There are many names for screws. Different people may call them differently. Some call them "nails", some call them "screw nails", some call them "standard parts", and some call them "fastening components". Although there are so many names, the meaning is the same - they are all screws. Screws are the general term for fastening components. The principle of screws is based on the physics and mathematics of the inclined plane, circular rotation, and friction force, and it is a tool for gradually fastening machine parts and components.

Screws are indispensable in both daily life and industrial production and manufacturing. Screws are also known as the "rice of industry". This clearly shows the wide application of screws. The application scope of screws includes: electronic products, mechanical products, digital products, power equipment, mechanical-electrical products. They are also used in ships, vehicles, water conservancy projects, and even in chemical experiments. They are used in almost every place. For example, precision screws are used in digital products. Micro screws are used in DVD players, cameras, glasses, clocks, and electronics; general screws are used in televisions, electrical products, musical instruments, and furniture; for engineering, construction, and bridges, large screws and nuts are used; for transportation equipment, aircraft, trams, and cars, both large and small screws are used. Screws play an important role in industry. As long as there is industry on Earth, the function of screws will always be important.

The types of screws vary greatly, ranging from the very small screws used in eyeglasses to the large screws used in large-scale electrical engineering projects. There are numerous types of screws. The precision of screws is usually at the 6g level (2 level, the "IFI" standard in the United States is 2A thread). The coarse screws used in construction projects are at the 1g level.

The application scope of screws is so extensive that the screws market must be quite large, and the demand is definitely considerable. Moreover, there are surely many manufacturers producing screws in the screws industry. When buyers choose professional screw purchasing manufacturers, they definitely need to first understand some professional basic knowledge about screws, such as screw classification standards and specifications, as well as the American screw specification table.