3. Carbon tool steel ① steel dubbed "T", so as not to be confused with other types of steel. ② The numbers indicate the carbon content of steel, with an average carbon content of a few thousandths of representation. For example "T8" represents the average carbon content of 0.8%. ③ higher manganese content Linyi 304 screws, steel last marked "Mn" Linyi stainless steel rivets, such as "T8Mn". Phosphorus, sulfur ④ High quality carbon tool steel, than low-quality carbon tool steel, the steel final endorsement letter "A" in Linyi, to show the difference, such as "T8MnA". Stainless steel screws GB / T 3098.3-2000 Mechanical properties of fasteners set screws GB / T 3098.4-2000 Mechanical properties of fasteners fine thread GB / T 3098.5-2000 Mechanical properties of fasteners tapping screws GB / T 3098.6- 2000 Mechanical properties of fasteners stainless steel bolts, screws and studs GB / T 3098.7-2000 Mechanical properties of fasteners rolling screws GB / T 3098.8-1992 Mechanical properties of fasteners screwed deputy GB / T 3098.9-2002 Mechanical properties of fasteners torque type steel hexagon nuts GB / T 3099.1-2008 Fasteners term threaded fasteners, pins and washers Linyi stainless steel rings, screws stainless steel screws, stainless steel nuts, stainless steel screws, stainless steel hose clamps, stainless steel rivets, stainless steel rivet nut, screw 316 stainless steel screws 304 stainless steel screw rings Linyi, Jinan Road ground (certified), Linyi 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.