The inner ring groove of this type of bearing is slightly shallower than that of the deep groove ball bearing. The inner diameter of the outer ring on the side without a rib is cylindrical from the bottom of the outer ring groove, and the outer ring can be separated, facilitating the installation of the bearing. Usually, two bearings are used in opposition. This type of bearing is a small-sized bearing with an inner diameter ranging from 4 to 20 mm. It is mainly used in small generators, gyroscopes, measuring instruments, etc. Generally, a copper alloy stamping cage is adopted.