The outer spherical bearing with a seat consists of an outer spherical ball bearing with sealing on both sides and a cast (or steel plate stamped) bearing seat. The internal structure of the bearing with outer spherical surface and seat is the same as that of the deep groove ball bearing, but the outer ring of this bearing has a truncated outer surface, which can automatically adjust the center when matched with the concave spherical surface of the bearing seat. Generally, this bearing uses jackscrews, eccentric sleeves or locking sleeves to fix the inner ring of the bearing on the shaft, and rotates with the shaft. The bearing with seat has a compact structure and is easy to assemble and disassemble. It is suitable for simple support, and is often used in mining, metallurgy, agriculture, chemical industry, transportation and other machinery.

There are two types of bearings with a top thread: the UC type with a wide inner ring and the UB type with a flat head at one end of the inner ring. They are suitable for situations where the direction of rotation changes. There are two types of bearings with an eccentric sleeve: the UEL type with a wide inner ring and the UE type with a flat head at one end of the inner ring. They are suitable for situations where the direction of rotation remains unchanged. The UK+H type with a wide inner ring and a tapered inner diameter is suitable for situations where the direction of rotation changes, the speed is higher, and the operation is smoother than those with top thread and eccentric sleeve bearings. There are many types of outer spherical ball bearing seats, There are various forms of vertical, square, diamond, convex circular, circular, and slider seats with casting seats, while the vertical, circular, triangular, diamond and other forms of stamped seats can be divided into various structural forms of bearings with seats based on the structural deformation of the seats or the lubrication and sealing methods of the bearings (see the classification of spherical ball bearings with seats for details), suitable for different needs.

Outer spherical ball bearings with seats are usually used in harsh working environments such as soil, dust, humidity, and high temperatures. The lubricating grease inside the bearings will deteriorate in a short period of time. Therefore, it is necessary to regrease the outer spherical ball bearings with seats at appropriate time intervals, replacing the deteriorated grease with fresh grease. IB cast iron outer spherical ball bearings are equipped with oil nozzles that can be re lubricated, ensuring perfect performance and long service life in any working environment.