Outer spherical bearing with seat is a bearing unit that combines rolling bearing with bearing seat. Most of the outer spherical bearings are made of spherical outer diameter and installed together with the bearing seat with spherical inner hole. They have various structural forms, good universality and interchangeability.

At the same time, this kind of bearing also has certain self-aligning in design, is easy to install, and has a dual structure sealing device, which can work in a harsh environment. The bearing seat is generally cast. Common seats include vertical seat (P), square seat (f), boss square seat (FS), boss circular seat (FC), diamond seat (FL), ring seat (c), slider seat, etc.