Martensitic stainless steel: 410 and 416 can be heat strengthened, hardness 35 ~ 45HRC, good machining performance for general purpose corrosion resistant stainless steel screws. 416 higher sulfur content Jinan carriage bolts, is cutting stainless steel. 420, sulfur? R0.15%, improve the mechanical properties of Jinan carriage bolts designed for, you can heat strengthened, maximum hardness value 53 ~ 58HRC, for applications requiring high strength stainless steel screws. Precipitation hardening stainless steel: 17-4PH, PH15-7Mo, they can get more than the usual 18-8 stainless steel higher strength, they have been used for high strength, corrosion-resistant stainless steel screws. Type 302 for using screws and self-tapping screw machining. 303 In order to improve cutting performance, type 303 stainless steel by adding a small amount of sulfur, for the use of bar machining nut. 304 is suitable for hot upsetting when processing stainless steel screws, bolts specifications such as long carriage bolt factory in Jinan, Jinan large diameter bolts carriage bolts wholesale, they are probably beyond the scope of cold heading process. 305 is suitable for cold heading process when machining stainless steel screws, such as cold forming nut, hex bolts. 309 and 310, and their Cr content and Ni content than the 18-8 stainless steel high, suitable for working at high temperature stainless steel screws. Jinan wholesale carriage bolts, carriage bolts, Jinan, Jinan Road ground is provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (http://www.daoqinshangmao.com) strong, credible, in Jinan, Shandong and other hardware accessories industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jinan Road ground and you work into the brilliant, for a better future! You can also access (www.daoqinshangmao.com/supply_details_42983925.html), for more information about the company.