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The screw is a tool that uses the physical and mathematical principles of the circular rotation of the object's inclined surface and the friction force to gradually tighten the objects. "Screw" is a general term for fasteners, a spoken word in everyday life.
Screws are indispensable industrial necessities in daily life: such as the smallest screws used in cameras, glasses, clocks, electronics; general screws on TV, electrical products, musical instruments, furniture and other items; Use large screws and nuts for engineering, construction and bridges ; use large and small screws for transportation equipments, airplanes, trams, and automobiles. Screws have important tasks in industry. As long as there is industry on the earth, the function of screws is always important.