Heavy hex nuts
ASTM A194 2HM — chemistry & properties
ASTM A194 2HM (Heavy hex nuts): chemical composition and mechanical properties. Sour-service nuts for A193 B7M studs
Chemical composition (wt %)
| C | ≥0.40 |
| Mn | ≤ 1 |
| P | ≤ 0.04 |
| S | ≤ 0.05 |
| Si | ≤ 0.4 |
Mechanical properties
| Hardness | 159–235 HBW (84–99 HRB) |