Thrust ball bearing is made up of housing ring, axis ring and steel ball maintains module. Which is match for axis is called axis ring, which is match for shell is called housing ring. According to the condition of accepting force, there are one-way thrust ball bearing and double-way thrust ball bearing. One-way thrust ball bearing can endure one-way axial load, and double-way thrust ball bearing can be subject to bi-directional load. Thrust ball bearing can not stand the radial load, the extreme rotation speed is very low.