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The Bushing Chain ( Bushing With Oil Hole) is composed of four major parts: inner chain plate, outer chain plate, pin shaft, and sleeve. Qingdao Zhenghe uses imported raw materials and processing equipment, uses chrome infiltration and isothermal treatment processes, and obtains products with high fatigue and wear resistance through precise chain assembly and automatic strengthening pre tensioning. The sleeve with oil holes has a cooling and lubricating effect on the chain, which is suitable for operating in more harsh environments and can improve the service life of the chain. Qingdao Zhenghe has sleeve oil hole drilling technology and directional assembly technology, and corresponding national patents.