Angular contact ball bearings can bear both radial and axial loads. Can work at higher speeds. The larger the contact angle, the higher the axial load capacity. High-precision and high-speed bearings usually have a contact angle of 15 degrees. Under the action of axial force, the contact angle will increase. Single row angular contact ball bearings can only bear axial load in one direction. When bearing radial load, additional axial force will be caused. And it can only limit the axial displacement of the shaft or housing in one direction. Angular contact ball bearings have a contact angle of 40 degrees and therefore can withstand large axial loads. Angular contact ball bearings are a non-separable design, with shoulders of different heights on both sides of the inner and outer rings. In order to increase the load capacity of the bearing, the shoulder on one side will be machined lower so that more steel balls can be loaded into the bearing. Double row angular contact ball bearings can withstand large radial loads, mainly radial and axial combined loads and moment loads, and limit the axial displacement of the shaft in both directions. The tiltability between the inner and outer rings of double-row angular contact ball bearings, which is mainly used to limit the bidirectional axial displacement of the shaft and housing, is limited. The allowable tilt angle depends on the internal clearance of the bearing, bearing size, internal design and the acting on it. The forces and moments on the bearings, and the maximum allowable inclination angle should ensure that excessive additional stresses are not generated in the bearings. If there is an inclination angle between the inner and outer rings of the bearing, it will affect the service life of the bearing, reduce the operating accuracy of the bearing, and increase the operating noise. Double row angular contact ball bearings generally use nylon cages or brass solid cages. When installing double row angular contact ball bearings, attention should be paid to the fact that although the bearings can withstand bidirectional axial loads, if there is a gap for ball installation on one side, care should be taken not to allow the main axial load to pass through the groove on the side with the gap. When using the bearing, care should be taken to ensure that the raceway on the side without the ball filling gap bears the main load.