251.5 Mohs = 2.47 HRC
| Mohs | HRC |
|---|---|
| 236.5 Mohs | 2.32 |
| 241.5 Mohs | 2.37 |
| 246.5 Mohs | 2.42 |
| 251.5 | 2.47 |
| 256.5 Mohs | 2.51 |
| 261.5 Mohs | 2.56 |
| 266.5 Mohs | 2.61 |
251.5 Mohs = 2.47 HRC
1 HRC ≈ 10.2 HV · 1 HRB ≈ 1.8 HV · 1 Mohs ≈ 0.1 HV — approximate; real conversions vary by material per ASTM E140