Screw Fasteners Production Materials And Applications

Common materials for screw fasteners are standard carbon steel, stainless steel and copper.

Carbon steel: low carbon steel, medium carbon steel, high carbon steel, alloy steel.

low carbon steel: carbon content less than 0.25%, mainly used for 4.8 grade screw bolts, 4 grade nuts, small screws and other products without hardness requirements.

Medium carbon steel: carbon content of 0.25%-0.6%, mainly used for 8-grade nuts and 8.8-class screw bolts.

High carbon steel: The carbon content is more than 0.6%, which is basically not used in the market.

Alloy steel: refers to steel containing some other alloying elements (such as silicon, manganese, chromium, nickel, vanadium, molybdenum, etc.) in addition to carbon. For grade 12.9 screws, mainly chromium-molybdenum alloy steel, such as SCM435: Adding alloying elements to the steel increases some special properties of the steel; the screw is used: SCM435 Ming molybdenum alloy steel.

Stainless steel: mainly divided into martensitic stainless steel, austenitic stainless steel, ferritic stainless steel and the like; performance level: 45, 50, 60, 70, 80 (commonly used sus200 series, sus302, sus304, sus316, sus410, etc.); imported materials are mainly Japanese products. (mainly divided into sus302, sus304, sus316 by level)

Copper: Commonly used materials are brass, bronze screw. (Mainly use H62, H65, H68 copper as standard parts)

Screw fasteners are an indispensable industrial necessity in everyday life. Very small screws for use in cameras, glasses, cell phones, clocks, electronics, etc. General screws for televisions, electrical appliances, musical instruments, furniture, etc. Large screws and nuts used in engineering, construction, and bridges. Traffic appliances, airplanes, trams, cars, etc. are used with large screws and small screws. Screws have an important task in the industry. As long as there is industry on the earth, the function of the screw fasteners is always important.

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