANSI Y32.9-1972, Graphic Symbols for Electr ica l Wir ing and Layout Diagrams Used in Archi tecture and Build ing Construct ion. 43

ANSI/ASME B1.13M-1983, Metr ic Screw Threads M Prof i le 95

ASTM D4126, Vapor Degreas ing. 20

ASTM E380-91a, Standard Pract ice for Use of the In ternat ional System of Uni ts (The Modernized Metr ic System). 86

ASTM E595-84, Standard Test Method for Total Mass Loss and Col lected Volat i le Condensible Mater ia ls From Outgass ing in a Vacuum Environment . 95

Commerce Commission Regulat ion 49-CFR71-78, Commerce Commission Safety Regulat ions . 22

Commercial and Government Ent i ty (CAGE) Publ icat ion H4/H8. 7 , 72, 75

Specif icat ion Page

DOD-STD-1866, Solder ing Specif ica t ion. 18

FED-STD-595, Colors 19

FED-STD-H28/1, Nomenclature , Def ini t ions , and Let ter Symbols for Screw Threads . 93

FED-STD-H28/2, Unif ied Thread Form and Thread Ser ies for Bolts , Screws, Nuts , Tapped Holes , and General Applicat ions . 93

FED-STD-H28/3, Unif ied Threads of Special Diameter , Pi tches , and Lengths of Engagements . 93

FED-STD-H28/4, Control led Radius Root Screw Threads , UNJ Symbol . 93

FED-STD-H28/5, Unif ied Minia ture Screw Threads . 93

FED-STD-H28/6, Gages and Gaging for Unif ied Screw Threads . 93

Page 115: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 103

FED-STD-H28/7, American Standard Pipe Threads (except Dryseal and Hose Coupling Types) . 93

FED-STD-H28/8, Dryseal American Standard Pipe Threads . 93

FED-STD-H28/9, Gas Cyl inder Valve Out le t and Inle t Threads . 93

FED-STD-H28/10, American National Hose Coupling and Fire-Hose Coupling Threads . 93

FED-STD-H28/11, Hose Connect ions for Welding and Cutt ing Equipment . 93

FED-STD-H28/12, Acme Threads . 93

FED-STD-H28/13, Stub Acme Threads . 93

FED-STD-H28/14, Nat ional Buttress Threads . 93

FED-STD-H28/15, American Standard Rolled Threads for Screw Shel ls of Electr ic Lamp Holders and for Screw Shel ls of Unassembled Lamp Bases . 93

FED-STD-H28/16, Microscope Object ive and Nosepiece Threads , 0 .800-36AMO. 93

FED-STD-H28/17, Surveying Ins trument Mounting Threads . 93

FED-STD-H28/18, Photographic Equipment Threads . 93

Specif icat ion Page

FED-STD-H28/19, Miscel laneous Threads . 93

FED-STD-H28/20, Inspect ion Methods for Acceptabi l i ty of UN, UNR, UNJ, M, and MJ Screw-Threads . 94

FED-STD-H28/21A, Metr ic Screw-Thread Standards . 94

FED-STD-H28/22, Metr ic Screw-Thread Gages . 94

GSFC 731-0005-83, General Fracture Control Plan for Payloads Using the Space Transporta t ion System (STS). 20

GSFC S-250-3, Guide for the Preparat ion of Specif ica t ions . 60

GSFC S-313-009, Fluorescent Penetrant Test Method Requirements and Guidel ines . 20

GSFC S-313-100, GSFC Fastener Integr i ty Requirements . 14

GSFC STD-256-WE-1, For Your Information—A Compendium Of General Reference Data . 12

Page 116: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

104 ENGINEERING DRAWING STANDARDS MANUAL

GSFC X-673-64-1F, GSFC Engineer ing Drawing Standards Manual . i i i , 16 , 21

MIL-A-8625, Anodic Coat ings , for Aluminum and Aluminum Alloys. 19

MIL-B-7883, Brazing of Steels , Copper , Copper Alloys , Nickel Alloys , Aluminum, and Aluminum Alloys . 18

MIL-C-5541, Chemical Convers ion Coat ings on Aluminum and Aluminum Alloys . 19

MIL-C-12968, Coat ings , Phosphate , Protect ive . 19

MIL-C-13924, Coat ing, Oxide, Black, for Ferrous Metals . 109

MIL-D-5480, Data , Engineer ing and Technical , Reproduct ion Requirements for . 83

