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What are the classifications of screws?

Update:24-12-2021
Summary:

A screw is a tool that uses the physics and mathematics […]

A screw is a tool that uses the physics and mathematics of the oblique rotation of the object and the friction force to gradually tighten the utensils and parts. It is an indispensable industrial necessity.

In fact, screws are a general term for fasteners, and those with external threads can be called "screws". Screws are also called screws and screw rods. Screws are generally called wood screws, which are pointed at the front end and have a larger pitch. They are generally used to fasten wooden and plastic parts. The screw rod is a machine screw with a flat front end. The pitch is small and uniform. Generally used to fasten metal and machine parts.

Screws can be divided into many categories according to different purposes: the main categories include ordinary screws, machine screws, self-tapping screws and expansion screws; machine screws can be divided into longitudinal fastening screws and horizontal expansion screws; they can also be divided into three categories according to the thread: triangle Threads, triangular threads for pipes, trapezoidal threads, square threads.

Common screw materials are carbon steel (low carbon steel, medium carbon steel, high carbon steel and alloy steel), stainless steel, aluminum alloy, brass, bronze, antimony copper, etc.
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