Ningbo Longding Fasteners co., ltd a fastener manufactuer and exporter in China with 15 years history. We set up our own factory in 2006. Our main products are bolt, nut and washer. I list some standard for bolt which we are produce for your check: DIN931,DIN933 DIN601, DIN558, din7990, DIN6914, DIN603, DIN6921 ISO4014, ISO4017 ANSI B18.2.1, ASTM A325, A490 AS1111,AS1252, AS1390, AS B108 The size is from M5 to M100(3/16" TO 4"). We also have many other kinds of bolt, nut and washer for your choose. Do you have any new inquiry? We would like to quote our price for your check and compare first.