Designation:F2431−04(Reapproved2018)StandardSpecificationforRingBearing,Inner:ForNeedleRollerBearingwithThickOuterRing1ThisstandardisissuedunderthefixeddesignationF2431;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationcoversinnerringsforneedlerollerbearingshavingthickouterrings.1.2TheinnerringsbeingspecifiedareintendedforuseonunhardenedshaftsinconjunctionwiththeMS51961needlerollerbearingsspecifiedinSpecificationF2246.1.2.1Forneedlerollerbearingswiththinouterrings(Speci-ficationF2162,MS17131,MS52141)useinnerringsspecifiedinSpecificationF2163.1.3Innerringsdesignedtothisspecificationareintendedforuseinapplicationsrequiringhighradialloadwithminimalangularshaftmisalignment.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5ThisspecificationcontainsmanyoftherequirementsofMS51962,whichwasoriginallydevelopedbytheDepartmentofDefenseandmaintainedbytheDefenseSupplyCenterinRichmond.ThefollowinggovernmentactivitycodesmaybefoundintheDepartmentofDefense,StandardizationDirectorySD-1.2PreparingactivityCustodiansReviewActivityDLA–GS4Army–ATAirForce–84Navy–OSAirForce–-991.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3E18TestMethodsforRockwellHardnessofMetallicMa-terialsF2162SpecificationforBearing,Roller,Needle:DrawnOuterRing,FullComplement,WithoutInnerRing,OpenandClosed...
