1. wallboard self-tapping screws for gypsum wallboard and other connections between metal keel. The threads of the threaded stud thread also has a high surface hardness (≥HRC53), can be made without a pre-condition of Qingdao stainless steel rivet holes quickly screwed into the keel in Tai'an stainless steel rivets to form connections. 2. stainless steel self drilling screws with ordinary tapping screws is that different from ordinary self-tapping screws in stainless steel rivets connecting Zaozhuang, subject to drilling (drill thread bottom) and tapping (including fastening) two processes ; and self-drilling tapping screws when connected, it will be drilled and tapped two processes once the merger is completed. It first screw in front of the drill to drill, and then they were tapping screws (including fastening), saving construction time, improve construction efficiency. TOP-LOCK locking washer is composed of two identical pads, outside of each piece with a radial embossed surface, medial oblique tooth surface. Advantages TOP-LOCK locking washer: 1. Make sure the vibration remains under strong clamping force connections, and better than relying on friction to lock fasteners; 2, to prevent the bolts loosening caused by vibration, longer related problems caused due to the occurrence of loose fasteners; Laiwu steel rivets, Jinan Road ground (certified), stainless steel rivets provided 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 is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Jinan Road ground in leadership with the staff warmly welcome all inquiries negotiations to create Jinan Daoqin a better future. You can also access (www.daoqinshangmao.com/supply_details_50450070.html), for more information about the company.