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, material mainly consists of austenite A1, A2, A4 stainless steel micro screws Tai'an, martensitic and ferritic C1, C2, C4, which represents methods such as A2 -70 "-" before and after, respectively, bolt material and strength (1) bolting materials commonly used materials: Q215, Q235,25 and 45 Zibo stainless steel micro screws, for important or special purpose stainless steel threaded coupling Qingdao. micro screws, the choice of high mechanical properties of alloy steel 15Cr, 20Cr, 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. 3, screw product acceptance inspection, marking and packaging criteria: project eligibility checks specified when the factory acceptance quality levels and sampling program, as well as the content method and packaging requirements of the product logo. Stainless steel nylon lock nuts micro screws, stainless steel lock nut, stainless steel welded nut 4, standard parts, fasteners, screws, screws standard labeling method: specify the content of the complete product labeling method and simplified methods of marking. 5, fastener standards in other areas: terminology such as standard fasteners, fastener product weight standards. Weifang stainless steel micro screws | stainless steel micro 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!