278.5 Mohs = 2.73 HRC
| Mohs | HRC |
|---|---|
| 263.5 Mohs | 2.58 |
| 268.5 Mohs | 2.63 |
| 273.5 Mohs | 2.68 |
| 278.5 | 2.73 |
| 283.5 Mohs | 2.78 |
| 288.5 Mohs | 2.83 |
| 293.5 Mohs | 2.88 |
278.5 Mohs = 2.73 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