Engineering Tools
Reference data for specifying and sourcing fasteners correctly — the numbers a procurement or design engineer actually needs.
Hardness scale conversion
Approximate conversion between Rockwell C, Rockwell B, Brinell and Vickers — useful when a mill certificate reports a different scale than your spec.
| HRC | HRB | HB (Brinell) | HV (Vickers) |
|---|---|---|---|
| 20 | 95 | 226 | 238 |
| 25 | 100 | 253 | 266 |
| 30 | — | 286 | 302 |
| 32 | — | 301 | 318 |
| 35 | — | 327 | 345 |
| 39 | — | 363 | 384 |
| 42 | — | 391 | 415 |
| 45 | — | 421 | 449 |