An outer spherical bearing with a seat is a bearing unit that combines a rolling bearing with a bearing seat. It is also known as a Bearing Unit or a joint-seat bearing. The characteristic of this bearing is that the outer diameter surface of its outer ring is spherical, which can be fitted into the corresponding concave spherical surface of the bearing seat to play a role in aligning. The design of the outer spherical bearing with a seat allows a certain amount of different centers caused by the deflection of the shaft, and has good aligning performance. In addition, this bearing also has a double-structure sealing device, which can work in harsh environments. The structural forms of the outer spherical bearing with a seat are diverse, and the versatility and interchangeability are good. Common housing types include vertical housing, narrow vertical housing, high center vertical housing, square housing, boss square housing, boss round housing, diamond housing, ring housing, slider housing, suspension housing, adjustable diamond housing, and suspension housing. These housing designs meet the needs of different application scenarios and provide flexible installation options.