A thrust bearing is a particular type of rotary bearing.

Like other bearings they permit rotation between parts, but they are designed to support a predominantly axial load. 

Thrust bearings come in several varieties.

Thrust bearings have specially designed raceways and asymmetrical rollers.

The bearings can accommodate axial loads acting in one direction and simultaneously acting radial loads.

The load is transmitted between the raceways via the rollers at an angle to the bearing axis, while the flange guides the rollers.