The self-aligning ball bearing is a spherical bearing mounted between the inner rings of two raceways and the outer rings of a spherical raceway. The center of curvature of the raceway surface is consistent with the center of the bearing, so it has the same self-aligning function as the self-aligning ball bearing. When the shaft and shell are deflected, it can be adjusted automatically without increasing the burden on the bearing. Spherical roller bearings can bear radial loads and axial loads in two directions. Self-aligning ball bearings have a large radial load capacity and are suitable for heavy loads and impact loads. The cage is made of steel stamping cage and polyamide. Self-aligning ball bearings are suitable for precision instruments, low-noise motors, automobiles, motorcycles, metallurgy, rolling mills,etc.