There are many ways to call bolts. Everyone may call them screws, bolts, standard parts and fasteners. Although there are so many names, they all mean the same thing, bolts. Bolt is the general term for fastener. The principle of the bolt is to use the physical and mathematical principles of the circular rotation of the inclined plane of the object and the friction force to fasten the implements and parts step by step. Bolts are indispensable in daily life and industrial production and manufacturing. Bolts are also known as the rice of industry. It can be seen that bolts are widely used. The application range of bolts includes: electronic products, mechanical products, digital products, electrical equipment, electromechanical products. Bolts can also be used in ships, vehicles, water conservancy projects and even chemical experiments. Anyway, bolts are used in many places. Such as precision bolts used on digital products. DVD, Micro bolts for cameras, glasses, clocks, electronics, etc; General bolts for TV, electrical products, musical instruments, furniture, etc; Large bolts and nuts are used for projects, buildings and bridges; Transportation equipment, aircraft, trams, automobiles, etc. are used with large and small bolts. Bolts have an important task in industry. As long as there is industry on the earth, the function of bolts will always be important.