Company: Jinan Daoqin company was founded in 2008, is located in the capital city of Shandong Province, the beautiful Springs - Jinan, Weifang stainless steel bolt ring, is a young company, with a young team, but we are very professional. Division I since 2011 to become China's largest professional stainless steel fastener manufacturers - strategic partner Zhejiang Dongming Stainless Steel Co Ltd, the 5 consecutive years Dongming "THE" "TONG" in Jinan, Shandong Province in the special distribution rights. 302 for using screws and self-tapping screw machining. 303 In order to improve cutting performance, type 303 stainless steel add a small amount of sulfur, for use bar machining nut. 304 is suitable for hot upsetting when machining stainless steel screws Weifang stainless steel bolt screws, bolts specifications such as long, large diameter bolts stainless steel bolts, they are likely to go beyond the scope of cold heading process. 305 is suitable for cold heading process when machining stainless steel screws, such as cold forming nuts, hex bolts. 309 and 310, they Cr content and Ni content higher than 18-8 stainless steel, suitable for working at high temperature stainless steel screws. People often think that magnets magnetic stainless steel, to validate the merits and authenticity, do not attract non-magnetic, considered a good, genuine; sucked by magnetic, it is considered counterfeit fakes. In fact, this is an extremely one-sided, no practical method to identify errors. Many types of stainless steel screws, according to the organizational structure at room temperature can be divided into several categories: 1. Austenitic: If 304,321,316,310, etc; 2. Martensite or ferrite: as 430,420,410 and the like; austenitic type is non-magnetic or weakly magnetic, martensite or ferrite is magnetic stainless steel bolt cotter pins, Qingdao, Jinan Road ground (Certified ), stainless steel bolts supplied by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) Shandong Jinan, hardware accessories leader over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Jinan Road ground in leadership with the staff warmly welcome all inquiries negotiations to create the Jinan Daoqin better future.