Thrust ball bearings is a type of separate bearing,shaft ring, seat ring can separate from the cage and the component of the steel ball.The shaft ring is a ring that compatible with the axle,the seat ring is a ferrule that compatible with the bearing saddle bore,have a gap with the axle.The structure of import thrust ball bearings have a lot of variants.

Single direction thrust ball bearings,are composed of washer-shaped rings with a ball raceway and cages that composition of the ball.The ring that installed in the axis is called the axis ring,the ferrule that installed in the ring is called the seat ring,two-way bearings are used with the centre circle installed in the shaft.

Two-way thrust ball bearings can withstand axial load from two directioons,    however the one-way thrust ball bearings can only afford the axial load from one direction.