... , mostly used for machine tool spindle bearing. FC, FCD, FCDP type four-row cylindrical roller bearings can bear greater radial load, more ... assemblies(k, k...zw, knl, kzk, kbk) Entity bushed needle roller bearing(RNA, NK, NA, NKI, NKS, NKIS, NA...RS, NA...RS ... and relative samples for quality evaluation and the marketing activities . Roller bearing