We can find the following 3 types machinery accessories and parts in the existing design manual of mechanical parts:
1.Mainly used for precision machinery, and has a high requirements on the stability, the parts wear limit does not exceed 10% of the tolerance value in use process or after repeated assembly, which is mainly applied in precision instrument, precision measuring surface, very important parts friction surface, such as the cylinder inner surface, precision machine tool spindle neck.
2.Mainly used in ordinary precision machinery, also has a high requirements on the stability, the parts wear limit does not exceed 25% of the tolerance value, and must have good sealing contact surface, which is mainly used in machine tools, tools, also surface and taper pin-hole that work with rolling bearing.
3.Mainly used in general machinery, it requires he parts wear limit does not exceed 50% of the tolerance value, and been applied to the sleeve,key and key-way working surface that don’t have relative motion, or the work-surface of reducer that has slow relative motion speed.

Zhangjiagang YaoYu Wear Resistant Materials Company is a joint venture company that produce wear resistant steel plate and pipe of VAUTID Brand, also provide wear protection for different machinery parts.