1)nut and bolt 2>Grade: Q235,202,304,316L ... *25mm NIut and bolt:Specifications:Material:35# 45# steel.40Cr.35Crmo. Finish:Black or zinc plated or HDG ... DIN, GB, JIS, ANSI, Non-standard 2) Material: Carbon steel, stainless steel ,aolly steel3) Coating: plain, zinc, nickel, black .4) ... bolt (DIN444) and so on. NUT:(M12-45), include spring nut, hex nut(DIN934), cap nut(DIN1587), hex flange nuts(DIN6923), hex ...