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There are a large number of hardness testing methods available (eg. Vickers, Brinell and Rockwell). Although it is impossible in many cases to give an exact conversion it is possible to give a comparison table.
Hardness Comparison Table
Brinell Vickers Rockwell C Rockwell B 800 - 72 - 780 1220 71 - 760 1170 70 - 745 1114 68 - 725 1060 67 - 712 1021 66 - 682 940 65 - 668 905 64 - 652 867 63 - 626 803 62 - 614 775 61 - 601 746 60 - 590 727 59 - 576 694 57 - 552 649 56 - 545 639 55 - 529 606 54 - 514 587 53 120 502 565 52 119 495 551 51 119 477 534 49 118 461 502 48 117 451 489 47 117 444 474 46 116 427 460 45 115 415 435 44 115 401 423 43 114 388 401 42 114 375 390 41 113 370 385 40 112 362 380 39 111 351 361 38 111 346 352 37 110 341 344 37 110 331 335 36 109 323 320 35 109 311 312 34 108 301 305 33 107 293 291 32 106 285 285 31 105 276 278 30 105 269 272 29 104 261 261 28 103 258 258 27 102 249 250 25 101 245 246 24 100 240 240 23 99 237 235 23 99 229 226 22 98 224 221 21 97 217 217 20 96 211 213 19 95 206 209 18 94 203 201 17 94 200 199 16 93 196 197 15 92 191 190 14 92 187 186 13 91 185 184 12 91 183 183 11 90 180 177 10 89 175 174 9 88 170 191 7 87 167 168 6 87 165 165 5 86 163 162 4 85 160 159 3 84 156 154 2 83 154 152 1 82 152 150 - 82 150 149 - 81 147 147 - 80 145 146 - 79 143 144 - 79 141 142 - 78 140 141 - 77 135 135 - 75 130 130 - 72 114 120 - 67 105 110 - 62 95 100 - 56 90 95 - 52 81 85 - 41 76 80 - 37 See also
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