... , materials, finishes and standards . self-tapping screwstandard : JIS , DIN . AISI, GB .material : carbon steel , stainless steel , alloy steel .class: class4 . class 8, ... and exporter for different kinds of fasteners ,pipe fittings and metal parts . We can ... fasteners of many sizes and standards, GB, JB, ISO, DIN, ANSI (IFI), BS, JIS, etc.The material could be brass , aluminum , carbon steel ...