The angular contact thrust ball bearing mainly carries axial load, and it can also carry a certain radial load. Compared with thrust ball bearings of the same dimension, the limiting speed is also higher. It can make an axial location in one direction. Angular contact thrust ball bearings can make up for the weakness of the thrust ball bearings with flat back face which cannot carry radial loads. The contact angles are 45°and 60°. The smaller the degree of contact angle, the higher the capacity of the radial load is.