Ball Joint Rod End-Heim Joint Bearing SI80ES Ball Joint Bearing material: bearing steel,carbon steel, stainless steel low frictional and wear resistant with ball-stud of steel low coefficient of friction long operatin life Ball Joint Bearing Features: Function: Carrying capability, High temperature resistance and so on Applications: Engineering hydraulic cylinders, Construction and packing machinery, Auto shock absorber We offer ball joint bearings that are low frictional and are wear resistant.