Screws have a variety of names, the names of everyone may have different, called a screw, is called a screw, is called a standard parts, called a fastener. Although there are so many words, but the meaning is the same, all screws. The screw is the general view of the fastener. The principle of the screw is to use objects of the inclined plane circular rotation and friction of the physics and mathematics principle, gradual tightening implements parts of the tool.Screw in daily life and industrial production, is a little not, the screw is also known as the industrial meter. The use of visible screws. The use of screw: electronic products, mechanical products, digital products, power equipment, mechanical and electrical machinery products. Ships, vehicles, water conservancy projects, and even chemical experiments are also useful to screw. Anyway, it's a screw that's more than a screw.. Special precision screws as used in digital products. DVD, use the camera, glasses, watches, electronics and other micro screw; TV, electrical products, instruments, furniture and other general screw; as for the engineering, construction, bridges use large screws, nuts, transportation equipment, aircraft, cars, automobile and other for screw size and use. The screw is important in industry, as long as there is industry, the function of screw is always important..Type of screw, regardless of the use of a small screwdriver or a large power engineering with a large screw its type of a lot of. Screw precision is usually 6G grade (grade 2, the specification of "IFI" for the 2A, with the teeth) construction project for 1g crude.The scope of application of screw so widely, so screw market certainly larger, demand will certainly relatively large and in screw industry in the production of screws manufacturers certainly is more also. When purchasing a professional screw procurement manufacturer, you must first understand the basic knowledge of some of the screws, such as screw classification standards and American screw specifications.