Screw is the use of the object of the slant circular rotation and friction of the physics and mathematical principles, progressive fastening tools of the machine tool, screw is the general statement of Fasteners, daily spoken language.
Screws for daily life indispensable industrial necessities: such as cameras, glasses, watches, electronics, such as the use of minimal screw; television, electrical products, musical instruments, furniture and other general screws; As for engineering, construction, bridges, the use of large screws, nuts, traffic apparatus, aircraft, trams, automobiles and so on the size of the screw.
Screw in industry has an important task, as long as the existence of the Earth on the industry, the screw function is always important, screw is for thousands of years of people's production and life of the common invention, according to the field of application, it is the first big invention of mankind.
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