Grades that editors 1. carbon structural steel ① by Q + digital + quality rating symbols + deoxy method symbols. Its steel dubbed "Q", on behalf of the yield point of Heze stainless steel bolts, the latter figure represents the yield point value, expressed in units of MPa yield point such as Q235 (σs) of 235 MPa of carbon steel. ② when necessary, can be marked symbols representing steel quality level and deoxygenation methods. Quality rating symbols are A, B, C, D. Deoxy method symbols: F denote boiling steel; b represents a half-killed steel: Z represents killed steel; TZ indicate special killed steel, killed steel without standard symbols, namely Z and TZ can not standard. For example Q235-AF represent Class A boiling steel. GB / T 16823.2-1997 General tightening threaded fasteners GB / T 16823.3-1997 threaded fastener tightening test method GB / T 16938-2008 Fasteners Bolts, screws, studs and nuts - General technical requirements GB 17464-1998 Connecting devices require GB copper conductors with screw-type and screwless security type clamping units / T 17645.511-2010 Industrial automation systems and integration - Parts library - Part 511: Mechanical systems and components for general use: Fasteners reference dictionary GB / T within 2670.1-2004 hexalobular pan head self-tapping screws. Stainless steel screws, stainless steel nuts, stainless steel disc spring, Linyi stainless steel stud bolts, U-bolts stainless steel bolts, stainless steel hose clamps Tai'an bolts, stainless steel gasket, stainless steel welded screws, the screws 304, 316 bolts. Stainless steel rivets, stainless steel pin. Binzhou stainless steel bolts, Jinan Road ground (certified), stainless steel bolts supplied 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.