Hangzhou Donghua Chain Group Co.,Ltd. ( original Hangzhou Donghua Chain general company), was founded in November, 1991. With its five wholly owned subsidiaries, including Hangzhou Ziqiang Chain Drive Co., Ltd and Jiangsu Xinghua Gear Factory being a wholly owned company under Donghua in 2007, it is a professional manufacturer of chains, sprockets, tooth gears and various power transmission products, and it is one of the top 500 domestic private enterprises and the chain drive branch general of China Mechanical General Components Industry Association. The group has DONGHUA, ZIQIANG, and DUNPAI three brands with DONGHUA has been recognized as China well known brand in 2008, ZIQIANG chain was awarded with "famous product of Zhejiang Province" and "famous brand of Zhejiang Province". The group is focused on producing all variety of standard roller chains and special chains, such as conveyor chain, stainless steel chain, agricultural chain and has not just sold its products all over china, but also sold more than 65% products to oversees, including Europe, America, South-east Asia, and it also has set up storage logistics in places like Europe. With Donghua brand registered in more than 70 countries like America , Europe , Japan and so on, it has partners among world top enterprises, such as JOHNDEERE, NEW HOLLAND, CLAAS, HONDA, KUBOTA, YANMAR, etc. There is a technical center of province level, Donghua academician working station, experiment station for Donghua post doctors, and national 863 program set up in Donghua group. With these platforms and strong technical ability, the more than 400 technicians have developed all variety of special high precise and high strength products, conducted mold programs for key components in the car and national industry revitalizing program, resulting more than 5000 developed over, among which 33 items are autonomous patent technology with 4 patent approved .The new products include a series of high-tech and high quality chains, such as chains for agricultural machineries, metallurgical chains, escalator step-chains, high-speed tooth chains, timing chains, self-lubrication chains, among which have type high speed tooth chain for car branch dynamic box and aerial chains fill in the blanks of chain in China. The group has taken part in the making and revising of ISO/TC100 international chain standard several years in success and hosted the 16th ISO/TC100 International annual meeting in 2004. It has established stable cooperation with many well known universities and institutes in china such as, Zhejiang University, Jilin University, Technical committee of national chain drive standard, Institute of national chain drive, Zhejiang application engineering material institute, Huhan material protection institute; and it cooperated to found China First Car chain institute with National chain drive institute. The high precise CNC equipment, such as Slow-feeding wire-cut machine, jig grinding machine and electric discharge machine, ensures the top quality precision of mould processing, with the high efficient and environmental protection acid rolling line being the largest raw material converting equipment in the field in china; The wildly use of automatic milling machine, high-speed automatic feeding punch, high speed automatic rolling and assembling machine guarantees the high quality and efficiency of components and chain making. Advanced thermo treatment equipment, such as network heat treatment oven, multi-use thermo treatment oven, etc. ensures the stability and consistency of the key function of components. Donghua has set up a complete set of quality management system which is provided with advanced inspection and test equipment. Donghua has been successfully certified by ISO9002 Quality Management System, ISO9001 Quality Management System, API certificate, ISO/TS16949:2002 and ISO10012 measurement management system. In 2008, it was awarded with "National Export Commodity Inspection-free Enterprise". Full use has been made of all kinds of advanced techniques and technology to reach excelsior manufacturing. Every process, every section, every function in Donghua is demanded to be done one step following another, carefully and cautiously, from material selection, reformation to manufacturing accessories, from components heat treatment to automatic assembly, from quality control to product inspection and testing and from order dealing to after sales service. Great attention has been paid on environmental protection and energy saving. The product well displays environmental protection and energy saving. In 2000, Donghua took the lead in gaining ISO14001 environment management certificate and thereafter passed the inspection of clean production and recycling economy, winning the title of "Zhejiang Green Enterprise". "We are always serving our customers with our best products." Donghua will always adhere to it enterprise spirit of being practical, innovative, efficient and excellent to make the top international chain drive.