MIL-H-6088, Heat Treatment of Aluminum Alloys . 17, 18

MIL-H-6875, Heat Treatment of Steel , Processes for . 17

MIL-H-7199, Heat Treatment of Wrought Copper-Beryl l ium Alloys , Process for . 17

MIL-HDBK-132A, Protect ive Finishes for Metal and Wood Surfaces . 92

Specif icat ion Page

MIL-I-45932/1, Inser t , Screw Thread - Thin Wall , Locked In . 21

MIL-L-46010, Lubr icant , Sol id Fi lm, Heat Cured, Corrosion.20, 109

MIL-M-9868, Microf i lming of Engineer ing Documents , 35mm, Requirements for . 83

MIL-N-45938/1, Nut , Pla in , Cl inch (Self -Clinching, Round) . 21

MIL-O-13830, Optical Components for Fire Control Ins truments ; General Specif icat ion Governing the Manufactur ing, Assembly, and Inspect ion of . 92

MIL-P-116, Preservat ion, Methods of . 21, 22

MIL-P-7105, Pipe Threads , Taper , Aeronaut ical Nat ional Form, Symbol ANPT, General Requirements for . 95

MIL-R-28002, Raster Graphics Representat ion in Binary Format , Requirements for . 83

Page 117: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 105

MIL-S-6872, General Specif icat ion for Solder ing Process (non-electr ical) . 92

MIL-S-7742, Screw Threads , STD, Optimum Selected Ser ies , General Specif icat ion for . 94

MIL-S-8879, Screw Threads , Control led Radius Root with Increased Minor . 95

MIL-STD-00453, Radiographic Inspect ion. 20

MIL-STD-12, Abbreviat ions . 12

MIL-STD-100E, Engineer ing Drawing Pract ices . 1

MIL-STD-171, Finishes of Metal and Wood Surfaces . 18, 92

MIL-STD-2154, Ultrasonic Inspect ion. 20

MIL-STD-2219, Fusion Welding for Aerospace Applicat ions . 18

MIL-STD-29, Drawing Requirements for Mechanical Spr ings . 92

MIL-STD-403, Preparat ion for and Ins ta l la t ion of Rivets and Screws, Rocket and Miss i le Structures . 18

MIL-STD-645, Dip Brazing of Aluminum Alloys 18

Specif icat ion Page

MIL-T-713, Twine, Fibrous; Impregnated, Lacing and Tying. 22

MIL-W-46132, Electronic Beam Welding. 18

MS33537, Inser t , Screw Thread, Hel ical Coi l , Coarse and Fine Thread, Standard Dimensions for . 21

MS51835, Inser ts and Studs , Locked In-Key Locked, Hole Dimensions for and Assembly of . 21

N-88-10117, Nat ional Technical Information Service—Outgassing Data Compila t ion of Spacecraf t Mater ia ls . 95

NAS10000, NA Documents Preparat ion and Maintenance in SI (Metr ic) Uni ts . 86

NASA Reference Publ icat ion, RP-1124, November 1990, Outgass ing Data for Select ing Spacecraf t Mater ia ls . 95, 108

NBS IR81-229, A Technical Brief ing on the Ini t ia l Graphics Exchange. 84

Page 118: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

106 ENGINEERING DRAWING STANDARDS MANUAL

NHB 5300.4(3A-1) 1976, Requirements for Soldered Electr ical Connect ions . 18

NMI 8010.2A, Use of the Metr ic System of Measurement in NASA Programs. 86

NSTS 07700, System Descr ipt ion and Design Data , Intervehicular Act ivi t ies . 108

QQ-B-654, Brazing Alloys , Si lver . 18

QQ-C-320, Chromium Plat ing (Electrodeposi ted) . 18

QQ-P-35, Pass ivat ion Treatments for Corrosion-Resis tant Steel . 19

QQ-P-416, Pla t ing, Cadmium (Electrodeposi ted) . 18

QQ-S-365, Si lver Pla t ing (Electrodeposi ted) , General Requirements for . 19

QQ-S-571, Solder , Tin Alloy, Tin-Lead Alloy, and Lead Alloy. 18

Safety Regulat ions 49-CFR71-78, Commerce Commission Safety Regulat ions . 22

Page 119: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 107

APPENDIX A. DESIGN REVIEW DOs AND DON'Ts

All drawings should adhere to the fol lowing guidel ines :

a . Dimension parts correct ly . Dimensioning shal l be to pr imary or mating surfaces . Unwanted bui ldup of to lerances between mat ing surfaces should be avoided. Dimensions to ins ignif icant theoret ical center l ines can resul t in mistakes by the machinis t , as wel l as the inspectors , because of the mult iple addi t ions and subtract ions required to locate the feature in re la t ion to other features . Whenever poss ible , d imensions should be lef t to r ight and bot tom to top (Quadrant I , a l l posi t ive numbers) or f rom datums establ ished by design requirements .

