... excellent quality SKF NSK NTN FAG TIMKEN Brand Bearing1. Seal form: open style, Z, ZZ, RS, 2RS, ... most popular of all the ball bearing types because they are available in a wide variety of ... high-speed operation. Consequently, they are available in many executions and sizes.Deep groove ball bearing ... non-separable and require little attention or maintenance in service, capable of operating at high speeds ...