... structure.Features : Shield / closure: open ball bearing, Z, ZZ, RS, 2RS,2RZBall bearings snap ring: N, NRTolerance codes: ABEC-1 ... -7Vibration level codes: V4, V3, V2, V1Internal clearance codes: C2, C3, C4, C5Ball bearings material: AISI52100, AISI440C, AISI304, AISI316, ceramicRetainer: ... 200mmVersions: Ball bearings with one or two side rubber seal RS, 2RS.With one or two side metal shields Z and ...