The outer spherical ball bearing is actually a variant of the deep groove ball bearing, which is characterized by the spherical outer diameter surface of its outer ring, which can be fitted into the corresponding concave spherical surface of the bearing seat to play the role of self-aligning. Outer spherical bearing is mainly used to bear radial and axial combined load which is mainly radial load. Generally, it is not suitable to bear axial load alone.This kind of bearing also has a certain degree of self-aligning in design, easy to install, and has a double structure sealing device, which can work in harsh environment. The bearing block is generally cast. The common seats are vertical seat (P), square seat (f), boss square seat (FS), boss round seat (FC), diamond seat (FL), ring seat (c), slider seat (T).