Screw wire is the raw material of screw manufacturing. Because the screw material is different, the screw strength level is different, the screw mechanical properties are different and so on. When we choose to produce screws, the production of raw. The wire mainly has two kinds of spring line and screw line, as the name suggests: screw line is mainly used to make screws, and the spring line is used to make springs or other requirements of elastic hardware products. Others such as brightening line, hydrogen annealing line, electrolytic line, axle hairpin line, etc. Tensile strength 1500-2000. MAIN PRODUCE SIZE:301，304