How to screw the security door, how to screw the security door

Updated on Security door 2024-09-12
1 answers
  1. Anonymous users2024-01-24

    Make a hole, then use the four guide to knock it in, and then reverse the board. 1. Screws are tools that use the physical and mathematical principles of the oblique circular rotation and friction of objects to tighten the mechanical parts of the utensils step by step. Screws are a generic term for fasteners, everyday colloquialism.

    2. Screws are indispensable industrial necessities in daily life: such as extremely small screws used in cameras, glasses, clocks, electronics, etc.; general screws for televisions, electrical products, musical instruments, furniture, etc.; As for engineering, construction, and bridges, large screws and nuts are used; Transportation equipment, airplanes, trains, automobiles, etc., are used with both large and small screws. 3. Screws have an important task in industry, and 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, and it is the first major invention of mankind according to the application field.

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