... nut ,hex nut , flange nut , nylon insert nut , slotted nut , round nut ,wing nut , eye nut ,lock nut and other special nut Materials: carbon steel, alloy steel, stainless steel, brass and ... so on Surface treatment: plain, passivate, black, ZP, YP and ... ANSI, BS, JIS and nonstandard (according to customer ...