7. Spring steel spring steel can be divided according to the chemical composition of carbon spring steel and alloy spring steel two categories, its stainless steel representation Linyi 316, the former is basically the same high-quality carbon structural steel Linyi stainless steel cotter pin, which is basically an alloy structural steel. 8. Rolling steel ① preceded by the letter "G", expressed rolling bearing steel class. Stainless steel bolts, screws Linyi 304 stainless steel drilling screws, carbon content of 316 screws ② carbon chromium bearing steel steel is not marked, the chromium content of a few thousandths. For example GCr15. Steel representation carburizing bearing steel, structural steel and alloys basically the same. SJ 2494-1984 Cross recessed oval head screw fasteners SJ 2495-1984 SJ 2496-1984 fastener self-threading fastener heat-treated steel tapping screws - Mechanical properties of fasteners SJ 2497-1984 Cross recessed pan head tapping screw fastener SJ 2498-1984 Cross recessed countersunk head self-tapping screw fastener SJ 2499-1984 Cross recessed countersunk head self-tapping screw fastener SJ 2500-1984 Cross recessed oval head tapping screws SJ 2501-1984 Fasteners Cross recessed pan head tapping screws stainless steel flange drilling screws, nuts 316, 316 stainless steel pan head Phillips screws. 304 hexagonal bolts, hose clamps Linyi 316 stainless steel welding screws, stainless steel slotted screws blind rivets, stainless steel studs Linyi stainless steel cotter pin | Jinan Road ground (certified) | Linyi by Jinan Road ground stainless steel 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 demand. Jinan Road ground in leadership with the staff warmly welcome all inquiries negotiations to create the Jinan Daoqin better future.