molybdenum screw

The screw is a circular rotating use of the inclined plane of the object and the friction of the physics and mathematical principles, step by step fastening implements parts of the tool. The screw is a generic statement of the fastener, the daily spoken language. Screws for industrial necessities: an integral part of daily life such as cameras, glasses, watches, electronics and other used a very small screw; TV, electrical products, musical instruments, furniture, general screw; As for engineering, architecture, bridges, using the large screws compared to the size of the screw of the nut; transportation appliance, aircraft, trams, cars and other used. Screw in industry has an important task, as long as on Earth, there are industrial, the function of the screw is always important. The screw is the co-inventor of the lives of thousands of years for people to produce, in accordance with the application field of view, it is human invention.