b . Do not detai l weldment parts separately . Since each par t may be fabr icated by a dif ferent manufacturer , the required to lerancing typical ly cannot be met , resul t ing in delays and addi t ional cost . Different par ts of a weldment should be drawn on an Inseparable Assembly Drawing (Figure 20 on page 44) so that the overal l assembly tolerancing is the responsibi l i ty of a s ingle manufacturer .

c . Implied datums are no longer al lowed. Whenever possible , se lect datums that are funct ional to the par t . A datum should a lways be ass igned to a physical surface or a feature of s ize . When using t rue posi t ion dimensioning (basic dimensions) , the dimensions f rom the feature to other edges and i ts perpendicular i ty re la t ionship to a surface must be ident i f ied with datum let ters . The combined usage of posi t ional to lerancing with plus and minus methods as re la ted to basic dimensioned pat terns is d iscont inued and replaced with the composi te to lerancing method. Refer to ANSI Y14.5M-1982, “Dimensioning and Tolerancing.”

Note:

Al though there is no requirement that a l l holes be t rue posi t ioned, i t i s preferred that hole pat terns be t rue posi t ioned, regardless of use , s ince to lerancing specif ied in the t rue posi t ion block is the control l ing factor .

d . Drawings for parts produced using templates must be properly dimensioned and toleranced. Lack of d imensioning may resul t in inadequate s t ress analysis , f i t checking, and/or inspect ion. Engineer ing and tool ing drawings should be dimensioned a l ike and re la ted to one another . Refer to tool ing required notes in “Dimension Notes ,” paragraph 2 .4 .4 .1 on page 16.

e . Use the l is t of material format correct ly . The assembly number does not get an i tem number . While the mater ia l is proper ly an i tem on the Lis t of Mater ia l , on end product drawings , there is no need to specify e i ther the drawing number or an i tem number in the Lis t of Mater ia l i f there is only one par t or mater ia l . An i tem with the same mater ia l and specif icat ion requires only one i tem number and “A/R” (as required) as a quant i ty . The var ious mater ia l s izes required are indicated on the f ie ld of the drawing, as is the case of inseparable assemblies (weldments , r iveted par ts , e tc . ) . Dash numbers are required only when there is a “shown” (odd number) and “opposi te” (even number) , when there is more than one assembly vers ion, or when the drawing is of a tabulated type ( refer to types of drawings) . Mult idetai l drawings are not a l lowed (refer to “Detai l Drawing,” paragraph 4 .3 on page 41 for explanat ion) .

Page 120: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

108 ENGINEERING DRAWING STANDARDS MANUAL

f . Do not use “SK” (short for sketch) on any drawing that is used to manufacture a part . Use only GSFC drawing numbers when us ing the GSFC drawing format; contractor drawing numbers are used on the contractor 's drawing format . The Mechanical Engineer ing Branch does not check or g ive approval for drawings produced on contractor format . Contracts should specify that the contractor shal l supply copies of company specif icat ions when using contractor formats .

g . Specify low-outgassing materials . Use low-outgass ing f i lm lubr icants for space f l ight hardware where disassembly is l ikely and/or gal l ing of l ike mater ia ls is poss ible . Refer to NASA RP-1124, November 1990 (or la ter) , Outgassing Data for Select ing Spacecraf t Materials , or to Sect ion 10, paragraph 10.6 .1 , page 95 of th is manual , “Outgass ing of Spacecraf t Mater ia ls .”

h . Specify the identi f icat ion of parts . To maintain t raceabi l i ty , a l l par ts should be ident i f ied by ink s tamping with the GSFC drawing number , ra ther than by bagging and tagging. Use only low-outgass ing ink (specify or ig inal source) and do not overcoat . Do not s teel s tamp engrave, or e tch on f l ight hardware to prevent mater ia l s t ress concentra t ions. Ident ical par ts wi th di f ferent uses should be ser ia l ized.

