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What are the models and specifications of common screws?

What are the models and specifications of common screws?

What are the models and specifications of common screws?

What are the models and specifications of common screws?

What
The commonly used screw specifications are: metric screws, American screws, and inch screws. The main categories include ordinary screws, machine screws, self-tapping screws and expansion screws.
 
A screw is a tool that uses the physics and mathematics principles of the oblique circular rotation of the object and the friction force to gradually tighten the utensils. Screws are a common term for fasteners, a daily spoken word.
 
Screws are indispensable industrial necessities in daily life: extremely small screws used in cameras, glasses, clocks, electronics, etc.; general screws in televisions, electrical products, musical instruments, furniture, etc.; as for engineering, construction, and bridges, large Screws and nuts; transportation equipment, airplanes, trams, cars, etc. are used for both large and small screws.
 
Screws have important tasks in industry. As long as there is industry on the earth, the function of screws will always be important. The screw is a common invention in people's production and life for thousands of years. According to the field of application, it is the first invention of mankind.

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