Thrust ball bearings are divided into Single direction thrust ball bearings and Double direction thrust ball bearings. The Single direction thrust ball bearing consists of a shaft ring, a seat ring and a steel ball-cage assembly. Can bear unidirectional axial load, and can do unidirectional axial positioning, can not bear any radial load.

Double direction thrust ball bearing includes a shaft ring, two seat rings and two steel balls-cage assembly, which can bear two-way axial load and do two-way axial positioning, and cannot bear any radial load.

Thrust ball bearing