Bolt, Nut, Customized Fastener manufacturer / supplier in China, offering ASTM A193 B7 B7m B16 A320 L7 L7m A194 2h 2hm Grade 7 7m Heavy Hex Nut Black Oxide Galvanized HDG PTFE Stud Bolt, High Precision DIN 975 Ss Metric Size Full Threaded Rod Unc, DIN975 Hot Sale High Quality High ASTM a 193 B7 Threaded Rod and so on.