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ASTM A193
The ASTM A193 specification covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. 8 threads per inch (tpi) is common for diameters above one inch.
Strengths
| Grade | Tensile (ksi) | Yield (ksi) |
|---|
| B7 | 100 - 125 | 75 - 105 |
| B8 | 75 | 30 |
| B8 Class 2 | 100 - 125 | 50 - 100 |
| B8M | 75 | 30 |
| B8M Class 2 | 90 - 110 | 50 - 95 |
*Class 2 denotes a strain hardening process applied
Matching Hardware
| Grade |
Material |
Matching Nut |
Matching Washer |
| B7 |
Alloy Steel |
A194 2H |
F436 |
| B8 |
304 Stainless Steel |
A194 GR8 |
304 Stainless Steel |
| B8 Class 2 |
304 S/S Strain Hardened |
A194 GR8 Class 2 |
304 Stainless Steel |
| B8M |
316 Stainless Steel |
A194 GR8M |
316 Stainless Steel |
| B8M Class 2 |
316 S/S Strain Hardened |
A194 GR8M Class 2 |
316 Stainless Steel |
