... closure: Open ball bearing, Z, ZZ, RS, 2RS, 2RZ Ball bearings snap ring: N, NR Tolerance codes: ABEC-1, ABEC-3 ... V3, V2, V1 Internal clearance codes: C2, C0, C3, C4Ball bearings material: AISI52100Retainer: PTFE, nylon, or stainless steel Hardness for rings ... and balls: 59 - 63HRC Ball bearings bore size: 1 - 200mm Applications Typical applications: Electric motors, ...