i . Specify the original manufacturer source of supply and complete address . Lis t the or ig inal source and complete address in the General Notes , and f lag them to the Lis t of Mater ia l or Par ts Lis t .

j . Specify regardless of feature s ize when applying to f ixed locat ions. Posi t ional to lerance should be specif ied as “Regardless of Feature Size” when applying to thread inser ts , tapped hole locat ions , and s l ip f i t des igns .

k . Specify loose tolerances where possible . The use of the t rue posi t ion method of d imensioning should not be mis taken for a t ighter to lerancing control sys tem. True posi t ion to lerancing can be as loose as the appl icat ion shal l a l low. Loose to lerances make inspect ion eas ier and a l low fewer re jected par ts .

l . Specify radi i and chamfers . Edge radi i , in-plane corner radi i , and protrus ion chamfers must be specif ied to space f l ight s tandard s ize requirements . Refer to Johnson Space Center document NSTS 07700, Volume XIV, Appendix 9 , “System Descr ip t ion and Design Data In tervehicular Act iv i t ies ,” Sect ion 5 .5 , “Crew Equipment Safety,” for s ize requirements . Specify radi i a t the bot tom of counterbores to prevent sharp corners , which could develop in to s t ress cracks , par t icular ly on f l ight par ts .

m. Specify interference range only for press f i ts . Only the amount “ .000X to .000X interference” should be s ta ted next to the i tem cal l out .

n . Specify as few reference dimensions as possible . Too many reference dimensions make checking, inspect ion, and cost es t imating more dif f icul t .

o . Specify projected tolerance zone dimensions where appl icable . Add a projected to lerance zone dimension to the t rue posi t ion to lerance when specifying threaded inser ts , tapped holes , or dowel pins . Refer to ANSI Y14.5M-1982.

Page 121: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 109

p. Specify fastener torque requirements . These requirements may refer to a project-developed specif icat ion number , or fas tener s ize and torque requirements can be tabula ted in the General Notes and f lagged to i tem cal l -outs in the f ie ld of the drawing.

q . Avoid double f ixat ions. A pat tern of countersunk holes in one par t and tapped holes in the mating par t leaves no to lerancing for e i ther par t , resul t ing in bending s t resses in the screw. I f the s i tuat ion shal l a l low, counterbore one of the par ts and use a pan head screw. I f not , dr i l l out the second par t and use a nut in place of tapped holes . Matched dr i l l ing should be avoided because of loss of in terchangeabi l i ty .

r . Avoid severe gal l ing between l ike materials . To avoid severe gal l ing in CRES-to-CRES fastener appl icat ions , consider the fo l lowing possibi l i t ies :

Use of phosphor bronze inser ts .

Use of dry f i lm lubr icant per MIL-G-46010, Lubricant , Sol id Fi lm, Heat Cured, Corros ion Inhibi t ing ( for CRES inser ts and nuts) .

Use of b lack oxide coat ing per MIL-C-13924 ( for bol ts and screws) .

s . Avoid the use of internal , external , or spl i t -r ing lock washers . These types of washers are not used on aerospace f l ight projects for several reasons; the wors t is poss ible par t icula te contaminat ion.

t . Avoid using s i lver-plated hardware around electronic appl icat ions. This can cause contaminat ion par t ic les . However , i t i s acceptable for a l l o ther appl icat ions .

u . Design a part so i t can be made with the least amount of machine setups possible .

Page 122: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

110 ENGINEERING DRAWING STANDARDS MANUAL

INDEX

For an a lphabet ical (numerical) l is t ing of the Standards and Specif icat ions l is ted in th is manual , see Sect ion 10.9 , page 101.

