640.5 HRB = 1,152.9 HV
| HRB | HV |
|---|---|
| 625.5 HRB | 1,125.9 |
| 630.5 HRB | 1,134.9 |
| 635.5 HRB | 1,143.9 |
| 640.5 HRB | 1,152.9 |
| 645.5 HRB | 1,161.9 |
| 650.5 HRB | 1,170.9 |
| 655.5 HRB | 1,179.9 |
640.5 HRB = 1,152.9 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