Heavy hex nuts
ASTM A194 8M — chemistry & properties
ASTM A194 8M (Heavy hex nuts, UNS S31600): chemical composition and mechanical properties. Nuts for A193 B8M studs
Chemical composition (wt %)
| C | ≤ 0.08 |
| Mn | ≤ 2 |
| P | ≤ 0.045 |
| S | ≤ 0.03 |
| Si | ≤ 1 |
| Cr | 16 – 18 |
| Ni | 10 – 14 |
| Mo | 2 – 3 |
Mechanical properties
| Hardness | 126–300 HBW |