thrust bearing is a specific kind of rotary bearing. Like other bearings, they allow rotation in between parts, however they are developed to support a predominantly axial load.
Thrust Roller Bearings are of 3 types:
Round Roller Thrust Bearings
These bearings consist of little cylindrical rollers set up flat with their axes indicating the axis of the bearing. They provide very good bring capacity and are cheap, but tend to wear due to the differences in radial speed and friction which is higher than with ball bearings.
Tapered Roller Thrust Bearings
These bearings consist of small tapered rollers organized so that their axes all assemble at a point on the axis of the bearing. The length of the roller and the size of the large and the narrow ends and the angle of rollers need to be carefully computed to supply the correct taper so that each end of the roller rolls efficiently on the bearing face without skidding.
Round Roller Thrust Bearings
Round Roller Thrust Bearing is a self-aligning bearing. In service, it permits an optimum shaft misalignment of about 2 degrees. The contact angle helps this type of bearing to handle a percentage of radial load.
Lubrication of these bearings needs to be done thoroughly given that their big sliding contact area leads to smearing. Care should be taken to maintain a minimum of rated minimum load on this bearing, to prevent smearing.

These bearings consist of small tapered rollers set up so that their axes all assemble at a point on the axis of the bearing. The length of the roller and the size of the wide and the narrow ends and the angle of rollers need to be thoroughly calculated to offer the appropriate taper so that each end of the roller rolls efficiently on the bearing face without skidding. Spherical Roller Thrust Bearing is a self-aligning bearing.