178.5 Mohs = 1.75 HRC
| Mohs | HRC |
|---|---|
| 163.5 Mohs | 1.6 |
| 168.5 Mohs | 1.65 |
| 173.5 Mohs | 1.7 |
| 178.5 | 1.75 |
| 183.5 Mohs | 1.8 |
| 188.5 Mohs | 1.85 |
| 193.5 Mohs | 1.9 |
178.5 Mohs = 1.75 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