BS-1726-1-2002

BRITISHSTANDARDBS1726-1:2002Cylindricalhelicalspringsmadefromroundwireandbar—Guidetomethodsofspecifying,tolerancesandtesting—Part1:CompressionspringsICS21.160

 
 LicensedCopy:sheffieldunsheffieldun,na,FriNov2406:09:17GMT+00:002006,UncontrolledCopy,(c)BSIBS1726-1:2002ThisBritishStandard,havingbeenpreparedunderthedirectionoftheEngineeringSectorPolicyandStrategyCommittee,waspublishedundertheauthorityoftheSectorPolicyandStrategyCommitteeon25September2002©BSI25September2002ThefollowingBSIreferencesrelatetotheworkonthisBritishStandard:CommitteereferenceGME/15Draftforcomment02/702408DCISBN0580397394CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedtoTechnicalCommitteeGME/15,Mechanicalsprings,uponwhichthefollowingbodieswererepresented:BritishImpactTreatmentAssociationInstituteofSpringTechnologyAmendmentsissuedsincepublicationAmd.No.DateCommentsLicensedCopy:sheffieldunsheffieldun,na,FriNov2406:09:17GMT+00:002006,UncontrolledCopy,(c)BSIBS1726-1:2002©BSI25September2002iContentsPageCommitteesresponsibleInsidefrontcoverForewordii1Scope12Normativereferences13Terms,definitionsandsymbols14Specifyingspringsforgeneralpurposes85Tolerances166Methodsofverification19Figure1—Datasheet110Figure2—Handofcoiling11Figure3—Endcoilform11Figure4—Coilendformedfromtaperedbar11Figure5—Datasheet215Figure6—Measurementoffreelengthandparallelism20Figure7—Measurementofsquareness21Figure8—Measurementofbow21Table1—CalculatedtolerancesforgroupAspringsmadefromcircularsectionmaterial,withmorethan3.5andlessthan5totalcoils18Table2—CalculatedtolerancesforgroupBspringsmadefromcircularsectionmaterial,withmorethan3.5andlessthan5totalcoils19LicensedCopy:sheffieldunsheffieldun,na,FriNov2406:09:17GMT+00:002006,UncontrolledCopy,(c)BSIBS1726-1:2002ii©BSI25September2002ForewordBS1726-1wasfirstpublishedin1951andrevisedin1964toincorporatemuchoftheessentialinformationfromADEDesignDataSheets,whichwerenolongeravailablefromHMStationeryOfficeandforwhichcopyrightpermissiontorepublishwasobtained.Thestandardwasrevisedin1987totakeaccountofcurrentmanufacturingprocesses.BSEN13906-1waspublishedin2002andundertherulesofCENtheUKisobligedtowithdrawconflictingstandards.ThiseditionofBS1726-1includesthoseprovisionsofthepreviouseditionnotincludedintheENstandard.TogetherwithBS8726-1:2002andBSEN13906-1:2002,thiseditionofBS1726-1supersedesBS1726-1:1987,whichiswithdrawn.BS1726ispublishedinthreeparts:—Part1:Compressionsprings;—Part2:Extensionsprings;—Part3:Torsionsprings.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesiandii,pages1to23andabackcover.TheBSIcopyrightnoticedisplayedinthisdocumentindicateswhenthedocumentwaslastissued.LicensedCopy:sheffieldunsheffieldun,na,FriNov2406:09:17GMT+00:002006,UncontrolledCopy,(c)BSIBS1726-1:2002©BSI25September200211ScopeThisPartofBS1726providesguidanceonmethodsofspecifying,tolerancingandtestingofparallelsidedhelicalcompressionspringsmanufacturedfromcircularsectionmaterial.Twogradesoftolerance,1and2,aregivenforcircularsectionsprings.Threetypesofendcoilsareprovidedfor,i.e.openend,closedend,andclosedandgroundend,thelastofthesebeingapplicableonlytospringswherethediameteroraxialdimensionofmaterialis0.5mmorgreater.ThisPartofBS1726differentiatesbetweenspringsthathaveorhavenotbeenstressrelievedafterforming(designatedgroupA),andsprings,thematerialofwhichhasundergoneastructuralchangebyheattreatmentafterforming(designatedgroupB).Thisstandardgivestwomethodsofspecifyingspringsforgeneralpurposesandonemethodoftestingsprings.2NormativereferencesThefollowingreferenceddocumentsareindispensablefortheapplicationofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocumentapplies.BS817,Specificationforsurfaceplates.BS887,Specificationforprecisionverniercallipers.BS939,Specificationforengineers’squares(includingcylindricalandblocksquares).BS957-2,Specificationforfeelergauges—Metricunits.BS969,Specificationforlimitsandtolerancesonplainlimitgauges.BSENISO7500-1,Tension/compressiontestingmachines—Verificationandcalibrationoftheforcemeasuringsystem.BSENISO3650,Geometricalproductspecifications(GPS)—Lengthstandards—Gaugeblocks.BS5204,Specificationforstraightedges.BS5317,Specificationformetriclengthbarsandtheiraccessories.BS5411,Methodsoftestformetallicandrelatedcoatings.BS6365,Specificationforprecisionvernierdepthgauges.BS6468,Specificationfordepthmicrometers.BSEN13906-1,Cylindricalhelicalspringsmadefromroundwireandbar—Calculationanddesign—Part1:Compressionsprings.3Terms,definitionsandsymbols3.1TermsanddefinitionsForthepurposesofthisPartofBS1726followingtermsanddefinitionsapply.3.1.1activecoilseffectivecoils(non-preferred)workingcoils(non-preferred)coilsofaspringthatatanyinstantarecont