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E3NAG4910UUP6NAS5010ZZNRExamplesofidenti(cid:16)cationnumberExample1Example2ModelcodeModelcodeDimensionsDimensionsSupplementalcodeSupplementalcodeClassificationsymbolTypeofbearingTypeofbearingShieldsymbol(Withshieldsonbothsides)Bearingringshapesymbol(Withstopringsonouterring)DimensionseriesDimensionseriesBorediameternumberBorediameternumberSealsymbol(Withsealsonbothsides)Accuracyclass(Class6)■TypesThetypesofRollerBearingsshowninTable1areavailable.TheidentificationnumberofRollerBearingsconsistsofamodelcode,dimensions,anysupplementalcodesandaclassificationsymbol.Thearrangementexamplesareshownbelow.■IdentificationNumberCagedRollerBearingsThesebearingsaresuitableforhigh-speedrotationsandfluctuatingloads.Also,astheaxialdistancebetweenthedouble-rowrollersiscomparativelylarge,largemomentloadscanbesupported.Cagedrollerbearingswithsealincorporatesealsonbothsides.Syntheticresinrubbersealsareexcellentinthepreventionofdustpenetrationandgreaseleak-age,providinganexcellentsealingeffect.FullComplementRollerBearingsThesebearingsaresuitableforlow-speedrotationsoroscillatingmotionsandheavyloads.Similartothecagedtype,thestructureisadvantageousforsupport-ingmomentloads.Thebearingswithsealincorporatesealsonbothsides.RollerBearingsforSheavesThesebearingsarethedouble-rowfullcomplementtypewithalowsectionalheightdesignedforuseinsheaves.Therearetwotypes;thesealedtypeandtheshieldtype.Theycanwithstandheavyradialloadsandshockloadsatcomparativelylow-speedrotations,andcanalsowithstandaxialloads.Theycaneasilybefixedaxiallytosheavesusingthestopringsoftheouterring.Asthewidthoftheinnerringisdesignedtobelargerthanthatoftheouterring,theyrequirenospacerbetweensheaves.Thestructureisstablebecausethedouble-rowrollerscanwithstandthemomentloadscausedbyropetransi-tion.Thesurfacesofthesebearingsaretreatedtohavehighcorrosionresistance.Table1TypeofbearingTypeSeriesStandardWithsealWithshieldNAU49TRUNAU49…UUTRU…UU──NAG49──NAS50…UUNRNAS50…ZZNRNAG49…UU──CagedtypeFullcomplementtypeForsheaves
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