665.5 HRC = 6,788.1 HV
| HRC | HV |
|---|---|
| 650.5 HRC | 6,635.1 |
| 655.5 HRC | 6,686.1 |
| 660.5 HRC | 6,737.1 |
| 665.5 | 6,788.1 |
| 670.5 HRC | 6,839.1 |
| 675.5 HRC | 6,890.1 |
| 680.5 HRC | 6,941.1 |
665.5 HRC = 6,788.1 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