421.5 HRC = 4,299.3 HV
| HRC | HV |
|---|---|
| 406.5 HRC | 4,146.3 |
| 411.5 HRC | 4,197.3 |
| 416.5 HRC | 4,248.3 |
| 421.5 | 4,299.3 |
| 426.5 HRC | 4,350.3 |
| 431.5 HRC | 4,401.3 |
| 436.5 HRC | 4,452.3 |
421.5 HRC = 4,299.3 HV
1 HRC ≈ 10.2 HV · 1 HRB ≈ 1.8 HV · 1 Mohs ≈ 0.1 HV — approximate; real conversions vary by material per ASTM E140