Ningbo Chengyu Construction Machinery Co., Ltd. is a factory specializing in heat treatment for several decades,producing various hammer accessory machinery and excavator parts manufacturing.We are expert in design,development,production,and export’s professional company.We using domestic and international advanced production equipment and metal materials to produce the high quality parts.At present,users over the railways, highways, utilities, municipalities, ports, oil and mining industries. Our main products have been exported to South Africa, Russia, the United States, Brazil, Southeast Asia and other countries. Cheng Yu Construction Machinery covers an area of of 100 mu, more than 500 employees, annual output more than 15000 tons, market has a solid customer base. The company's main products are: Cheng Yu hammer drill steel rods, the pick drill, hammer piston on the cylinder liner, hammer and the bolt, hammer clamping screw flat pin,cylinder block,outer&thurst bush,hydraulic breaker chisel, excavator bucket teeth,adapter and so on.