Introduction to screws

The screw is a tool that uses the physical and mathematical principles of the oblique circular rotation of the object and the friction force to tighten the tool parts step by step. Screws are the common language of fasteners and the daily oral language. Screws are indispensable industrial necessities in daily life: such as tiny screws used in cameras, glasses, clocks and watches, and electronics; General screws for TV, electrical products, musical instruments, furniture, etc; For engineering, construction and bridge, large screws and nuts are used; Transportation appliances, airplanes, trams, cars, etc. are used with large and small screws. Screws have an important task in industry. As long as there is industry on the earth, the function of screws will always be important. Screw is a common invention in people's production and life for thousands of years. According to the application field, it is the first invention of mankind.
Screw, also known as "Screw" (screw) and "screw" (screw rod). In fact, screw is a general term, while screw and screw rod are different from each other. Screws are generally called wood screws; It is the kind with a sharp head at the front end, with a large pitch. It is generally used to fasten wooden parts and plastic parts. The screw rod is a machine screw (machine screw), which is the type with flat head at the front end. The screw pitch is small and uniform. It is generally used to fasten metal and machine parts
The screw is mainly used to connect the two workpieces and play a fastening role.