The common contact angles of angular contact bearings are 15°, 25° and 40°, and the corresponding suffix codes are C, AC and B. Among them, the bearinng with the 15° angle mainly bears radial force and a small part of the axial force, which is suitable for high speed and high precision occasions; the bearinng with the 25° angle is subjected to a slightly larger axial force than the 15° angle; the bearinng with the 40° angle are subjected to greater axial forces and are suitable for large axial loads and vertical installation of equipment.

Single-row angular contact ball bearings are typically used in two or more bearings in the arrangement, and there are three different arrangements in the duplex bearing, namely DT (Tandem Duplex Bearing), DB (Back-To-Back Duplex Bearing), and DF (Face-To-Face Duplex Bearing). Compared with different arrangements, the rigidity and the performance of the overturning moment of the DB are better, while the rigidity and the performance of the DF are not as good as the DB.

Bearings in the arrangement can bear combined radial and axial loads dominated by radial loads, or only radial loads. The tandem arrangement can only bear axial loads from single direction, while the back-to-back arrangement and face-to-face arrangement can bear axial loads from either direction. According to a certain preload and clearance requirement, the manufacturer produces bearings in the arrangement that meet the requirements for the users, and after the user installs and fastens, the rings and the steel ball are in a preloaded state, which improves the rigidity of the combined bearing. It should be noted that the characteristics of bearings in the arrangement are generally adjusted before leaving the factory, so it is important to avoid mixing different arrangement of bearings when using them.