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.