171.5 Mohs = 1.68 HRC
| Mohs | HRC |
|---|---|
| 156.5 Mohs | 1.53 |
| 161.5 Mohs | 1.58 |
| 166.5 Mohs | 1.63 |
| 171.5 | 1.68 |
| 176.5 Mohs | 1.73 |
| 181.5 Mohs | 1.78 |
| 186.5 Mohs | 1.83 |
171.5 Mohs = 1.68 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