A

Abbrevia t ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 , 12 AFBMA .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 AGMA .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 AGMA standard qual i ty . . . . . . . . . . . . . . . . . . . . . . . 16 Al tered par ts . . . . . . . . . . . . . . . . see Par ts—Vendor Al tered vendor par t drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Drawings ANSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Archiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 ASME .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Assembly drawings . . . . . . . . . . . . . . see Drawings Associa ted l i s ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 ASTM .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 AWS .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 , 92

B

Basic dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Dimensioning—True posi t ion Brazing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

C

CAD .. . . . . . . . . . . . . . see Computer-a ided design CAD-produced drawings . . . . . . see Drawings Cer t i f ica t ion logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Chamfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Coat ing Notes . . . . . . . . . . . . . . . . . . . . . . . . . . see Notes Composi te mater ia l drawing . . . . . . . . . . . . . . . . 56 Computer-a ided design . . . . . . . . . . . . . . . . . . . 33 , 80 . . . . see also Drawings—Computer-aided design

Data f i les Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Presenta t ion of data . . . . . . . . . . . . . . . . . . . . . . . . . 80 Specif icat ion data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Computer-generated data Presenta t ion of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Configurat ion management off icer . . . . . . . . 58 Configurat ion manager . . . . . . . . . . . . . . . . . . . 58 , 80 Contractor design act ivi ty drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Drawings Convers ion of d imensions . . . . . . . . . . . . . . . . . . . 86 Cross-hatching symbol . . . . . . . . . . . . . . . . . . . . . . . . 35

D

Datum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 , 45, 82 Impl ied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Design references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 Design review Dos and Don' ts . . . . . . . . . . . . 104 Design Select ion Guide . . . . . . . . . . . . . . . . . . . . . . . . 14 Detai l drawings . . . . . . . . . . . . . . . . . . . see Drawings Detai ls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Ident i f icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Locat ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Diagrams Electr ical and e lect ronic . . . . . . . . . . . . . . . . . . . 43

Dimension notes . . . . . . . . . . . . . . . . . . . . . . . .see Notes Dimensional to lerance notes . . . . . . .see Notes Dimensioning

Metr ic . . . . . . . . . . . . . see Metr ic d imensioning Sta tements on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 True posi t ion . . . . . . . . . . . . . . . . . . . . 82 , 104, 105

Dimensioning and to lerancing . . 82, 84, 104 Metr ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Pract ices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 , 16, 24, 25, 28, 55, 82, 84, 88, 104

Convers ion of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Projected to lerance zone . . . . . . . . . . . . . . . . . 106 Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Documentat ion management . . . . . . . . . . . . . . . . . . 79 Double f ixat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Draf t ing pract ices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Drawing e lements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Drawing f low char t . . . . . . . . . . . . see F low char t Drawing format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Drawing Interchange Fi le . . . . . . . . . . . . . . . . . . . . . 81 Drawing notes . . . . . . . . . . . . . . . . . . . . . . . . . . .see Notes Drawing number . . . . . . . . . . 1 , 7 , 10, 41, 58, 60

Source control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Specif icat ion control . . . . . . . . . . . . . . . . . . . . . . . . 54

Drawing revis ions . . . . . . . . . . . . . . . see Revis ions Drawing s izes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Drawing t i t le . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Drawing t ree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Drawings

Archiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 , 53, 54 CAD-produced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Computer-a ided design . . . . . . . . . . . . . . . . . . . . . . 80

Page 123: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 111

Developing and us ing . . . . . . . . . . . . . . . . . . . . 81 Revis ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Contractor design act ivi ty . . . . . . . . . . . . . . . . . . 1 Detai l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Electr ical /Elect ronic . . . . . . . . . . . . . . . . . . . . . . . . 43 Engineer ing . . . . . . . . . . . . . . . . . . . . 1 , 16, 58, 104 Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Government Design Act ivi ty . . . . . . . . . . . . . . . 1 Inseparable assembly . . . . . . . . . . . . . . . . . . . . . . . 44 Ins ta l la t ion assembly . . . . . . . . . . . . . 45, 53, 54 Interface control . . . . . . . . . . . . . . . . . . . . . . . . . 46 , 47 Manufactur ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Matched-set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Mechanical schemat ic . . . . . . . . . . . . . . . . . . . . . . 49 Modif icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Monodetai l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Mult ideta i l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Mult isheet . . . . . . . . . . . . . . . . . . . . 3 , 4 , 15, 38, 65 Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Notes Numbering system . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 One view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Out l ine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 , 51, 54 Penci l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Posi t ioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Redrawn or replaced . . . . . . . . . . . . . . . . . . . . . . . . 67 Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Source control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 , 53 Specif icat ion control . . . . . . . . . . . . . . 52, 53, 54 Standard par t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Tabulated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Three view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Tool ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 , 55, 104 Two view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Types of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Vendor par t

Al tered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Selected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Zoned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 , 38 DXF . . . . . . . . . . . . see Drawing Interchange Fi le

