The outer ring material is made of high-hardness steel (hardness HRC: 58 or above), quenched, phosphated, polished (special needs, hard chrome plating on the inner arc surface of the outer ring), polished, the inner ring base is a high-strength copper alloy, and the ball table is inlaid In the process of use, the high-mesh graphite and MoS2 composite solid lubricant makes the fine particles of the solid lubricant spread across the entire contact surface through frictional heat, forming a lubricating film similar to the oil film, but with a long lubricating effect compared to the oil film. The lubricating material is not lost, and the lubricating object is less worn.