90092750024242966AMERICANNATIONALSTANDARDSpecificationsforCarbideBlanksforTwistDrills,Reamers,EndMills,andRandomRodANSIB94.20-1977(REVISIONOF694.20-1968)SECRETARIATTHEAMERICANSOCIETYOFMECHANICALENGINEERSPUBLISHEDBYTHEAMERICANSOCIETYOFMECHANICALENGINEERSUnitedEngineeringCenterNewYork,N.Y.1O017345East47thStreetCopyrightASMEInternationalProvidedbyIHSunderlicensewithASMELicensee=UniversityofAlberta/5966844001,User=trert,rtyrtyrtyNotforResale,03/07/201523:49:19MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,````,``,`,,`,,`,`,```,`,,,,`-`-`,,`,,`,`,,`---=900927500242438T2Nopartofthisdocumentmaybereproducedinanyform,inanelectronicretrievalsystemorotherwise,withoutthepriorwrittenpermissionofthepublisher.CopyrightO1977byTHEAMERICANSOCIETYOFMECHANICALENGINEERSAllRightsReservedPrintedinU.S.A.CopyrightASMEInternationalProvidedbyIHSunderlicensewithASMELicensee=UniversityofAlberta/5966844001,User=trert,rtyrtyrtyNotforResale,03/07/201523:49:19MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,````,``,`,,`,,`,`,```,`,,,,`-`-`,,`,,`,`,,`---90072750024244739FOREWORDThematerialcontainedinthefollowingpagesofthisstandardwasoriginallydevelopedbytheStandardsCommitteeoftheCementedCarbideProducersAssociationincooperationwiththeSolidCarbideToolin-stituteandtheMetalCuttingToolInstitute.Thedimensionallistingstogetherwithtolerancesandnomenclatureweredevelopedafterathoroughin-vestigationofallfactorsinvolvedintheareacoveredbythisstandard.CertainportionsofthisstandardwerebasedonmaterialoriginallypreparedbytheSolidCarbideToolInstitute;othersweredevelopedafteracooperativeexchangeofideasbetweentheMetalCuttingToolInstituteandtheCementedCarbideProducersAssociation.OnMay19,1959,theCementedCarbideProducersAssociationsubmittedthefinaldraftofthestandardtoASA(nowAmericanNationalStandardsInstitute)forapprovalundertheExistingStandardsMethod.TheproposalwasapprovedasanAmericanStandardonMay24,1963,anddesignatedB85.1-1963.TheCementedCarbideProducersAssociationrequestedthatrevisionoft...
