309.5 Mohs = 3.03 HRC
| Mohs | HRC |
|---|---|
| 294.5 Mohs | 2.89 |
| 299.5 Mohs | 2.94 |
| 304.5 Mohs | 2.99 |
| 309.5 | 3.03 |
| 314.5 Mohs | 3.08 |
| 319.5 Mohs | 3.13 |
| 324.5 Mohs | 3.18 |
309.5 Mohs = 3.03 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