E

Electr ical and electronic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Diagrams Electr ical and electronic symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Symbols Electr ical /e lectronic drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Drawings Engineer ing drawings . . . . . . . . . . see Drawings Engineer ing order . . . . . . . . . . . . . . . . . . . . . . . . . . 62 , 64

APPROVED .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Archiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 DESCRIPTION .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Disposi t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 DRAWING .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

EFFECTIVE SERIAL . . . . . . . . . . . . . . . . . . . . . . . . 63 EO NO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Format sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 General requirements . . . . . . . . . . . . . . . . . . . . . . . . 62 INITIATED .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 ISSUED BY .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 NEXT ASSEMBLY .. . . . . . . . . . . . . . . . . . . . . . . . . . 62 Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 PARTS IN PROCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Engineer ing order—Disposi t ion PROGRAM .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 REASON .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 REV .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 REVIEWED .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 SHEET___OF___ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 TITLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 TYPE OF EO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 USED ON .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Engineer ing par ts l i s t . . . . . . . . . . . see Par ts l i s t EO . . . . . . . . . . . . . . . . . . . . . . . . . see Engineer ing order EPL . . . . . . . . . . . . . . . . see Par ts l is t—Engineer ing

F

Fastener torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Federal Cataloging Program . . . . . . . . . . . . . . . . . 54 Federal I tem Ident i f icat ion Number . . . . . . . 54 Federal s tandards and specif icat ions . . . . . . 93 FIIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Federal I tem Ident i f icat ion Number Find number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Appl icat ion and l imita t ion . . . . . . . . . . . . . . . . . 76 Defini t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Drawing requirements . . . . . . . . . . . . . . . . . . . . . . . 77 System of ident i f icat ion . . . . . . . . . . . . . . . . . . . . 76

Find or I tem number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see ei ther F ind number or I tem number Find or i tem numbering . . . . . . see Numbering Flow char t

For drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

G

Gall ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Government Design Act ivi ty Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Drawings

H

Heat t reat ing notes . . . . . . . . . . . . . . . . . . . .see Notes

I

IEEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 IGES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page 124: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

112 ENGINEERING DRAWING STANDARDS MANUAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . see In i t ia l Graphics . . . . . . . . . . . . . . . . . . . . . . . . Exchange Specif icat ion IL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Index l is t Index l i s t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Cont inuat ion sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Entr ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Cover sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Entr ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 , 70 Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Defini t ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Requirements

Adding i tems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Delet ing i tems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Lis t formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Lis t preparat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Revis ion ident i f icat ion . . . . . . . . . . . . . . . . . . 69

Industr ia l s tandards and specif icat ions . . 95 Informat ion Management Divis ion . . . . . . . . 58 Informat ional notes . . . . . . . . . . . . . . . . . . see Notes In i t ia l Graphics Exchange Specif icat ion 81 Ink l ines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Lines Inseparable assembly drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Drawings Inseparable par ts . . . . . . . . . . . . . . . . . . . . . . . see Par ts Ins ide rounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Metr ic d imensioning— . . . . . . . . . . . . . . . . . . . . . . . . . . . Rounding—Precis ion Inspect ion notes . . . . . . . . . . . . . . . . . . . . . . . see Notes Ins ta l la t ion assembly drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Drawings Interface control drawings . . . . see Drawings Interference range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Internat ional System of Uni ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 . . . . . . . . . . . . . . . . . . . . . . see also 'SI ' and 'Metr ic ' In t roduct ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ISO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 I tem number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Appl icat ion and l imita t ion . . . . . . . . . . . . . . . . 76 Defini t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Drawing requirements . . . . . . . . . . . . . . . . . . . . . . 77 System of ident i f icat ion . . . . . . . . . . . . . . . . . . . 76

I tem numbering . . . . . . . . . . . . . . . . . see Numbering

J

J rol l s ize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Joining method notes . . . . . . . . . . . . . . . . see Notes

L

Lay (of a surface) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 Let ter ing and Numerals . . . . . . . . . . . . . . . . . . . . . . . 31

Heights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Library Services Branch . . . . . . . . . . . . . . . . . . . . . . . 58 Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Convent ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 , 27 Ink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Penci l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Plot ted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 , 27

Break . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Cut t ing-plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Datum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Hidden . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Leaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Out l ines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Phantom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Sect ioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 St i tch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Viewing-plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Vis ible . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Lis t of Mater ia l . . . . . . . . . . . . . . . . . . . . . . . . . 8 , 10, 14 Entr ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 , 104 Requirements in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

