... ,45#,40Cr ASTM DIN GB Rail high tensile nut bolts with large hexagon head for steel structures I. Item:High strength ... /T 1230 III. Usage:Supply to railway, highway, bridge, boiler with steel structure, industry workshop, high civil buildings, hoisting machinery and ... view Testing equipments Workshop Welcome your visit! ASTM DIN GB Metric rail hex head high tensile nut bolts