Shield / closure: open ball bearing, Z, ZZ, RS, 2RS,2RZ
Ball bearings snap ring: N, NR msn:paipai1011 atlivedotcn
Tolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC-7
Vibration level codes: V4, V3, V2, V1
Internal clearance codes: C2, C3, C4, C5
Ball bearings material: AISI52100, AISI440C, AISI304, AISI316, ceramic
Retainer: PTFE, nylon, PEEK or stainless steel
Hardness for rings and balls: 59 - 63HRC
Ball bearings bore size: 1 - 200mm