The screw is a tool that uses the physics and mathematical principles of the circular rotation of the object and the frictional force to gradually tighten the object. Screws are a general term for fasteners, everyday spoken language. Screws are indispensable industrial essentials in daily life: extremely small screws such as cameras, glasses, clocks, electronics, etc.; general screws for televisions, electrical products, musical instruments, furniture, etc.; for engineering, construction, and bridges, large Screws and nuts; traffic appliances, airplanes, trams, cars, etc. are used for both size and size. Screws have an important task in the industry. As long as there is industry on the earth, the function of the screw is always important. Screws are the common inventions in people's production and life for thousands of years. According to the application field, it is the first invention of human beings.
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