High strength fasteners are fasteners with high resistance to shear, yield coefficient and so on. Fastener is a kind of mechanical part which is used for fastening and connecting and is widely used. Fasteners, widely used in industries, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, mold, hydraulic industry and so on, in all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments and supplies and so on, can see every kind of fasteners. Is the most widely used basic pieces of machinery. It is characterized by a wide variety of specifications, different performance and use, and a high degree of standardization, serialization and generalization. Therefore, some kind of fasteners with national standard are also called standard fasteners, or standard parts for short.