In the moving parts, the wear of the parts is caused by long-term friction. When the gap between the shaft and the hole is worn to a certain extent, the parts must be replaced. Therefore, the designer chooses the one with lower hardness and better wear resistance when designing. The material is bushing for locating pins, which can reduce the wear of the shaft and seat. When the bushing for locating pins is worn to a certain extent, it can be replaced, which can save the cost of replacing the shaft or seat.