666.5 HRC = 6,798.3 HV
| HRC | HV |
|---|---|
| 651.5 HRC | 6,645.3 |
| 656.5 HRC | 6,696.3 |
| 661.5 HRC | 6,747.3 |
| 666.5 | 6,798.3 |
| 671.5 HRC | 6,849.3 |
| 676.5 HRC | 6,900.3 |
| 681.5 HRC | 6,951.3 |
666.5 HRC = 6,798.3 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