>> P.145
D6■MountingMountingdimensionsforMachinedTypeNeedleRollerBearingsareshowninthetableofdimensions.■MatchedSetBearingsWhenusingtwoormoreMachinedTypeNeedleRollerBearingsadjacenttoeachotheronthesameshaft,itisnecessarytoobtainanevenloaddistribu-tion.Onrequest,asetofbearingsisavailable,inwhichbearingsarematchedtoobtainanevenloaddistribution.Table6.2NumberofoilholesoftheinnerringBearingtypeMetricseriesInchseriesMetricseriesCagedNeedleRollerBearingsGuideNeedleRollerBearingsNATRITAFIGTRIWithasealononesideWithsealsonbothsidesStandardtypeNumberofoilholesoftheinnerring00----00-11-000120BRINominalbearingborediameter dmmd≦76.20076.200<dRemarkThetypewithanoilhole(s)isprovidedwithanoilgroove.■ExtendedLifeSpecificationMachinedTypeNeedleRollerBearingsWithinnerringWithoutinnerringd=10〜75mmFw=14～85mmNA4900〜4915RNA4900〜4915NA6901〜6915RNA6901〜6915TAFI102216〜7510535TAF142216〜8510535TRI153320〜7510845TR203320〜8310845dFwTable7ApplicableProductionSizeStandardeat-tratedproductExtendedlfspeciiationproductsModelnumber:NA4904Load:10,500NLubrication:CleaningoiubriatdCumulativedamagerate%LifehFig.1LifeTestResultRemarkhistableshowstheresultoflifetestingunderloadconditionsat50%ofthebasicdynamicrating.TheExtendedLifeSpecificationwithspecialheattreatmentlasted5timeslongerormoreinL10lifecomparedtothestandardheat-treatedproducts.ExtendedLifeSpecificationMachinedTypeNeedleRollerBearingsaretreatedwithanewlydevelopedspecialheattreatmentthatenhancesthebearing'ssurfacehardnessandtoughness,andsuppressesthegenerationandgrowthofdamageonthesurface.Significantlifeextensioncanbeachievedunderhighloadorundertheconditionoflubricationcontaminatedwithforeignsubstances.Inalifecomparisontest,asshowninFigure1,IKO'sspecialheattreatedExtendedLifeSpecificationproductslasted5timeslongerthanstandardheat-treatedproducts.ExtendedLifeSpecificationMachinedTypeNeedleRollerBearings,availableaccordingtothe"ApplicableProductionSize"showninTable7,aremadetoorderuponrequest.D
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