AMERICANNATIONALSTANDARDGeneralTolerancesforMetricDimensionedProductsANSIB4.3-1978REAFFIRMED1999FORCURRENTCOMMITTEEPERSONNELPLEASESEEASMEMANUALAS-11SECRETARIATTHEAMERICANSOCIETYOFMECHANICALENGINEERSPUBLISHEDBYTHEAMERICANSOCIETYOFMECHANICALENGINEERSUnitedEngineeringCenter345East47thStreetNewYork,N.Y.10017REAFFIRMED2004FORCURRENTCOMMITTEEPERSONNELPLEASEE-MAILCS@asme.orgNopartofthisdocumentmaybereproducedinanyform,inanelectronicretrievalsystemorotherwise,withoutthepriorwrittenpermissionofthepublisher.Copyright01978byTHEAMERICANSOCIETYOFMECHANICALENGINEERSAllRightsReservedPrintedinU.S.A.标准分享网www.bzfxw.com免费下载www.bzfxw.comFOREWORDTheAmericanNationalStandardsCommitteeB4wasreorganizedinNovember1975andrenamed“StandardizationofAllowancesandTolerancesforManufacturedParts”.Aneedforageneraltolerancingsystemsimilarto,andrecommendedtobeusedwith,theANSIB4.2standardonPreferredMetricLimitsandFitswasrecognized.TheInternationalStandardIS02768,PermissibleMachiningVariationsinDimen-sionsWithoutToleranceIndications,waspreparedbytheTechnicalCommitteeISO/TC3-LimitsandFits,fortheabovepurpose,anditwasapprovedbytheU.S.A.and22othercountriesin1972.ItwasdecidedbytheB4CommitteethatasimilarAmericanstandardbepreparedbasedontheIS02768standard.AdraftproposalwascirculatedforletterballotoftheCommitteeonOctober14,1976.CommentsreceivedasaresultofthisballotledtochangesoftheoriginaldraftproposalandsubsequentapprovalofthetextbytheB4StandardsCommittee.FinalapprovalforthisstandardwasgrantedbytheAmericanNationalStandardsInstituteon16March1978.iiiwww.bzfxw.comAMERICANNATIONALSTANDARDSCOMMITTEEB4StandardizationofAllowancesandTolerancesforManufacturedParts(ThefollowingistherosteroftheCommitteeatthetimeofapprovalofthisStandard)OFFICERSKnut0.Kverneland,ChairmanC.J.Gomez,SecretaryCOMMITTEEPERSONNELAMERICANMEASURINGTOOLMANUFACTURERSASSOCIATIONR.P.Knittel,GlastonburyGage,REBIndustries,Inc.,Glastonbury,ConnecticutAMERlCANSOCIETYOFMECHANICALENGINEERS,THEA.E.Merritr,HarnischfegerCorporation,Milwaukee,Wiscon...
