304 screws, bolts 316 316 machine screws, stainless steel rivets, stainless steel lock washer 13. Electrician pure iron ① its designation by the letters "DT" and numbers, "DT" indicates electrical iron, numbers indicate the sequence number of different grades of stainless steel fine screw Tai'an, for example DT3. ② after the number of letters applied electromagnetic properties: A-- advanced, E-- premium, C-- Laiwu steel super fine screw, for example DT8A. 3 length dimension editor steel length dimension is the most basic dimensions of stainless steel various steel fine thread screw, steel refers to the length, width, height, diameter, radius, diameter, outside diameter and wall thickness of equal length. Legal units of measurement steel length in meters (m), centimeters (cm), millimeters (mm). In the current habits, but also useful inch (") Qingdao stainless steel fine screw representation, but it is not the legal units of measurement. Fastener, also known as screw, not the same name and himself, but the inner meaning is the same. Each tight a kind of mechanical fasteners and parts collectively when two or more parts (or components) fastening become a whole employed. fastener product standards should involve some aspects of the content of .1 fastener product dimensions criteria: content specified in the basic dimensions of the product; threaded products, including basic thread size, thread ending, shoulder distance, the end of the size undercuts and chamfers, outer threaded part .2 standards and other aspects, technical conditions of fastener products mainly include content production tolerances, mechanical properties, surface defects, surface treatment, product testing standard terms and the corresponding specific provisions of the .321 stainless steel bolts, 316 stainless steel flat pad, 316 stainless steel expansion bolts stainless steel 304 stainless steel locking screw fine thread screw Laiwu, Jinan Road ground (certified), stainless steel fine screw is 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 implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs in leadership with the Jinan Daoqin staff warmly welcome all inquiries negotiations to create the Jinan Daoqin better future.