>> P.143
DModel codeDimensionsSupplemental codeClassification symbolNA4905UUC2P6Example 2Model codeDimensionsBRI243716Type of bearingBearing bore diameter(24×1/16=11/2 inches)Bearing outside diameter(37×116=2516 inches)Outer ring width(16×116=1 inch)■Identification NumberThe identication number of Machined Type Needle Roller Bearings consists of a model code, dimen-sions, any supplemental codes and a classification symbol. Examples are shown below.Examples of identication numberExample 1Type of bearingDimension seriesBore diameter numberSeal symbol (With seals on both sides)Clearance symbol (C2 clearance)Accuracy class (Class 6)■AccuracyMachined Type Needle Roller Bearings are manufac-tured based on JIS (See page A31.). The tolerances for the smallest single roller set bore diameter of bear-ings without inner ring are based on Table 14 on page A33. For BR and BRI series, the accuracy is based on Table 2 and the tolerances for the smallest single roller set bore diameter are based on Table 3.Table 2 Accuracy of inner and outer rings of inch series BR and BRIIunit: μmd or D Nominal bearing bore dia. or outside dia. mm∆dmp∆Dmp∆Bs(∆Cs)Single plane mean Single plane mean Deviation of a single KiaRadial runout of KeaRadial runout of bore diameter outside diameter inner (or outer) ring assembled bearing assembled bearing deviationdeviationwidthinner ringouter ringD4HighLow Max. Max. 5-120253545-130 -130 -130 -130 -130 -130 101315202530000000Low- -13 -13 -15 -20 -25 High- 00000-10 -13 -13 -15-20 00000-HighLowOver- 19.05030.16250.80082.550Incl.19.050 30.16250.80082.550120.650 120.650 - Remarkd for ∆dmp, ∆Bs, ∆Cs and Kia, and D for ∆Dmp and Kea184.150
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