Specification: M24-M30

Material: Q235, 45#, 40Cr, 35 Crmo, 42 Crmo

Grade: 4.8, 6.8, 8.8, 10.9, 12.9

Surface Treatment: Black Oxide, Zinc plated, HDG, Galvanized, Plain (Oiled), Dacromet.

Application: Railway, Subway, Metro;