Production and processing technology of fastener nuts and washers

2023/07/24

Our factory has been in business for many years and has rich experience in the fastener industry. Over the years, our factory has been adhering to honesty and trustworthiness, excellent corporate culture, and has brought comprehensive and complete service items to many customers and friends. Below, our company will introduce the production and processing technology and requirements of high-strength nuts and washers: High-strength nuts should be made of high-quality carbon steel. In order to facilitate identification, there is a convex mark on the top surface of the head of the high-strength bolt, and there is a mark of the manufacturer. The high-strength nuts currently used in the market are made of high-quality carbon steel No. 45 or No. 35. The former one is formed by hot heading process, and the latter one can be formed by cold heading process. The manufacturing process steps of high-strength nuts include breaking material, forming, heat treatment, tapping, blackening and other processes. When the high-strength nut project is accepted, in addition to the specifications and surface smoothness of each part must meet the requirements of the national standard, it is also necessary to carry out the load test and hardness test for the finished product. The high-strength washers for this supporting facility are stamped from No. 45 high-quality carbon hot-rolled strip steel. The holes and steep slopes are formed at one time, followed by heat treatment and blackening. Before heat treatment, put the gasket into the drum, and rotate the drum to make the burrs and burrs of the gasket collide with each other and wear off. During product engineering acceptance, except that the size meets the national standard, only the surface hardness test is done. Four points are randomly measured, and the average value of the last three points is taken. The surface strength should be HRC36-45. The 45° steep slope rounding of the nominal diameter of the gasket is very important. If the specifications do not meet the requirements, the bolts will not fall completely during the decoration, or the bearing surface at the top of the bolt head will not be closely attached to the surface of the gasket, which will affect the assembly quality.

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