Generally, screws are mainly divided into two categories: metallic and non-metallic, with metallic materials dominating and widely used in various fields such as machinery, construction, and electronics.
Among metallic materials, the most common include carbon steel, stainless steel, alloy steel, copper and copper alloys, and aluminum alloys. Carbon steel screws are widely used in general mechanical connection scenarios, such as furniture and appliances, due to their low cost and good machinability. Their strength grade is usually classified through heat treatment processes, such as 4.8 grade, 8.8 grade, etc., with higher numbers indicating higher strength.
Stainless steel screws are widely used in fields with high corrosion resistance requirements, such as chemical engineering, marine engineering, and food processing. Common stainless steel materials include 304 and 316, with 316 stainless steel offering better corrosion resistance. Alloy steel screws have their strength, hardness, or corrosion resistance improved by adding other alloying elements, such as chromium, molybdenum, and nickel, making them suitable for applications with higher performance requirements.
Copper and copper alloy screws have unique applications in electronics, electrical engineering, and communications due to their good electrical and thermal conductivity and corrosion resistance.
Aluminum alloy screws are favored in aerospace, automotive manufacturing, and other fields due to their lightweight and high strength. In addition, screws made of special materials, such as titanium alloy screws, hold an irreplaceable position in high-end equipment manufacturing due to their extremely high strength and corrosion resistance.
When selecting screw materials, it is necessary to comprehensively consider factors such as the specific operating environment, load requirements, and cost budget to ensure that the screw performance meets the usage requirements.
