Carpenter 20Cb3 heavy stud bolt ASME B18.2.1 A193 B7 stud bolt alloy bolt
A193 B7 Cadmium Plated stud bolts are made of alloy steel for high temperature environments. ASTM standards cover alloy steel and stainless steel bolting materials; this specification covers fasteners for pressure vessels, valves, flanges, and fittings.
Inch series fasteners that meet ASTM A193 Grade B7 specifications are typically used for flange bolting applications. ASTM A193 covers the requirements for high temperature and high pressure bolted joints. Heavy-duty hex head bolts have larger heads to increase the bearing surface and distribute the clamping load over a larger area. The material has a minimum tensile strength of 100 ksi and a yield strength of 75 ksi. The ASTM A193 specification covers various requirements for grade B7, including chemical composition, hardness, and more. ASTM A193 B7 fasteners are galvanized or hot-dip galvanized to enhance their corrosion resistance.