1,railway accessories 2,Standard: AREMA or ASTM, BS, UIC 3,Materials: Spring steel 4,Protection: Black, Zinc HDG 5,OEM railway accessoriesWhatever the standards, ASTM, DIN, BSW, GB, JIS, UIC, Russian or drawings from customers. Standard: AREMA or ASTM, BS, UICGrade: Normal and high strength.Materials: Spring steelProtection: Black, Zinc Plated, Hot dipped Galvanised.technics:punchingAll kinds are ...