B8M Stud are stainless steel studs that are commonly used in pipe flange connections.  Each stud comes with two G8M heavy hex nuts and are sold as a set.  ASTM A193 & A194   Grade B8M Studs are made from a more corrosion-resistant type 316 stainless steel.  A Certificate can be requested at the time of ordering.
Thread = 13 TPI