Fasteners are a class of mechanical parts that are used for fastening connections and are widely used. Fasteners, the use of a wide range of industries, including energy, electronics, electrical, mechanical, chemical, metallurgical, mold, hydraulic and other industries, in a variety of machinery, equipment, vehicles, ships, railroads, bridges, buildings, structures, tools, instruments, chemicals, instruments and supplies, etc., can see a variety of fasteners, is the most widely used mechanical foundation parts. It is characterized by a wide variety of specifications, different performance uses, and standardization, serialization, generalization of the degree is also extremely high. Therefore, some people also have a national standard for a class of fasteners called standard fasteners, or simply referred to as standard parts.
