... 5. Z2V2, Z3V3,Z4V4 The purpose of a ball bearing is to reduce rotational friction and support radial and ... assembly (e.g., a hub or shaft). .Ball bearings tend to have lower load capacity for their ... devices, motorbikes, textile machines, autos and other areas. deep groove ball bearingWe have Open, Z, ZZ, RS, 2RS,RZ, ... 88316863FAX:0086-29-88327812WEBSITE: www.xmecbearings.com deep groove ball bearings