Screws have many names, and people may use different terms. Some call them screws, some call them screw studs, some call them standard parts, and some call them fasteners. Although there are many names, they all mean the same thing: a screw. "Screw" is the general term for fasteners. The principle of a screw is based on the physical and mathematical principles of the inclined plane, circular rotation, and friction, used to gradually tighten objects and machine parts.
Screws are indispensable in daily life and industrial manufacturing, hence they are often called the "rice of industry." Screws are used in a wide range of applications, including electronic products, mechanical products, digital products, electrical equipment, electromechanical products, ships, vehicles, water conservancy projects, and even chemical experiments.
Screw types vary widely, from extremely small screws for eyeglasses to large screws used in heavy electrical engineering. The precision of screws is typically 6g grade (Grade 2, US standard "IFI" is 2A thread), while coarse screws used in construction engineering are 1g grade.
The wide range of applications for screws results in a large market, leading to a large number of screw manufacturers. When selecting a professional screw manufacturer, purchasing agents need to first understand some basic professional knowledge about screws, such as screw classification standards and specifications and American screw specification tables.
