Roller bearings are bearings with cylindrical rolling elements (rollers) placed between inner and outer rings (called races). They are used in a variety of applications such as general machinery, machine tools, motors and reduction drives.

Roller bearings extend the working life of wheels, pulleys, fans, pumps, compressors, and other rotating parts by reducing friction and enabling parts to move smoothly. They have a wide, flat bearing to provide stability in high-speed applications with high radial loads. Radial loads exert force across the diameter (radius) of the shaft, such as those exerted by the load supported by a pulley or wheel.Roller bearings are any cylindrical or spherical object that aids in the movement of an object greater in size than the bearing itself. A roller bearing is a weight distribution-oriented bearing. This means it utilizes many points of contact between a circular housing that contains internal rolling elements, such as ball bearings, that sit within a collar.