... -7 4Noise level:Z1,Z2,Z3,Z4 High Performance low noise miniatrue stainless bearings1.Model:Open,Z,2Z,RS,2RS, ... DetailsBall bearings can be calssfied as “open”,”shielded”,”sealed”.(1) Single-row deep groove ball bearingsThey can sustain radial loads mainly ... be available for situations of high speed,high pricision ,low friction and low noise operations.(2) Shielded and sealed bearingsDeep groove ball ...