A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. They reduce rotational friction and support radial and axial loads.

Mounted bearings and housings with rolling bearings support a rotating shaft, which can be bolted on a machine frame or any other substructure

Plain bearings, also referred to as bushes, bushings or sleeve bearings, are usually cylindrical in shape and contain no moving parts. They are used for sliding, rotating, oscillating or reciprocating motion.

A roller bearing is a type of rolling-element bearing that uses a cylinder (roller) instead of a ball. In general, the cylindrical bearings allow for greater radial loads.