... . Prompt Delivery 3. Experienced Staff Engine Mechanism Timing Chain: Why Choose Us ?1. Hangzhou Donghua Chain Group Co., Ltd established in 1991, we ... chains, conveyor chains, dragging chains, agricultural chains and so on;4. we have obtained ISO9001, ISO14001, ISO16969, AAA and API certificates ... , 25-1, 25-2, 219H, C219H, 270H and so onPitch : 6.350 mm ~ 9.525 mm 2.Certificate 3.Pictures We ...