Roller Bearings are rolling-element bearings that utilizes cylindrical rollers to sustain the division between moving parts of the bearing. They are designed to carry a load while minimising friction.

The impetus of a roller bearing is to lessen rotational friction and support radial and axial loads. They are versatile as they can consist of single or multiple rows of elements in which the latter can considerably improve radial load capacity.

This best allows for the many applications necessitated across a multitude of potential purposes in which ball bearings can be used. Some of the more commonly found types of ball bearings are axial, deep-groove, angular contact, and preloaded pairs.