... 7 4Noise level:Z1,Z2,Z3,Z4 Stainless steel miniature deep groove ball bearings1.Model:Open,Z,2Z,RS,2RS, ... V2,V3,V4Hardness of the bearing:HRC59-6ApplicationAutomotive,Office equipment,Electric applicance,Electronics equipment,Optical instrument,etc. DetailsBall bearings can ... be calssfied as “open”,”shielded”,”sealed”.(1) Single-row deep groove ball bearingsThey can sustain radial loads mainly and can ...