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Screws can be divided into fine threads and coarse threads, which provide the friction. They are used to assemble or position two workpieces.

Standard: ASME B18.6.4; DIN7504N, DIN7504K, DIN7504P

Materials: Carbon Steel(1022+heat treatment), Alloy Steel, Stainless Steel.

Grade: CL4, 5, 6, 8, 10, 12; SAE J995 Gr.2, 5,8;  

Finish: plain,(blue, yellow) zinc plated, black oxide, dacromet etc

Supply ability:  around 900 tons per month.