221.5 Mohs = 2.17 HRC
| Mohs | HRC |
|---|---|
| 206.5 Mohs | 2.02 |
| 211.5 Mohs | 2.07 |
| 216.5 Mohs | 2.12 |
| 221.5 | 2.17 |
| 226.5 Mohs | 2.22 |
| 231.5 Mohs | 2.27 |
| 236.5 Mohs | 2.32 |
221.5 Mohs = 2.17 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