Single row angular contact ball bearings can only withstand axial load in one direction. When such bearings are subjected to pure radial load, they must be installed and used in pairs because the line of action of the rolling body load and the line of action of the radial load are not in the same radial plane, resulting in an internal axial component.

Single row angular contact ball bearings can only support axial loads in one direction. This type of bearing usually requires adjustment relative to another bearing. Its bearing ring has two shoulders, high and low, and cannot be separated.

Advantages of paired installation: If it is installed in pairs, the outer rings of a pair of bearings are opposite to each other, that is, the wide end faces the wide end face, and the narrow end faces the narrow end face. This avoids causing additional axial forces and confines the shaft or housing to the axial play in both directions. Because the raceways of the inner and outer rings can have relative displacement on the horizontal axis, angular contact ball bearings can bear radial load and axial load at the same time - combined load.

The double row angular contact ball bearing design is two single row angular contact ball bearings arranged back to back. This type of bearing has the same design as a single row angular contact ball bearing, but takes up less axial space. Bearings are non-separable.

Four-point contact ball bearings are separable bearings that can withstand bidirectional axial loads. It belongs to radial single row angular contact ball bearing. Compared to double row bearings, the axial space occupied is significantly reduced. The contact angle of SKF four-point contact ball bearings designed by QJ is 35° or 45°. The inner ring is a flat inner ring. This allows more balls to be installed in the bearing, which can give the bearing a higher load-carrying capacity. The rotation speed of the four-point contact ball bearing is very high and the operation is very stable, and its double half-ring can be removed from the whole set of bearings and installed separately, so the four-point contact ball bearing is mainly used in the engine.

The angular contact ball bearings can undertake both the radial load and axial load in the mean-time. Such bearings can work at a high rotational speed. The bigger the touching angle is, the greater the bearing's load capacity is.