Zhejiang Zhongsu Screw Manufacturing Co., Ltd is one of the largest manufacturers in china.We specialized in making all kinds of plastic screw barrel for plastic machine.As factury direct,all screw barrel with high competitive price and good quality. We strictly select high-quality alloy steel (38CrMoAIA) to produce screws and barrels. Our products have features of high precision, wear resistance and corrosion resistance through heat treatment, Nitriding treatment, Hard-chrome electroplating, Bimetallic alloy welding and other processing ways. We can manufacture most types of extruder screws, injection moulding screws, twin screws and rubber screws used in the plastics, rubber industry&＃39;s. We can also refurbish any size of extruder, ranging from the smallest lab screw up to screws of 600m/m dia and 6 metres in length, using all types of Hard facing materials. Our products have been distributed to Europe, America, Oceania, Asia, Africa, the Middle East, etc. We will make more efforts and continue to provide perfect quality and services for our customers.