139.5 Mohs = 1.37 HRC
| Mohs | HRC |
|---|---|
| 124.5 Mohs | 1.22 |
| 129.5 Mohs | 1.27 |
| 134.5 Mohs | 1.32 |
| 139.5 | 1.37 |
| 144.5 Mohs | 1.42 |
| 149.5 Mohs | 1.47 |
| 154.5 Mohs | 1.51 |
139.5 Mohs = 1.37 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