studs 1.Size:M16-72 2.Grade:10.9,8.8 3.Standard: GB898,GB899,GB900,GB901 4. Surface treatment: customised We have nearly 40 years experience in producing high strength fasteners, our products be widely used in Wind Power field, Steam Turbine, High-speed Train, Petroleum and Petrochemical field, etc.. hexagon bolt/high strength bolt1) Description: hexagon bolt/screw, hex bolt/screw, high strength ...