... 6900series 2,ABEC-1,3,5,Z2V2,Z3V3,Z4V4 3,For Fan,Motor,Tools,Machinery, 4,ISO9001 5,C0 C2 SKF ... ball bearing 1.Open,Z,RS,RZ 2.Little friction torque,suitable for the high speed,low noise,low virbrationSKF Deep groove ... as well as moderate axial load. With less coefficient of friction, less vibration and noise,less energy consumption, high limiting speed ...