... 3. For free sample High Quality Industrial ChainWhy Choose Us1. Hangzhou Donghua Chain Group Co., Ltd established in 1991, we have ... square meters, have more than 1,800 sets of advanced equipment and over 3,100 highly skilled employees, the annual ... obtained ISO9001, ISO14001, ISO16969, AAA and API certificates.1.Industrial Chain Parts2.Production flow chart1.incoming material2.inspection 3.production ...