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Table 3 olerances for smallest single roller setbore diameter Fws min of inch series BRunit: μmFw Nominal roller set bore diametermm∆Fws minDeviation of smallest single roller set bore diameter Over- 18.03430.22641.91050.03870.10480.010Incl. 18.03430.22641.91050.03870.10480.010102.108 High+43+46+48+51+53+58+61Low+20+23+25+25+28+28+31■ClearanceRadial internal clearances of Machined Type Needle Roller Bearings are made to the CN clearance shown in Table 18 on page A37. Radial internal clearances of BRI series are based on Table 4.Table 4 Radial internal clearance of inch series BRIunit: μmFwNominal roller set bore diametermmOver- 18.03425.90830.22635.05241.91050.03870.10480.010100.076 Incl. 18.03425.90830.22635.05241.91050.03870.10480.010100.076 102.108 Radial internal clearanceMin. Max.3341464850505656636866768286899299104 117 127 Table 6.1 Number of oil holes of the outer ring■FitThe recommended fits for Machined Type Needle Roller Bearings are shown in Tables 22 to 24 on pages A41 and A42.■LubricationBearings with prepacked grease are shown in Table 5. Lubrication grease (Shell Lubricants Japan K.K. Shell Gadus S2 V125J 2 (S)) is prepacked.In the case of bearings without prepacked grease, perform proper lubrication. Operating them without lubrication will increase the wear of the rolling contact surfaces and shorten their lives.Table 5 Bearings with prepacked grease〇:With prepacked grease×:Without prepacked greaseBearing typeStandard typeWith seals on both sidesWith a seal on one sideCaged Needle Roller BearingsMetric seriesRNA, NATR, TRI TAF, TAFI, TAF/SGInch seriesBR, BRI Guide eedle Rollr BearingsMetric seriesGTR, GTRI×××××〇--〇-×----■Oil HoleTable 6.1 shows the number of oil holes of the outer ring and Table 6.2 shows the number of oil holes of the inner ring.When mounting, avoid locating the oil hole within the loading zone. Doing so could shorten product life.When an outer ring with an oil hole is especially required for the type without an oil hole, add "-OH" before the clearance symbol in the identication num-ber. When an outer ring with an oil hole and an oil groove is required for the type without an oil hole, attach "-OG" before the clearance symbol. Example: TAFI 203216-OH C2 P6When an outer ring with multiple oil holes or an inner ring with an oil hole(s) is required, please consult IKO.Nominal roller set bore diameter Fw mmStandard typeWith seals on both sidesWith a seal on one sideNumber of oil holes of the outer ring1------1---11-1101121 Fw ≦ 26 26 < FwFw ≦ 69.85069.850 < FwCaged Needle Roller BearingsBearing typeMetric seriesRNA,NATR,TRI TAF,TAFIInch seriesBR,BRIGuide Needle Roller BearingsMetric seriesGTR,GTRIRemarkThe type with an oil hole(s) is provided with an oil groove.D5
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