The mechanical industry is one of the major users of fasteners. Because China has a relatively late understanding of the importance of mechanical parts in the machinery industry and lack of investment for a long time, the entire industry has a poor foundation, a weak foundation, and weak strength. In particular, with the increase in the level of China's mainframe, bottlenecks in mechanical components lagging behind those of the host are becoming increasingly apparent. Today, although the state has given certain support in terms of technology introduction, technological transformation, and research and development, there is still a small gap compared with the current market demand and foreign standards. The specific manifestations are: the product variety is small, and the level is low. Quality is unstable, early failure rate is high, and reliability is poor. Fasteners are the main basic parts of the machinery industry. The development of the machinery industry also places higher demands on fastener products. Domestic common standard fasteners have been oversupply, while high-end fasteners (high temperature, special-shaped, titanium-plastic composite, special performance fasteners, etc.) are in short supply, and rely on imports. The State Bureau of Machinery classified "ordinary standard fasteners" as a restricted development product, and "high-strength special-shaped fasteners" as a product that is currently encouraged to develop. High-strength fasteners With the improvement of the industrialization level and technological progress of the country, the use of the fasteners has gradually increased.