A-2: Length Code: Screw Length: Metric screw directly labeled screw length in mm of the total length of the screw holes marked Heze stainless steel ring, counting only the length below the head, without head height but flat. screw exception, the total length of the screw head height of the label containing .A-3: Drive Code / head cross ditch, features common specifications fold Edit this paragraph a Slotted:.. word (Minus) b Phillips:. Cross (Plus ) stainless steel screws, stainless steel screws, stainless steel bolt holes Liaocheng ring 304 screw bolt 316 expansion bolt expansion bolts, is the pipeline branch / hanging / bracket or device is fixed to the wall, the floor, the use of a column Species of special threaded connectors. Grade expansion bolts into 45,50,60,70,80, material mainly consists of austenite A1, A2, A4, 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 steel, for important or special purpose stainless steel threaded coupling hole with a ring, can be used 15Cr Yantai. Stainless steel hole with a ring, 20Cr, 40Cr, 15MnVB, 30CrMrSi and other mechanical properties of high-alloy steel. (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. Binzhou stainless steel hole with a ring, Jinan Road ground (certified), stainless steel hole provided by Jinan Daoqin Trading Company with a ring. 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.