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Fastener is a kind of mechanical parts used for fastening and connection and widely used. Fasteners are widely used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, mold, hydraulic pressure and so on. Various fasteners can be seen in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments and supplies, which are the most widely used mechanical basic parts. It is characterized by a wide variety of specifications, different performance and uses, and the degree of standardization, serialization and generalization is also very high. Therefore, some people also call a class of fasteners with existing national standards as standard fasteners, or standard parts for short.