... product:radial needle roller and cage assemblies: K, K..ZW, K..D, K..ZWDneedle roller and cage assemblies for crank pin ... bearings: KZK,KBKlong cylindrical roller and cage assemblies: KNLand, ... and precision grade, please contact this company.Materials:Material for needle roller is GCr15 bearing steel, quench-hardening HRC60---65.Material ...