409.5 Mohs = 4.01 HRC
| Mohs | HRC |
|---|---|
| 394.5 Mohs | 3.87 |
| 399.5 Mohs | 3.92 |
| 404.5 Mohs | 3.97 |
| 409.5 | 4.01 |
| 414.5 Mohs | 4.06 |
| 419.5 Mohs | 4.11 |
| 424.5 Mohs | 4.16 |
409.5 Mohs = 4.01 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