Fasteners are used for fastening and wide range of applications of a class of mechanical parts. In all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, equipment, instruments and supplies, such as the above, we can see a variety of fasteners. It is characterized by many different specifications, performance, use of different, and standardization, serialization, universal species is also very high degree. So it was also a kind of national standards has been called fasteners standard fasteners, or simply as standard.
　　Fasteners include: bolts, studs, screws, nuts, washers, pins, retaining rings, studs, rivets, connecting deputy, wood screws, self-tapping screws.
　　Due to the specific requirements of each specific fastener product specifications, dimensions, tolerances, weight, performance, surface condition, marking methods, and the acceptance inspection, marking and packaging projects are respectively defined in several countries (industry) standard , for example, British, German and US system.
　　Fasteners are widely used machine parts. With China's accession to WTO and entered the ranks of the international trading nation. China's fastener products are exported to countries around the world, the world of fastener products are constantly influx of Chinese market. Import and export volume of China as one of the larger fastener products with international standards, to promote Chinese enterprises to the world of fasteners, fastener enterprises to promote the full participation of international cooperation and competition, are displayed with the important significance and strategic significance.