BS 3643-1-1981 ISO 米制螺纹第一部分：原则与基本数据

BRITISHSTANDARDBS3643-1:1981(Reprinted,incorporatingAmendmentsNo.1andNo.2)SpecificationforISOmetricscrewthreads—Part1:PrinciplesandbasicdataUDC621.882.082.1Licensedcopy:PONTYPRIDDCOLLEGE,26/10/2006,UncontrolledCopy,©BSIBS3643-1:1981ThisBritishStandard,havingbeenpreparedunderthedirectionoftheMechanicalEngineeringStandardsCommittee,waspublishedundertheauthorityoftheExecutiveBoardandcomesintoeffecton31March1981©BSI02-1999FirstpublishedJune1963FirstrevisionMarch1981ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceMEE/1Draftforcomment78/80250DCISBN0580116263CooperatingorganizationsTheMechanicalEngineeringStandardsCommittee,underwhosedirectionthisBritishStandardwasprepared,consistsofrepresentativesfromthefollowing:Theorganizationsmarkedwithanasteriskintheabovelist,togetherwiththefollowing,weredirectlyrepresentedontheTechnicalCommitteeentrustedwiththepreparationofthisBritishStandard:AssociatedOfficesTechnicalCommitteeDepartmentofTrade(MarineDivision)AssociationofConsultingEngineersDepartmentofTransportAssociationofHydraulicEquipmentElectricitySupplyIndustryinEnglandandManufacturersWalesAssociationofMiningElectricalandEngineeringEquipmentUsers’AssociationMechanicalEngineersFederationofManufacturersofConstructionBritishCompressedAirSocietyEquipmentandCranesBritishElectricalandAlliedManufacturers’HealthandSafetyExecutiveAssociation(BEAMA)*InstitutionofGasEngineersBritishGasCorporationInstitutionofMechanicalEngineersBritishGearManufacturers’AssociationInstitutionofPlantEngineersBritishInternalCombustionEngineInstitutionofProductionEngineersManufacturers’Association*LLoyd’sRegisterofShippingBritishPumpManufacturers’AssociationLondonTransportExecutiveBritishSteelCorporationMachineToolIndustryResearchAssociationBritishSteelIndustryMinistryofDefence*BritishValveManufacturers’AssociationLtd.NationalCoalBoard*CbmpeOilCompaniesMaterialsAssociationCharteredInstitutionofBuildingServicesProcessPlantAssociationCrownAgentsforOverseaGovernmentsandRailwayIndustryAssociationofGreatBritain*AdministrationsSocietyofMotorManufacturersandTradersDepartmentoftheEnvironment(PSA)LimitedDepartmentofIndustry(MechanicalTelecommunicationEngineeringandEngineering)ManufacturingAssociation(TEMA)*DepartmentofIndustry(NationalEngineeringLaboratory)*AgriculturalEngineers’AssociationGaugeandToolMakers’AssociationBicycleAssociationofGreatBritainScrewThreadToolManufacturers’BritishIndustrialFastenersFederationAssociationBritishRailwaysBoardSocietyofBritishAerospaceCompaniesBusinessEquipmentTradeAssociationLimitedFastenersandTurnedPartsInstituteIndividualmanufacturerAmendmentsissuedsincepublicationAmd.No.DateofissueComments3910May19824701December1984IndicatedbyasidelineinthemarginLicensedcopy:PONTYPRIDDCOLLEGE,26/10/2006,UncontrolledCopy,©BSIBS3643-1:1981©BSI02-1999iContentsPageCooperatingorganizationsInsidefrontcoverForewordii1Scope12References13Basicprofile14Generalplan25Basicdimensions66Tolerances:principlesandbasicdata147Tolerances:deviationsforconstructionalthreads29AppendixANotesforguidance47AppendixBOutlineguideandexamplesforcalculatinglimitsofsizeofuntabulatedmetricscrewthreads49Figure1—BasicprofileofISOmetricthread1Figure2—Basicdimensions6Figure3—Tolerancepositionswithrespecttozeroline(basicsize)15Figure4—NutthreadswithtolerancepositionG17Figure5—NutthreadswithtolerancepositionH17Figure6—Boltthreadswithtolerancepositionse,fandg18Figure7—Boltthreadswithtolerancepositionh18Figure8—Boltrootprofile26Figure9—Maximummaterialprofilesforinternalandexternalthreads47Table1—Basicprofiledimensions2Table2—Maximumdiameters3Table3—Diameter/pitchcombinations4Table4—Basicdimensions7Table5—Fundamentaldeviationsfornutthreadsandboltthreads19Table6—Lengthsofthreadengagement20Table7—Minordiametertolerancesofnutthread()21Table8—Majordiametertoleranceofboltthread(Td)22Table9—Pitchdiametertoleranceofnutthread()23Table10—Pitchdiametertoleranceofboltthread()24Table11—Minimumrootradii25Table12—Toleranceclassesfornuts26Table13—Toleranceclassesforbolts28Table14—Deviations30PublicationsreferredtoInsidebackcoverTD1TD2Td2Licensedcopy:PONTYPRIDDCOLLEGE,26/10/2006,UncontrolledCopy,©BSIBS3643-1:1981ii©BSI02-1999ForewordThisrevisedBritishStandardhasbeenpreparedunderthedirectionoftheMechanicalEngineeringStandardsCommittee.ItisbasedonthefollowingISOstandardsrelatingtoISOmetricscrewthreadspreparedbyTechnicalCommitteeISO/TC1,Screwthreads,oftheInternationalOrganizationforStandardization(ISO).TheclausesinthisstandardhavebeensoarrangedthateachrelatesdirectlytotherelevantISOstandardasindicated:Clause3:ISO68-1963Clause4:ISO261-1973Clause5:ISO724-1968Clause6:ISO965/1-1980Clause7:ISO965/3-1980ISO965/2-1973“ISOgeneralpurposemetricscrewthreads—Tolerances—PartIILimitsofsizesforcommercialboltandnutthreads—Mediumquality”,hasnotbeenincludedasaseparateclauseinthisstandardasthelimitsofsizeslistedarespecifiedinBS3643-2.ISO965hasbeenrevisedbyISO/TC1toincludethetoleranceposition“f”andthemodifiedboltrootprofile.Thisinformationhasbeenincludedinthisstandard.Screwthreadtermsanddefinit