Standard: DIN, GB, ASME, ANSI, Non-standard Material: Spring steel,Carbon steel, Stainless steel,brass,copper eatures:1)Standard: DIN137,GB860,ANSI/ASTM,BS,JIS,Non-standard2)Material: Spring steel 65Mn,Carbon steel, stainless steel(A2,A4),brass,copper3)Metric size: from M3 to M304) Surface finish:Plain,Zinc-plated, Nickel, Phosphate black,HDG,dacromet etc5) Packing: Standard export packing, also ...