Jis.b.2408.e.2005 O-Rings Acceptance Criteria

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JIS B 2408 (2005) (English): O-Rings: Quality

Acceptance Criteria


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JIS B 2408: 2005CJFPA/JSA)

JAPANESEINDUSTRIALSTANDARD

Translated and Published byJapanese Standards Association

O-rings-Quality acceptance criteria

S B2408-2005(EN) (1) I" III "111111" III61110000052Ie s 23.100.60; 83.140.50Reference number : JIS B 2408 : 2005 (E)

PROTECTED BY COPYRIGHT 8S


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B 2408: 2005

ForewordThis translation has been made based on th e original Japanese IndustrialStandard revised by the Minister of Economy, Trade and Industry throughdeliberations at th e Japanese Industrial Standards Committee, as th e resultof proposal for revision of Japanese Industrial Standard submitted by JapanFluid Power Association (JFPA)/Japanese Standards Association (JSA) withthe draft being attached, based on th e provision of Article 12 Clause 1 ofth e Industrial Standardization Law applicable to the case of revision by theprovision of Article 14.Consequently JIS B 2408 : 1993 is replaced with this Standard.This revision has been made based on ISOIFDIS 36013: 2002 Fluid powersystems-O-rings-Part 3: Quality acceptance criteria for the purpose ofmaking it easier to compare this Standard with International Standard; toprepare Japanese Industrial Standard conforming with InternationalStandard; and to propose a draft of an International Standard which is basedon Japanese Industrial Standard.Attention is drawn to the possibility that some parts of this Standardmay conflict with a patent right, application for a patent after opening toth e public, utility model right or application for registration of utility modelafter opening to the public which have technical properties. The relevantMinister and the Japanese Industrial Standards Committee are notresponsible for identifying the patent right, application for a patent afteropening to the public, utility model right or application for registrationof utility model after opening to the public which have th e said technicalproperties.

Date of Establishment: 1993-02-01Date of Revision: 2005-03-20Date of Public Notice in Official Gazette: 2005-03-22Investigated by: Japanese Industrial Standards Committee

JSA 2006

Standards BoardTechnical Committee on Machine Elements

JIS B 2408: 2005, First English edition published in 2006-08

Translated and published by: Japanese Standards Association4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPANIn the event of any doubts arising as to the contents,

th e original JIS is to be the final authority.

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced orutilized in any form or by any means, electronic or mechanical, including photocopying an dmicrofilm, without permission in writing from the publisher.Printed in Japan FM/AT

PROTECTED BY COPYRIGHT

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B 2408: 2005Contents

PageIntroduction ................................................................................................................. 11 Scope .............................. .................................. .................................. .................. 12 Normative reference.......................................................................................... 13 Terms and definitions ....................................................................................... 13.1 backrind............................................................................................................. 13.2 combined flash ................................................................................................. 13.3 excessive trimming .......................................................................................... 13.4 flash ................................................................................................................... 23.5 flow marks ........................................................................................................ 23.6 foreign material ............................................................................................... 23.7 indentations ...................................................................................................... 23.8 mismatch ........................................................................................................... 23.9 non-fills.............................................................................................................. 23.10 off register ..................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.11 offset .................................................................................................................. 23.12 parting line indentation ................................................................................. 23.13 parting line projection .................................................................................... 24 Symbols ............................................................................................................... 25 Grades ................................................................................................................. 25.1 Grade N (general) ............................................................................................ 25.2 Grade S (special)... ............. .............. ............. ............. .............. ............. ........... 26 Surface condition ............................................................................................... 37 Identification statement (reference to this Standard) ................................ 3Annex (informative) Comparison table between JIS and correspondingInternational Standard ...................................................... 8

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JAPANESE INDUSTRIAL STANDARD JIS B 2408 : 2005

O-ring-Qual i ty acceptance cri ter ia

Introduction This Japanese Industrial Standard has been prepared based on thefirst edition of ISOIFDIS 3601-3 Fluid power systems-O-rings-Part 3: Quality ac-ceptance criteria published in 2002 with some modifications of the technical contents.The portions given sidelines or dotted underlines are the matters modified from

the original International Standard. A list of modifications with the explanations isgiven in Annex (informative).1 Scope This Standard defines and classifies surface imperfections on O-rings andspecifies maximum acceptable limits for these imperfections.

Remarks 1 This Standard only specifies the visual quality acceptance criteriaof O-rings and is not intended to be used, by itself, to evaluate theconformity of O-rings.

