1.Low noise and vibration 2.High accuracy and speed 3. ... , RS, 2RS,2RZBall bearings snap ring: N, NRTolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC-7Vibration level codes: V4, V3 ... steelHardness for rings and balls: 59 - 63HRCBall bearings bore size: 1 - 200mmVersions: Ball bearings with one or two side rubber seal ...