LM .. . . . . . . . . . . . . . . . . . . . . . . . . . see Lis t of Mater ia l Local character notes . . . . . . . . . . . . . . . . .see Notes Lock washers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Low-outgass ing mater ia ls . . . . . . . . . . . . . . . . . . . 105

M

Matched-set drawings . . . . . . . . . . see Drawings Mater ia l

Convent ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Low-outgass ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Outgass ing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Mechanical Engineer ing Branch . . . . . . . . . . . . 58 Mechanical schemat ic diagram drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Drawings Metr ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see also SI Metr ic d imensioning

Rounding Basic dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 General ru les . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Precis ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 , 89 Toleranced dimensions . . . . . . . . . . . . . . . . . . . 88

Uni t convers ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Metr ic system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Mil i tary s tandards and specif icat ions . . . . . 96 Modif icat ion drawings . . . . . . . . . see Drawings Mult isheet drawings . . . . . . . . . . . . see Drawings

Page 125: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 113

N

NAS .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 NASA standards and specif icat ions . . . . . . 98 Nat ional Bureau of Standards index . . . . . . 93 NEMA .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Coat ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Dimensional to lerance . . . . . . . . . . . . . . . . . . . . . . 24 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Heat t reat ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Informat ional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Inspect ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Joining method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Local character . . . . . . . . . . . . . . . . . . . . . . . . . . 15, 23 Locat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Miscel laneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Numbering of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Pla t ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Surface preparat ion . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Test ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Threaded inser ts

Cleaning and ins ta l la t ion . . . . . . . . . . . . . . . 21 Warning note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

NSA .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 NTIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Find . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 I tem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Par ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Numbering of notes . . . . . . . . . . . . . . . . . . see Notes

O

Order of precedence. . . . . . see Specif icat ions Orthographic project ion . . . . . . . . . . . . . . . . . . . . . . 25 Outgass ing

Low-outgass ing mater ia ls . . . . . . . . . . . . . . . . 105 Of spacecraf t mater ia ls . . . . . . . . . . . . . . . . . . . . 93

Out l ine drawings . . . . . . . . . . . . . . . . . see Drawings Outl ines

Invis ible . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Vis ible . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

P

Part number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 , 59 Par t Posi t ioning . . . . . . . . . . . . . . . see Posi t ioning Par ts

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 Ident i f ica t ion of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Inseparable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Separable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Vendor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 , 53, 59

Al tered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 , 59 Selected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39, 59

Weldment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 Par ts l i s t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14, 68

Cont inuat ion sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Entr ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Supplementary heading l is t . . . . . . . . . . . . . 73

Cover sheet Entr ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 , 70 Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Defini t ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Engineer ing . . . . . . . . . . . . . . . . . . . . . . . . . . 59 , 60, 80 Preferred . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Requirements

Adding i tems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Delet ing i tems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Lis t formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Lis t preparat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Revis ion ident i f icat ion . . . . . . . . . . . . . . . . . . . 69

Penci l drawings . . . . . . . . . . . . . . . . . . see Drawings Penci l l ines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Lines Pic tur izat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 PL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Par ts l i s t Pla t ing notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .see Notes Plot ted l ines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Lines Posi t ioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 , 35 Precis ion rounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Metr ic d imensioning—Rounding Press f i t s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Projected to lerance zone . . . . . . . . . . . . . . . . . . . . 106 Projected views . . . . . . . . . . . . . . . . . . . . . . . . see Views

R

Radi i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Regardless of Feature Size . . . . . . . . . . . . . . . . . 105 Revis ion block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 , 9 , 65

APPROVAL .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 DATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 DESCRIPTION.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 , 66 SYM .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 ZONE .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Revis ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Ident i f icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Mult isheet drawings . . . . . . . . . . . . . . . . . . . . . . . . . 65 Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Redrawn or replaced drawings . . . . . . . . . . . 67

Rotated views . . . . . . . . . . . . . . . . . . . . . . . . . . see Views Rounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Page 126: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

