There are two key points of thrust ball bearing assembly. One is the control of the pressing quality between the cage and the ball, and the other is the control of the nominal height T of the bearing after assembly. In addition, the shaft ring and seat ring can be separated, which brings a management problem. Is to prevent the mixed loading of imported bearing parts. The M - type stamping cage uses a curved edge assembly die. After pressing, the steel ball is required to rotate flexibly in the pocket hole, but it can not fall off from the pocket hole, and the technical regulations to check the ball in the pocket hole of the flow momentum. The solid cage stamping too deep will make the ball flow momentum is small, and the connection between the embossed part and the cage is too little and the strength is insufficient, easy to appear block phenomenon, resulting in the cage scrap. The inner diameter of the small thrust ball bearing seat ring and the shaft ring is very small, and there is no obvious difference between the two groups. In order to prevent the occurrence of mixed sleeve phenomenon, that is, a set of bearings installed into two are found to be seat ring or shaft ring. This requires certain measures to be taken. Usually when closing the sleeve with the help of auxiliary tooling will draw ring, seat group to be distinguished, or in the random inspection of nominal height before the inner diameter plug gauge to check the size of the inner diameter, in order to check the inner diameter is convenient, the seat ring put below, the shaft ring put above. If the inner diameter of the seat ring has obvious quenching heating oxidation color or without grinding, there is no need to check the inner diameter size, can clearly see the difference between the shaft ring and the seat ring, not easy to mix. After the assembly of thrust ball bearing, the nominal height T should be measured to confirm whether it is qualified. When measuring, calibrate with height block or standard parts, and measure the load. The bearing needs to rotate for dozens of times, and be sure to reach the minimum height