Thrust ball bearings are designed to withstand thrust loads during high-speed operation, and are composed of a washer-shaped ferrule with a raceway groove for ball rolling. Since the ferrule is cushion-shaped, thrust ball bearings are divided into two types: flat base cushion type and adjustable thrust ball bearing hheey spherical seat cushion type. In addition, this kind of bearing can bear axial load, but cannot bear radial load.