ASTM A193 Grade B8 Bolts, Stud Bolts, Fasteners
ASTM A193 Grade B8 Bolting. ASTM A193 Grade B8 is a material specification for high tensile stainless steel bolts, stud bolts, screws, threaded rods and similar bolting parts, for high temperature, high pressure applications. ASTM A193 B8 is 18-8 chromium-nickel alloy, equivalent to SS 304 and UNS S30400 with tensile strength of 75 ksi.