... AISI, GB . material : carbon steel , stainless steel , alloy steel . bolt boltstandard : JIS , DIN . AISI, GB .material : carbon steel , stainless ... nickel and so on.We are professional manufacturer and exporter for different kinds of fasteners and metal parts . We can ... , alloy steel , stainless steel , zinc , and so on . Our strong R&D and QC department can control the ... to contact us at once . bolt