high tensile nut bolts: 1. Spec.: DIN,JIS, ... 9,12.9 4. Material: Q235,45#,40Cr ASTM DIN GB Rail high tensile nut bolts with large ... hexagon head for steel structures I. Item:High strength bolts ... , bridge, boiler with steel structure, industry workshop, high civil buildings, hoisting machinery and so on.IV. ... DIN GB Metric rail hex head high tensile nut bolts