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ABCDEFGHIJKLMBoundary Dimensions and Identification NumberBoundary dimensionsNeedle Roller CageEw:Nominal roller set outside diameterFw:Nominal roller set bore diameterBc:Nominal cage widthBcFwEwFig. 9 Needle Roller CageThrust Roller BearingDc:Nominal cage outside diameterdc:Nominal cage bore diameterDw:Nominal roller diameterDwdcDcExamples of symbols for quantities indicating the boundary dimensions of IKO Needle Roller Bearings are shown below. For details, see the table of dimen-sions for each model.Machined Type Needle Roller Bearing:::: Nominal inner ring width Nominal bearing bore diameter Nominal bearing outside diameterd D B C Fw r rs min : Smallest permissible single chamfer dimensions of inner and outer rings Chamfer dimensions of inner and outer rings Nominal roller set bore diameter Nominal outer ring width::rrBCFwDdrrFig. 7 Machined Type Needle Roller BearingShell Type Needle Roller BearingD:Nominal bearing outside diameterFw:Nominal roller set bore diameterC:Nominal outer ring widthA26CFig. 10 Thrust Roller BearingFwDFig. 8 Shell Type Needle Roller Bearing
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