K Series Cage AssebliesOverview: Needle roller and cage assemblies feature a ... contact stress distribution.● Types: Metric sizes: K, KBK, KZK, RF, RFN, RS, R, RP, RV, V, VS. Inch sizes: C, WJ,WJC ... .designationsprincipal dimensionsd(mm)D(mm)B(mm)K 5X8X8588K 6X9X8698K 7X10X87108K 8X11X88118K ...