What is the material of screws?

There are many commonly used screw materials, which are roughly divided into two types: one is carbon steel, which is iron; the other is stainless steel, including stainless steel SUS201.304.316, etc.

Screw is a tool that utilizes the physical and mathematical principles of the object's inclined plane circular rotation and friction to gradually tighten the device. Screw is a common term for fasteners and a daily spoken language. Screws are indispensable industrial necessities in daily life: very small screws used in cameras, glasses, clocks, electronics, etc.; general screws used in televisions, electrical products, musical instruments, furniture, etc.; as for engineering, construction, and bridges, large screws are used. Screws and nuts; transportation equipment, airplanes, trams, automobiles, etc. use both large and small screws. Screws have important tasks in industry. As long as industry exists on the earth, the function of screws will always be important. Screws are a unique invention in people's production and life for thousands of years. According to the application field, it is the first invention of mankind.