Fasteners are a type of mechanical parts that are used for fastening connections and are extremely widely used. All kinds of fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters and supplies. It is characterized by a wide variety of specifications, different performance and uses, and a high degree of standardization, serialization, and generalization. Therefore, some people call a type of fasteners that have national standards as standard fasteners, or simply standard parts. Fasteners are the most widely used mechanical basic parts. With my country's accession to the WTO in 2001, it has entered the ranks of major international trading nations. my country's fastener products are exported in large quantities to countries in the world, and fastener products from all over the world are also pouring into the Chinese market. Fasteners, as one of the products with a large import and export volume in my country, are in line with international standards. It is of great practical significance to promote Chinese fastener companies to the world and promote fastener companies to fully participate in international cooperation and competition. Strategic significance.　Due to the specific requirements of the specifications, dimensions, tolerances, weight, performance, surface conditions, marking methods, and acceptance inspection, marking and packaging of each specific fastener product.