What is the function of a screw?

The main role of the screw is to connect the two work pieces together, the role of fastening, screws are used on general equipment, such as mobile phones, computers, cars, bicycles, all kinds of machine tools, equipment, almost all the machines have to use screws.  

Screws are indispensable industrial necessities in daily life: such as cameras, glasses, clocks and watches, electronic use of extremely small screws;  General screws for televisions, electrical products, Musical Instruments, furniture, etc.  As for engineering, construction, bridge use large screws, nuts;  Transportation equipment, aircraft, trams, cars and other screws for the size and use.  

Screws have important tasks in industry. As long as there is industry on the earth, the function of screws is always 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 big invention of human beings.