B8M Stud are stainless steel studs that are commonly used in pipe flange connections. Each stud comes with two 2H heavy hex nuts and are sold as a set. ASTM A193 & A194 Grade B8M bolts are made from a more corrosion-resistant type 316 stainless steel. Thread = 8 TPI for diameters larger than 1" A Certificate can be requested at the time of ordering.