Screws are tools that use the physics and mathematics of an object's beveled circular rotation and friction to gradually fasten mechanical parts. Screws are a common term for fasteners, spoken daily. Screws are indispensable industrial necessities in everyday life: tiny screws such as cameras, eyeglasses, clocks, and electronics; general screws for televisions, electrical products, musical instruments, and furniture; and large projects for construction, construction, and bridges. Screws, nuts; transportation equipment, airplanes, trams, cars, etc. are screws and screws. Screws have an important task in the industry. As long as there is industry on the earth, the function of screws is always important. Screws are a common invention in people's life and production for thousands of years. According to application fields, it is the largest invention of human beings.
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