Bolt, Nut, Customized Fastener manufacturer / supplier in China, offering DIN7991 ISO10462 M6 #8 #10 Black Oxide Carbon Steel Full Thread Yellow Chromate #6#8 Csk Head Socket Bolt, Allen Screw Stainless Steel #6 #8 #10-32 82degree 304 316 310 A193b8 DIN7991 Csk Socket Head Bolt, M6*50mm DIN 7991 Grade 10.9 12.9 Carbon Steel Black Oxide Countersunk ASTM A193 B7 Csk Head Socket Screw for Oil&Gas Industry and so on.