2 The International Standard corresponding to this Standard is as follows.In addition, symbols which denote the degree of correspondence in

th e contents between the relevant International Standard and JIS areIDT (identical), MOD (modified), and NEQ (not equivalent) accordingto ISOIIEC .Guide 21.ISO/FDIS 3601-3: 2002 Fluid power systems-O-rings-Part 3: Qual-

it y acceptance criteria (MOD)2 Normative reference The following standard contains provisions which, throughreference in this text, constitute provisions of this Standard. I f the indication of theyear of publication is given to the referred standard, only the edition of th e indicatedyear constitutes the provision of this Standard but the revision and amendment madethereafter do not apply. The normative reference without the indication of the yearof coming into effect applies only to the most recent edition (including amendments).

JIS B 0142 Glossary of terms for oil hydraulics and pneumaticsNOTE: IS O 5598: 1985 Fluid power systems and components-Vocabulary is

equivalent to the said standard.3 Terms and definitions For the purposes of this Standard, the terms and definitions given in JIS B 0142 and the following apply.3.1 backrind longitudinal imperfection in which the rubber adjacent to the flashline shrinks below the level of the moulding and has a U-like or W-like cross sectionwith the flash frequently being ragged or torn ~ ~ ~ . ~ .. ~ g ~ ~ ~ } )3.2 combined flash combination of offset, flash and parting line projection3.3 excessive t r imming flattened and often roughened area around the innerand/or outer diameters of an O-ring, caused by th e trimming process (see figures 2Aand 2B) ............................ .

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2B 2408: 2005

3.4 flash film-like material which extends from the parting line projection or in ner and/or outer diameters, caused by mould separation or present due to inadequatetrimming ~ ~ ~ . ~ .. ~ ~ . 1 : 1 : ! ~ } )3.5 flow marks thread-like recesses, usually curved, or very slight depth in th eunflexed state, with normal surface texture and round edge, caused by incompleteflow and knit of the material ( ~ ~ ~ . J ! : g ~ . ! ' . ~ . ~ 23.6 foreign material any extraneous matter embedded in the surface of th e 0-ring such as contamination and dirt3.7 indentations depressions, usually irregular in form, caused by th e removalof inclusions from the surface or the build up of hardened deposits on th e surface ofthe mould cavity ~ ! ? ~ . ~ . J ~ ~ ~ ! : ~ . l

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3.8 mismatch cross-sectional radius in one ring half being unequal to that of theother half, caused by dimensional difference in mould halves \ ~ ~ ~ J ~ g ~ E ~ . ? ) . (3.9 non-fills randomly spaced, irregularly shaped surface indentations having acoarser texture than the normal O-ring surface ~ ~ ~ ~ .. ~ g ~ . ~ . ~ . ~ 2

Information: This is caused by incomplete filling of the mould cavity and byentrapment of air.

3.10 off regis ter misalignment of O-ring halves, caused by the lateral shift ofone mould cavity plate relative to other ( ~ ~ ~ J ~ . ~ ~ . ~ ~ .. ').3.11 offset mismatch and/or off register of O-ring halves ( ~ ~ . ~ . t } ~ ~ ! : ~ . 1 )3.12 part ing line indentat ion shallow saucer-like recess sometimes triangularin shape, located on the parting line at the inner and/or outer diameters, caused bydeformation of the mould edge at the parting line3.13 part ing line projection continuous ridge of material situated at the parting line of inner and/or outer diameters caused by worn or excessively rounded edgesof the mould cavity4 Symbols The following symbols are used in this Standard:

d 1 O-ring inside diameter;d2 O-ring cross-section diameter.

5 Grades5.1 Grade N (general) This grade identifies acceptance criteria for O-rings intendedfor general usage applications.5.2 Grade S (special) This grade identifies acceptance criteria for O-rings intendedfor applications requiring a higher level of quality/precision with respect to dimensionaltolerances o f surface imperfections.

For example, aerospace applications are covered by this grade.


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6 Surface condit ion

3B 2408: 2005

6.1 The a-ring surfaces shall be free from cracks, ruptures, blisters or other imperfections for which the limits are greater than those given in attached table 1 whenthe unstretched ring is viewed under a x 2 illuminated magnifier viewer. Other methodsmay be used by agreement between the manufacturer and the user.6.2 There shall be no foreign material embedded in the surface visible under theviewing conditions of 6.1.6.3 Flow marks, non-fills and indentations within the limits of attached table 1 shallnot be allowed ifa) there are more than three in any 25 mm length of circumference;b) they interconnect;c) there are more than three which are separated from each other by a distance

which is less than th e maximum limiting dimensions of such imperfection.6.4 There shall be no flow marks which are essentially radially orientated.6.5 The surface resulting from any excessive trimming shall be smoothly blended.7 Identification sta tement (reference to this Standard) Manufacturers arestrongly recommended to use th e following statement in test reports, catalogues andsales literature when electing to comply with this Standard.

