Classes of ASTM A193 Grade B8 Stud Bolts

ASTM A193 specification covers alloy steel and stainless steel bolting material for pressure vessels, fittings, flanges, and valves for high temperature or high pressure service, or other special purpose applications. Several grades are covered, including ferritic steels and austenitic stainless steels designated B5, B7, B8, and so forth.

Selection will depend upon design, mechanical properties, service conditions and high temperature characteristics. Material according to ASTM A193 B8 is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch for diameters above one inch.

ASTM A193 Grade B8 is a standard material specification for use in high tensile, for corrosion resistant austenitic stainless steel fasteners, high temperature and special purpose applications such as pressure vessels bolting and pressure piping. Grade B8 is a heat-treated, work-hardened austenitic stainless steel further divided into class 1, class 2 & class 2B, each having a distinguished tensile strength. ASTM A193 specification covers requirements for heat-treatment, mechanical properties, chemical composition, hardness, and recommended nuts-washers for Grade B8 Fasteners.

Fasteners are made of 304 austenitic stainless steel material. B8 Class 2 stud and other fasteners have a minimum tensile strength ranging from 70ksi to 120ksi depending on different sizes. Smaller sizes usually have high strength. The ASTM A193 B8 class 2 torque chart provides the different strengths and capacities of different sizes, shapes and types of different fasteners in this grade. There are different types such as washers, threaded rods, screws and others. ASTM A193 B8 has good general corrosion resistance.

The material is also one of the most used due to the low cost of the material. It is the most used due to its balanced strength, ductility and corrosion resistance. ASTM A193 B8 Class 2 fasteners can be seen in domestic, commercial and industrial applications such as petroleum, power plants, water supply, chemicals, heat exchangers and many other applications. Feel free to contact Regal Sales Corporation for more information about the different types such as A193 B8 stud bolts and others.