428.5 Mohs = 4.2 HRC
| Mohs | HRC |
|---|---|
| 413.5 Mohs | 4.05 |
| 418.5 Mohs | 4.1 |
| 423.5 Mohs | 4.15 |
| 428.5 | 4.2 |
| 433.5 Mohs | 4.25 |
| 438.5 Mohs | 4.3 |
| 443.5 Mohs | 4.35 |
428.5 Mohs = 4.2 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