"Surface imperfection limits are in accordance with J IS B 2408 O-rings-Quality acceptance criteria".



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Surfaceimperfectiontype

Offmismatch. (offset)

Combinedflash(combinationofflash andparting lineprojection)

Backrind

Excessivetrimming(radial toolmarks notallowed)

Attached Table 1 Limits of size for surface imperfections

Diagrammatic representation

~ ~Mismatch Mismatch

J h ~~ t ) ) 1~ T

b~ /~ n

~ ,

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Limitingdimension

e

f

a

g

h

11

b

Maximum limits of imGrade N O-rings with cross section d2:;;;1.8 ~ 2 ~ ~ I ~ ~ ~ I ~ ~ ~ ; 5.3


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Diagrammatic representation

!2

Notes (1) Or 0.05 db whichever is greater.

->::

Limitingdimension

j

k

In

Or 0.03 db whichever is greater, subject to a maximum of 30 mi l l .

Grade N O-rings with cross section d2;:;;;1.8 1.8< 12.65< 13.55


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6B 2408: 2005

Figure 1

Figure 2A Excessive trimming-Permitted

Permitted if no texceeding th especified limit.

Backrind

Figure 2B Excessive trimming-No t permitted

Permitted if no texceeding th especified limit.

Figure 3 Flash


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Radially orientedflow marks arenot permitted.Permitted if notexceeding thespecified limit.

Figure 4 Flow marks

Permitted if notexceeding thespecified limit.

Figure 6 Non-fills

7B 2408: 2005


Figure 5 Indentat ions due tomould contamination


Figure 7 Off register/mismatch/offset



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Annex (informative)Comparison table between JIS and corresponding Internat ion

JIS B 2408: 2005 O-rings-Quality acceptance criteria ISOIFDIS 36013: 2002 FP(n Requirements in JIS (II) Inter- (III) Requirements in (IV) Classification and detanational International Standard technical deviation between

Standard and the International Standnumber by clauseLocation of deviation: textIndication method: dotted ulines or continuous sideline

Clause Content Clause Content Classifi- Detail of technication by deviationclause1 Scope Specifies the acceptance ISOIFDIS 1 Specifies the quality MODI JIS applies to a

criteria for visual quality 36013 acceptance criteria of addition of diamof O-rings. O-rings, th e dimensions not I'ln::1::ll>ta thanof which are specified Smm.in ISO 36011.

2 Normative JIS B 0142 2 ISO 3601-1 IDTreferences ISO 55983 Terms and Definitions of 13 terms and 3 Definitions of 13 terms MODI Fi"l.u",,, from ISdefinitions those specified in JIS B and those specified in alteration FDIS 3601-3: 20142. ISO 5598. are referenced.

1 to 7. Figures 1 to 9.4 Symbols Two symbols, d 1 and d 2 are 4 Identical with JIS. IDTspecified.5 Grades GradeN 5 Identical with JIS. IDT

Grade S- - - - - - - - - -

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( l) Requirements in JIS (II) Inter- ( I I I) Requirements in (IV) Classification and detanational International Standard technical deviation betweenStandard and the International Standnumber by clauseLocation of deviation: text

Indication method: dotted ulines or continuous sidelineClause Content Clause Content Classifi- Detail of technication by deviationclause

------6 Surface Specifies acceptable limits 6 Identical with JIS. IDTcondition and other conditions forsurface imperfections.7 Identification Reference to this Standard. 7 Identical with JIS. IDTstatement

L J " ' ' ' ! 5 ' ' a . ~ " u degree of correspondence between JIS and International Standard: MODRemarks 1 Symbols in sub-columns of classification by clause in the above table indicate as fo

IDT: Identical in technical contents.MOD/addition: Adds specification item(s) or content(s) which ar e not includedMOD/alteration: Alters the specification content(s) which are included in Inte

2 Symbol in column of designated degree of correspondence between JIS and Internatitable indicates as follows:- MOD: Modifies International Standard.


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Errata for JIS (English edition) are printed in Standardization Journal, published monthly bythe Japanese Standards Association, and also provided to subscribers of JI S (English edition) in1110nthly Information.Errata will be provided upon request, please contact:Standards Promotion Department, Japanese StandardsAssociation4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPANTEL. 03-3583-8002 FAX. 03-3583-0462



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Jis.b.2408.e.2005 O-Rings Acceptance Criteria