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For the surface treatment of fasteners, people generally pay attention to aesthetics and anti-corrosion, but the main function of fasteners is to fasten parts, and surface treatment also has a great influence on the fastening performance of fasteners, so choose the surface When handling, the factor of fastening performance should also be considered, that is, the consistency of installation torque-pre-tightening force.

Spring washers are widely used in load-bearing and non-load-bearing structures of general mechanical products. They are characterized by low cost, convenient installation, and are suitable for parts with frequent assembly and disassembly. The automatic selection of washers is included, but the anti-loose ability of spring washers is very low! Especially in European and American countries that require high reliability products, the adoption rate is extremely low, especially the important load-bearing structural connection parts have long been abandoned.

Washer refers to the part that is cushioned between the connected part and the nut, generally a flat metal ring, used to protect the surface of the connected part from being scratched by the nut and disperse the pressure of the nut on the connected part.

High-strength fasteners refer to fasteners with relatively high performance levels, including high-strength bolts, high-strength nuts, high-strength washers, high-strength screws, and high-strength studs.

High tensile bolts can withstand larger loads than ordinary bolts of the same specification. The material of ordinary bolts is made of Q235 (A3). The material of high-strength bolt 35 # steel or other high-quality materials is heat treated after being made to improve the strength. So what is the difference between high tensile bolts and ordinary bolts? Let ‘s take a look together.