Instructor:Instructor:

James ThornburghJames Thornburgh

Unit 2Unit 2Threaded FastenersThreaded Fasteners

Unit 2Unit 2Threaded FastenersThreaded Fasteners

Bring up your Homework & Put on TableBring up your Homework & Put on Table

ObjectivesObjectives Define keywords related to Threaded Define keywords related to Threaded

FastenersFasteners List the three classes of fitList the three classes of fit Describe the differences between course, Describe the differences between course,

fine, and extra fine threadsfine, and extra fine threads Describe the difference between single Describe the difference between single

and multiple thread fastenersand multiple thread fasteners List the common information contained in List the common information contained in

a thread notea thread note

ObjectivesObjectives List and identify three different methods to List and identify three different methods to

graphically represent threadsgraphically represent threads Identify and draw different types of screwsIdentify and draw different types of screws Describe the difference between rivets and Describe the difference between rivets and

screwsscrews Draw pipe threads, hex and square bolts Draw pipe threads, hex and square bolts

and nutsand nuts Use thread tables to specify or draw Use thread tables to specify or draw

threaded fastenersthreaded fasteners

What are Threaded What are Threaded FastenersFasteners

ScrewsScrews TerminologyTerminology

Thread FormsThread Forms

Class of fitClass of fit 11

Loose fitLoose fit For quick assemblyFor quick assembly

22 High QualityHigh Quality General purposeGeneral purpose

33 Very High QualityVery High Quality High Precision, stress, or vibrationHigh Precision, stress, or vibration

Thread PitchThread Pitch Determines how far a Fastener goes Determines how far a Fastener goes

with each revolutionwith each revolution

Thread NotesThread Notes

Metric Thread NoteMetric Thread Note Pitch is Distance in mmPitch is Distance in mm

Thread GradesThread Grades

Thread TableThread Table

http://www.littlemachineshop.com/Reference/tapdrill.phphttp://www.littlemachineshop.com/Reference/tapdrill.php

Drawing ThreadsDrawing Threads DetailedDetailed

Show detailed thread formShow detailed thread form Time ConsumingTime Consuming Rarely used Rarely used

SchematicSchematic Easier than DetailedEasier than Detailed

SimplifiedSimplified Easiest to drawEasiest to draw Used most oftenUsed most often

Pipe ThreadsPipe Threads Why are they at an angle?Why are they at an angle?

Fastener TypesFastener Types BoltBolt

Hex or Square HeadHex or Square Head Used with a nut to Used with a nut to

Squeeze parts Squeeze parts StudStud

Threaded into a PartThreaded into a Part Attached second Attached second

part with a nutpart with a nut Cap ScrewCap Screw

Longer than a boltLonger than a bolt Threaded to the Threaded to the

headhead Threads into partThreads into part

Fastener TypesFastener Types Cap ScrewCap Screw

Can have Socket Can have Socket HeadHead

Machine ScrewMachine Screw Smaller than Cap Smaller than Cap

ScrewScrew Many different head Many different head

StylesStyles Set ScrewSet Screw

With or without a With or without a headhead

Used to keep parts Used to keep parts stillstill

Square BoltSquare Bolt

.5” dia Sq Hd Bolt

Hex BoltHex Bolt

1” dia Hex Hd Bolt

Making Nuts and BoltsMaking Nuts and Bolts

Machine Screw HeadsMachine Screw Heads

Screw Drive TypeScrew Drive Type

Other ScrewsOther Screws ShoulderShoulder

Self TappingSelf Tapping

WoodWood

ReferencesReferences http://www.mcmaster.comhttp://www.mcmaster.com http://www.boltscience.com/http://www.boltscience.com/ http://www.Barnhillbolt.comhttp://www.Barnhillbolt.com http://www.fastenal.comhttp://www.fastenal.com

Lab Assignments & Lab Assignments & HomeworkHomework

LabLab HandoutHandout Workbook 17.1, 17.2 inst. On Pg 10Workbook 17.1, 17.2 inst. On Pg 10 Prob 17.2, 17.8Prob 17.2, 17.8

HomeworkHomework Chapter Questions 1-17Chapter Questions 1-17 Online Multiple Choice QuizOnline Multiple Choice Quiz