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DNominal bearing bore diameter d mmStandard typeWith seals on both sidesWith a seal on one sideNumber of oil holes of the inner ring00----00-11-000120d≦76.20076.200<dTable 6.2 Number of oil holes of the inner ringCaged Needle Roller BearingsBearing typeMetric seriesNATRI TAFIInch seriesBRIGuide Needle Roller BearingsMetric seriesGTRIRemarkThe type with an oil hole(s) is provided with an oil groove.■Matched Set Bearings■MountingWhen using two or more Machined Type Needle Mounting dimensions for Machined Type Needle Roller Bearings adjacent to each other on the same Roller Bearings are shown in the table of dimensions.shaft, it is necessary to obtain an even load distribu-tion. On request, a set of bearings is available, in which bearings are matched to obtain an even load distribution.■ Extended Life Specification Machined Type Needle Roller BearingsModel number : NA4904 Load : 10,500 N Lubrication :Cleaning oi ubriatdStandard eat-trated product Extended lf speciiation productsCumulative damage rate %Life hFig. 1 Life Test ResultRemark his table shows the result of life testing under load conditions at 50% of the basic dynamic rating.The Extended Life Specication with special heat treatment lasted 5 times longer or more in L10 life compared to the standard heat-treated products.D6Extended Life Specification Machined Type Needle Roller Bearings are treated with a newly developed special heat treatment that enhances the bearing's surface hardness and toughness, and suppresses the generation and growth of damage on the surface. Signicant life extension can be achieved under high load or under the condition of lubrication contaminated with foreign substances.In a life comparison test, as shown in Figure 1, IKO's special heat treated Extended Life Specification products lasted 5 times longer than standard heat-treated products.Extended Life Specification Machined Type Needle Roller Bearings, available according to the "Applicable Production Size" shown in Table 7, are made to order upon request.Table 7 Applicable Production SizeFwdWith inner ringd=10 〜 75mmWithout inner ringFw=14 ～ 85mmNA 4900 〜 4915NA 6901 〜 6915RNA 4900 〜 4915RNA 6901 〜 6915TAFI 102216 〜 7510535TAF 142216 〜 8510535TRI 153320 〜 7510845TR 203320 〜 8310845
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