Based on its design, Donghua USA automotive chain can be classified into four groups: silent chain, roller chain, bush chain and Hy-Vo chain.   These chains are widely used in engine, transmission gear and power driving systems. Each of these chains use high quality alloy steel material and are specially heat treated to conform with ISO/TS 16949.   DONGHUA brand automotive chain is known around the world for its high level of  precision, high strength, high wear resistance, and high fatigue performance.