306.5 Mohs = 3 HRC
| Mohs | HRC |
|---|---|
| 291.5 Mohs | 2.86 |
| 296.5 Mohs | 2.91 |
| 301.5 Mohs | 2.96 |
| 306.5 | 3 |
| 311.5 Mohs | 3.05 |
| 316.5 Mohs | 3.1 |
| 321.5 Mohs | 3.15 |
306.5 Mohs = 3 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