ASTM A193 is a widely used specification in the petroleum and chemical construction industries, outlining the mechanical properties for alloy-steel and stainless steel bolting materials intended for high-temperature or high-pressure service, as well as other special applications. This standard covers fasteners used in crucial components like pressure vessels, valves, flanges, and fittings. While these materials are often available with Unified National Coarse (UNC) thread pitches, traditional high-pressure applications often specify a thread density of 8 threads per inch (tpi) for fastener diameters exceeding one inch.
ASTM A193 Grades
| B7 |  |
Hex bolts, screws, stud bolts, double ended studs, full thread rods, full threaded studs |
| B7M |  |
Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines |
| B16 |  |
Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines |
| B8 |  |
Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines |
| B8M |  |
Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines |
| B8T |  |
Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines |
