2HMatching nuts
ASTM A194 Grade 2H
The nut that goes on B7. Quenched-and-tempered carbon steel at 24–38 HRC, always heavy hex, always thicker than a standard nut so the threads yield before the stud breaks.
- Base material
- Medium carbon steel
- Heat treatment condition
- Quenched and tempered
- Hardness, max
- 24 HRC minimum, 38 HRC maximum (248–352 HBW)
Service temperature
-48 °C+427 °C−273+900 °C
Standard mate for A193 B7 and B16. Do not use on B7M or L7M — its hardness is far above the 22 HRC that sour service allows.
Chemical composition
| Element | Min (% by weight) | Max (% by weight) |
|---|---|---|
| C | 0.40 | — |
| Mn | 0.40 | — |
| P | — | 0.048 |
| S | — | 0.058 |
| Si | 0.10 | — |
Mechanical properties
ASTM A194 does not set a separate tensile requirement for nuts. The grade is controlled by hardness and by a proof load test, which is why the strength columns below read as dashes.
| Diameter | Tensile strength, min | Yield strength, min | Elongation, min | Hardness, max |
|---|---|---|---|---|
| ≤ 1½ in (≤ M36) | — | — | — | 24–38 HRC · 248–352 HBW |
| > 1½ in (> M36) | — | — | — | 24–38 HRC · 248–352 HBW |
Recommended coatings
Equivalent grades
- ASME SA194 2H
- Heavy hex nut ASME B18.2.2
- DIN 934 (khong tuong duong ve chieu day)
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