Drawings and customer specifications will often quote hardness ranges for the steel required. Dependant upon the source, these can appear according to a variety of scales. The chart below gives approximate conversions between different scales. This should be a guide only as the tests use a variety of methods to ascertain values.
| Brinell Hardness | Vickers Hardness | Rockwell Hardness | Rockwell Hardness | Equiv Rm | Equiv Rm |
| HB | HV | B | C | kgf/mm² | N/mm² |
| 601 | 640 | – | 57 | – | 2123 |
| 578 | 615 | – | 56 | – | 2057 |
| 555 | 591 | 120 | 54.5 | – | 1948 |
| 534 | 569 | 119 | 53.5 | 1876 | |
| 514 | 547 | 119 | 52 | 170 | 1801 |
| 495 | 528 | 117 | 51 | 165 | 1736 |
| 477 | 508 | 117 | 49.5 | 160 | 1647 |
| 461 | 491 | 116 | 48.5 | 158 | 1569 |
| 444 | 474 | 115 | 47 | 155 | 1520 |
| 429 | 455 | 115 | 45.5 | 150 | 1471 |
| 415 | 440 | 114 | 44.5 | 145 | 1422 |
| 401 | 425 | 113 | 43 | 139 | 1363 |
| 388 | 410 | 112 | 42 | 134 | 1314 |
| 375 | 396 | 112 | 40.5 | 129 | 1265 |
| 363 | 383 | 110 | 39 | 126 | 1236 |
| 352 | 372 | 110 | 38 | 121 | 1187 |
| 341 | 360 | 109 | 36.5 | 118 | 1157 |
| 331 | 350 | 109 | 35.5 | 114 | 1118 |
| 321 | 339 | 108 | 34.5 | 111 | 1089 |
| 311 | 328 | 108 | 33 | 107 | 1049 |
| 302 | 319 | 107 | 32 | 104 | 1020 |
| 293 | 309 | 106 | 31 | 101 | 990 |
| 285 | 301 | 105 | 30 | 99 | 971 |
| 277 | 292 | 104 | 29 | 96 | 941 |
| 269 | 284 | 104 | 27.5 | 93 | 912 |
| 262 | 276 | 103 | 26.5 | 91 | 892 |
