The Silent Chain is composed of three major parts: guide plate, chain plate, and pin shaft. Qingdao Zhenghe uses imported raw materials and processing equipment, uses chrome vanadium infiltration and isothermal treatment processes, and obtains products with high fatigue and wear resistance through precise chain assembly and automatic strengthening pre tensioning. The product adopts self-developed smooth punching technology, which makes the hole bright strip reach more than 90% and improves the durability life of the chain by more than 50%.