M2 carbon steel cross recess drive black zinc precision screw

Industry knowledge：

Difference between Dacromet screw and zinc plated screw

1、 Dacromet coated screw. Dacromet is a kind of coating, which can be sprayed and centrifugally dried. The appearance of the coating is usually silver white, and the appearance color can also be treated according to the customer’s requirements.Dacromet screw salt spray test can generally reach 240-2000 hours, and Dacromet coating does not pollute the environment.

2、Ordinary zinc plated screw, is a metal anti-corrosion method, which is mainly used in metal structures and facilities in various industries. It is to put the derusted steel parts into the molten zinc at about 500 ℃, so that the zinc layer is attached to the surface of the steel members, so as to achieve the purpose of anti-corrosion.The salt spray test of zinc plated screws can reach 400-500 hours.