Self-aligning ball bearing is a double row bearing with spherical outer ring raceway. Inner ring, ball, cage can be free rotation around the center of the bearing, with self-aligning. The self-aligning ability compensates for misalignment, shaft deformation and bearing housing deformation. Self-aligning ball bearings for shaft and upper shell on the center of the difficulties, the shaft prone to flex the transmission bearings and other uses.

Self-aligning bearings are outer ring raceway processed into spherical shape, the inner ring has two deep groove raceway double row ball bearings, with self-aligning performance. It is mainly used to bear radial load, bear radial load, but also can withstand a small amount of axial load, but generally can not afford pure axial load, the limit speed is lower than deep groove ball bearings. This kind of bearing is used for double bearing shaft which is easy to bend under load and parts with double socket hole can not guarantee strict coaxiality, but the relative inclination of centerline of inner ring and outer ring shall not exceed 3 degree.