M25 bolt

Bolt is one of the hexagonal bolts. Generally speaking, the mold manufacturer says that the length of the bolt is more than or equal to ten times of the diameter or the length is more than 300 mm, which is relatively complicated than the process of conventional hexagonal bolts. It is easy to bend when quenching. The quenching method and temperature need to be strictly controlled. The material selected for the bolt also has some influence on the bending of the bolt, Before finished products, they need to go through the straightening process to ensure the perpendicularity of the bolts.

Anti corrosion treatment of screw surface is a widely used method

Stainless steel screws are made of metal, and metal corrosion prevention methods mainly include four aspects, namely, the nature of the material itself, the environment of use, the interface between data and environment, and the design of improved metal structure. If stainless steel screws are made of complete corrosion resistant alloys, unless there is special demand, it is impractical in the economic sense, or the appearance of the screws is completely isolated from the environmental elements that cause corrosion, It may not work in practice and may be very difficult.

Improving the design of metal structure can improve the impact of special circumstances under certain conditions, but most stainless steel screws can not be fully modified in design, and their maintenance role is not permanent, so this method can not basically deal with problems, as long as the anti-corrosion on the interface, that is, the surface anti-corrosion treatment is currently widely used.