114 ENGINEERING DRAWING STANDARDS MANUAL

Rounding: . . . . see also Metr ic d imensioning

S

SAE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Sect ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Ident i f icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Locat ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Secur i ty c lass i f icat ion . . . . . . . . . . . . . . . . . . . 10, 15 Selected par ts . . . . . . . . . . . . . . see Par ts—Vendor Selected vendor par t drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Drawings Separable par ts . . . . . . . . . . . . . . . . . . . . . . . . . see Par ts Sheet numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 SI . . . see also In ternat ional System of Uni ts

Uni ts and symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Si lver-pla ted hardware . . . . . . . . . . . . . . . . . . . . . . . 106 Solder ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 , 89 Source control drawings . . . . . . . see Drawings Space Transporta t ion System . . . . . . . . . . . . . . . 20 Specif icat ion cal louts . . . . . . . . . . . . . . . . . . . . . . . . . 24 Specif icat ion control drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Drawings Specif icat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Order of precedence . . . . . . . . . . . . . . . . . . . . . . . . . 60 Subsequent changes . . . . . . . . . . . . . . . . . . . . . . . . . 24 Thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 , 92

Specif icat ions index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see S tandards and specif icat ions index Standard par t drawing . . . . . . . . . . see Drawings Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Order of precedence . . . . . . . . . . . . . . . . . . . . . . . . . 60 Standards and specif icat ions index . . . . . . . 93

Federal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Industr ia l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 Mil i tary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 NASA .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 Nat ional Bureau of Standards . . . . . . . . . . . . 93

Standards and specif icat ions numerical index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

STS . . . . . . . see Space Transporta t ion System Suppor t ing documentat ion

Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Surface preparat ion notes . . . . . . . . . . see Notes Surface roughness

Control of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 Surface texture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Symbols Cross-hatching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Electr ical /Elect ronic . . . . . . . . . . . . . . . . . . . . . . . . 43 Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Wir ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

T

Tabulated drawings . . . . . . . . . . . . . see Drawings Templates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 , 82, 104 Test ing notes . . . . . . . . . . . . . . . . . . . . . . . . . . . .see Notes Third-angle or thographic project ion . . . . . . 25 Thread specif icat ions . . . . . . . . . . . . . . . . . . . . . 91, 92 Threaded inser ts—Cleaning and

ins ta l la t ion notes . . . . . . . . . . . . . . . . . . . .see Notes Ti t le b lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 , 9 , 32, 33

APPROVED .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CHECKED .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CODE .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 DATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 DESCRIPTION.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 DESIGNER .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Drawing No. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 DRAWN .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 EXAMINATION .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 FLIGHT HARDWARE .. . . . . . . . . . . . . . . . . . . . . . . 8 HARDNESS TESTING .. . . . . . . . . . . . . . . . . . . . . . 8 ITEM NO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 MATERIAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 MATERIAL SPEC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 METRIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 NEXT ASSY .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 PART NO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 REQD .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 SH___OF___ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Sof tware used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 TITLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 USED ON .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 WT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Tolerance Block Metr ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Tolerances . . . . . . . . . . . . . . . . . . 24 , 82, 84, 88, 104 Loose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Metr ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Tolerancing True posi t ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Tool ing drawings . . . . . . . . . . . . . . . . see Drawings Tool ing f ix tures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Transpor ted views . . . . . . . . . . . . . . . . . . . . see Views True posi t ion dimensioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Dimensioning

U

Unit number pr inciple . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Uni t rounding . . . . . . . . . . . . . . . . . . . . . see Rounding

Page 127: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

ENGINEERING DRAWING STANDARDS MANUAL 115

V

Vapor degreasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Vendor par t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Par ts Vendor par t drawings . . . . . . . . . . . see Drawings Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 , 36

Ident i f icat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Locat ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Projected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Rotated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Sect ional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Designat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Posi t ioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Transpor ted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

W

Waviness (of a surface) . . . . . . . . . . . . . . . . . . . . . . . 90 Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Specif icat ion cal louts . . . . . . . . . . . . . . . . . . . . . . . 92 Symbols . . . . . . . . . . . . . . . . . . . . . see also Symbols

Locat ion s ignif icance . . . . . . . . . . . . . . . . . . . . 92 Weldments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 , 104 Wir ing symbols . . . . . . . . . . . . . . . . . . . . see Symbols

Z

Zoning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 , 10

Page 128: Engineering Drawing Standard Manual

X-673-64-1F REV 001 DEC. ‘94 GODDARD SPACE FLIGHT CENTER, Greenbel t , Maryland

116 ENGINEERING DRAWING STANDARDS MANUAL