A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the moving parts of the bearings – the inner and outer part of the bearings. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.

Ball bearings are of simple design, durable in operation and easy to maintain. They are available in single and double row designs and in open and sealed variants. Due to their low frictional torque, they are suitable for high speeds.