Extra long bolts are mechanical parts, cylindrical fasteners with externally threaded nuts. A fastener consisting of a head and a screw must be fitted with a nut to facilitate fixing and connecting two components with a through hole. This connection method is called bolt connection. If the nut is unscrewed from the bolt, the two components can be separated, so the bolt connection is a detachable connection. There are many names for extra long bolts. Everyone calls him differently. Some people call them extra long bolts, some people call them extra long screws, and some people call them fasteners. Despite so many names, the meaning is the same, all extra long bolts. Bolt is the general designation of fastener. Bolt is a kind of tool that gradually tightens equipment parts by using the physical and mathematical principles of oblique circular rotation and object friction. Extra long bolts are indispensable in daily life and industrial manufacturing. Bolt is also referred to as the rice of manufacturing industry. It can be seen that bolts are commonly used. Bolt is used for electronic product, engineering product, data product, electrical equipment, electrical product. Bolt is also used in boats and ships, automobile, water engineering and even chemical experiment operation. Regardless, bolts are used in many areas. Especially suitable for high-precision bolts used in electronic products. DVD, camera small bolts, glasses, clocks, electronics, televisions, electronic products, musical instruments, furniture and other general purpose bolts; for engineering, construction and bridges, use large bolts and nuts; for conveyors, airports, electric vehicles, vehicles, etc., use large bolts and small bolts. Bolts not only play a key role in industrial production, they are indispensable everywhere in people's daily life. As long as there is industrial production generally on the earth, the function of bolt will be main always.