There are a lot of names for screws. Each person's name may be different. Someone called a screw, someone called a screw, someone called a standard, someone called a fastener. Although there are so many called, but the meaning is the same, are screws. Screws are the general term for fasteners. The principle of the screw is to use the physical and mathematical principles of the bevel circular rotation and friction of the object, step by step to fasten the objects and parts of the tool.
　　Screws in daily life and industrial manufacturing which are indispensable, the screw is also known as the industrial rice. Can be seen a wide range of screws. The use of screws are: electronic products, mechanical products, digital products, electrical equipment, mechanical and electrical products. Ships, vehicles, water conservancy projects, and even chemical experiments are also useful screws. Anyway, there are many places to use screws. Such as digital products used above precision screws. Miniature screws used in DVDs, cameras, eyeglasses, watches and clocks, electronics, etc .; general screws in TVs, electrical products, musical instruments, furniture, etc .; as for engineering, construction, bridges, large screws and nuts; traffic apparatus, airplanes, trams, And so the size of screws and use. Screws have an important industrial task, and as long as there is industry on earth, the function of screws is always important.
　　The type of screw, whether it is a small screw used in glasses or a large heavy-duty engineering with a large variety of screws. The accuracy of the screw is usually 6g level (2, the United States specifications "IFI" for the 2A teeth), construction projects with the rough screw 1g level.
　　The scope of the use of screws is so wide, so the screw market is certainly larger, the demand is certainly relatively large, but also in the screw industry, the production of screws will certainly be more. Purchasing professionals in the selection of screw procurement manufacturers, we must first understand some of the basic knowledge of the screw, such as screw classification standards and specifications American screw table.