... inner ring:1,ABEC-3,5;Z2V2,Z3V3 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1,Z2 5 ... ,C2,C0,C3... needle bearing inner ring,Lily bearing is ... assemblies, rod use KZK, KBK Needle roller bearings without inner ring, NK, RNA, NKS Needle roller bearings, NKI, ... NA Needle roller bearings, flanges, without inner ring, RNAO, RNAO, ZW Needle roller bearings, flanges, ...