BS 919-1-2007 Screw gauge limits and tolerances. S

BS919-1:2007Screwgaugelimitsandtolerances–Part1:SpecificationforgaugesforscrewthreadsofunifiedformICS21.040.30NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWBRITISHSTANDARDLicensedCopy:LondonSouthBankUniversity,LondonSouthBankUniversity,WedDec0514:56:55GMT+00:002007,UncontrolledCopy,(c)BSIPublishingandcopyrightinformationTheBSIcopyrightnoticedisplayedinthisdocumentindicateswhenthedocumentwaslastissued.©BSI2007ISBN9780580579332ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceTDW/4Draftforcomment07/30158512DCPublicationhistoryFirstpublishedApril1952Secondedition,December1960Thirdedition,November2007AmendmentsissuedsincepublicationAmd.no.DateTextaffectedBS919-1:2007LicensedCopy:LondonSouthBankUniversity,LondonSouthBankUniversity,WedDec0514:56:55GMT+00:002007,UncontrolledCopy,(c)BSI©BSI2007•iBS919-1:2007ContentsForewordiii1Scope12Normativereferences13Termsanddefinitionsandsymbols14Design25Tolerancesandthreadforms36Marking25AnnexesAnnexA(informative)VerifyingconformitywithBS158026AnnexB(informative)Conventionalillustrationoftolerancezones34AnnexC(informative)Effectivediameterequivalentofpitchandangleerrors34AnnexD(informative)Asystemofgaugingforscrewthreadsbeforeandaftercoating37AnnexE(informative)Settingtosizeofadjustablescrewringgauges40AnnexF(informative)ComparisonbetweenthedesignationsofBritishandAmericangauges42AnnexG(informative)Tolerancesformajor,effectiveandminordiametersandflankangleandpitch43AnnexH(informative)Hardness44Bibliography45ListoffiguresFigure1–Dispositionofeffectivediametertolerancezonesforscrewgauges18Figure2–ThreadformsofGOgauges20Figure3–ThreadformsofNOTGOgauges21Figure4–FormsofthreadforNOTGOeffectivediameterscrewgauges22Figure5–Threadformsofsettingplugs24FigureB.1–Limitsandtolerancesfortheeffectivediametersofinternalandexternalthreads34ListoftablesTable1–TolerancesforGOscrewpluggauges–allclasses5Table2–TolerancesforNOTGOscrewpluggauges–allclasses6Table3–TolerancesforGOandNOTGOplainpluggaugesforminordiameters7Table4–TolerancesforGOscrewringgauges–solidtype,allclasses7Table5–TolerancesforNOTGOeffectivediameterscrewringgauges–solidtype,allclasses8Table6–TolerancesforGOscrewcheckplugsforGOscrewringgauges–solidtype8Table7–TolerancesforNOTGOeffectivediametercheckplugsfornewGOscrewringgauges–solidtype9LicensedCopy:LondonSouthBankUniversity,LondonSouthBankUniversity,WedDec0514:56:55GMT+00:002007,UncontrolledCopy,(c)BSIBS919-1:2007ii•©BSI2007Table8–TolerancesforNOTGOeffectivediametercheckplugsforwornGOringscrewgauges–solidtype9Table9–TolerancesforGOscrewcheckplugsforNOTGOeffectivediameterringgauges–solidtype10Table10–TolerancesforNOTGOscrewcheckplugsforNOTGOeffectivediameterringgauges–solidtype10Table11–TolerancesforGOandNOTGOplaincheckplugsfortheminordiametersofGOandNOTGOscrewringgauges–solidtype10Table12–TolerancesforadjustableGOscrewringandcallipergaugesforallclasses11Table13–TolerancesforadjustableNOTGOscrewringandcallipergaugesforallclasses12Table14–TolerancesfordoublelengthsettingplugsforadjustableGOscrewringgauges13Table15–TolerancesfordoublelengthsettingplugsforadjustableNOTGOscrewringgauges14Table16–TolerancesforsinglelengthsettingplugsforadjustableGOscrewcallipergauges15Table17–TolerancesforsinglelengthsettingplugsforadjustableNOTGOscrewcallipergauges15Table18–TolerancesforGOandNOTGOplaincalliper(GAP)gaugesformajordiameters16Table19–Constantsforuseincalculatinggaugedimensions(inch)17TableC.1–Effectivediameterequivalentsoferrorsinpitch35TableC.2–Effectivediameterequivalentsoferrorsinflankangles36TableD.1–Externalthreadswithspecifiedallowanceswhichhavetobemaintainedaftercoating–Unifiedthreads,Class1A38TableD.2–Externalscrewthreadswithspecifiedallowances(intheuncoatedcondition)whichcanbeabsorbedbythecoating–Unifiedthreads,Class2A38TableD.3–Externalscrewthreadswithnospecifiedallowance–Unifiedthreads,Class3A39TableD.4–Unifiedthreads,Classes1Band2B39TableD.5–Unifiedthreads,Class3B39TableD.6–SummaryofGOandNOTGOscrewgaugesandplaingaugesforcheckingunifiedthreads40SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesitoiv,pages1to45andabackcover.LicensedCopy:LondonSouthBankUniversity,LondonSouthBankUniversity,WedDec0514:56:55GMT+00:002007,UncontrolledCopy,(c)BSI©BSI2007•iiiBS919-1:2007ForewordPublishinginformationThisBritishStandardispublishedbyBSIandcameintoeffecton30November2007.ItwaspreparedbySubcommitteeSFTSE/1,Screwsandfastenerstechnicalspecificationcommittee,undertheauthorityofTechnicalCommitteeTDW/4,Technicalproductrealization.Alistoforganizationsrepresentedonthesecommitteescanbeobtainedonrequesttotheirsecretaries.BS919,Screwgaugelimitsandtolerancesisinfourparts:Part1:SpecificationforgaugesforscrewthreadsofunifiedformPart2:SpecificationforgaugesforscrewthreadsofWhitworthandB.A.formsPart3:SpecificationforgaugesforscrewthreadsofISOmetricformPart4:LimitsofsizeforgaugesforscrewthreadsofunifiedformdiametersinandlargerSupersessionThisPartofBS919supersedesBS919-1:1960,whichiswithdrawn.RelationshipwithotherpublicationsThisBritishStandardisinte