There are two key points in assembling thrust ball bearings. One is the quality control of the cage and the ball, the other is the control of the nominal height T after assembling the bearing. In addition, because the axle ring and seat ring can be separated, there is a management problem that prevent imported bearing parts from being mixed. M-type stamping cage uses bending edge assembly die. After pressing, the steel ball is required to rotate flexibly in the pocket, but it can not fall off from the pocket, and the technical regulations check the movement of the steel ball in the pocket. If the solid cage is impressed too deeply, the movement of the ball will be small, and the connection between the protruding part of the imprint and the cage is too little and the strength is insufficient, so it is easy to drop the block and cause the cage to be scrapped. Small thrust ball bearing seat ring and the inner diameter of the bearing ring is very small difference, there is no obvious difference between the two groups. In order to prevent the occurrence of mixed sleeve phenomenon, a set of bearings that installed ceramic sleeve trapped are seat rings or are all shaft rings. Usually, the suction ring and the seat group are distinguished by means of auxiliary tooling, or the inner diameter is checked by the inner diameter plug gauge before the nominal height is checked. In order to check the inner diameter conveniently, the seat ring is lowered and the shaft ring is placed on the top. If the cabinet diameter has obvious quenching heating oxidation color or not grinding, it is not necessary to check the inner diameter size, which can clearly see the difference between the shaft and seat ring and be not easy to mix. After assembling the thrust ball bearing, it is necessary to measure the nominal height T and confirm that it is Lily lattice. When measuring, the bearing must be rotated dozens of times to reach the minimum height.