... : open ball bearing, Z, ZZ, RS, 2RS,2RZBall bearings snap ring: N, NRTolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC ... ZZ (2Z)With a snap ring groove in outer ring NWith a snap ring groove in outer ring and external snap ring NRIn different radial clearances C5 ... rubber seals/steel shields type(Inch series)With snap ring/snap ring grooveFlange ball bearings(Metric series)Flange ball bearings(Inch series ...