Material: 12.9 grade high tensile alloy steel, black.They have superior rust resistance and the excellent of oxidation resistance in bad environment like high temperature, cold weather, and high humidity areas, which can ensure long time using.
Our screw thread is very sharp, clean and accurate. And the compact thread is not easy to out of shape and slid in the process of rolling. The deep and clear hex sockets and heads can make your working more easily.
Used widely in the the home, farm, business, automotive, and in industry machine, such as computer, electronic enclosures, exercise equipment, mowers, blowers, etc.