High strength fastener is the fastener Du with high shear resistance and yield coefficient.

Fastener is a kind of mechanical parts which is widely used for fastening and fixing connection. Fasteners are widely used in various industries, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, mold, hydraulic and other industries. Various kinds of fasteners can be seen in all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments and supplies. They are the most widely used mechanical basic parts. It is characterized by a variety of specifications, performance and use of different, and standardization, serialization, universal degree is also very high. Therefore, some people call the fastener of existing national standard as standard fastener, or referred to as standard fastener for short.