1)Stud 2)Material: Carbon steel, B7, 42CrMo 3)Surface: Plain, Black, ... 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.. 1 ... made according to the buyer's requirements.3) Material: Carbon steel, B7, 42CrMo, etc4) Standard: DIN, ANSI, BS, ...