Our company have experts who have engaged the design and processing of plastic machine parts yearly. We can make the spray coating alloy technics on the surface of nitriding screw according to the client’s demands or deal with hard chromium plating, which can make the surface thickness only about 0.01mm-0.50mm. The technology above-mentioned would improve screw’s service life. And also we can provide so many service such as call mapping、design、rehandling、custom-tailor and the repair of screws.