Expansion bolt expansion bolts, is the pipeline branch / hanging / bracket or device is fixed to the wall, the floor, a special threaded connectors used in the column. Grade expansion bolts into 45,50,60,70,80 Linyi stainless steel screws rivets, material mainly consists of austenite A1, A2, A4, martensitic and ferritic C1, C2, C4 Linyi stainless steel screws 321, which representation such as A2-70, "-", respectively before and after the bolt material and strength (1) bolting materials commonly used materials: Q215, Q235,25 and 45 steel, for important or special purpose screw fasteners can be. Selection 15Cr stainless steel screws 304,20Cr Linyi Linyi high mechanical properties of stainless steel alloy steel screws, 40Cr, 15MnVB, 30CrMrSi like. (2) The allowable stress of screw fasteners allowable stress and load properties (static, variable load), is coupled tightened preload control, and the need for material, structure, size and other factors relating to the threaded coupling. 4. Cutting Steel ① steel dubbed "Y", to distinguish high-quality carbon structural steel. ② the letter "Y" after the carbon content to the average carbon content of the few that, for example, the average carbon content of 0.3% of free cutting steel, the steel is "Y30". ③ higher manganese content, but also in the steel post marked "Mn", for example "Y40Mn". 304 stainless steel screw bolt screw washer Linyi Linyi stainless steel screws _ _ Jinan Road ground is provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) strong, credible, in Jinan, Shandong 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 into the brilliant and you work for a better future!