K Series Cage AssebliesOverview: Needle roller and cage assemblies feature ... . Controlled contour rollers optimize contact stress distribution.● Types: Metric sizes: K, KBK, KZK, RF, RFN, RS, R, RP, RV, V, ... C, WJ,WJC.designationsprincipal dimensionsd(mm)D(mm)B(mm)K 5X8X8588K 6X9X8698K 7X10X87108K 8X11X88118K 14X18X10141810K 15X19X10151910K 16X20X10162010K 17X21X10172110K 18X22X10182210K 20X24X10202410K ...