Brinell and Rockwell Hardness Conversion Table Chart

These Conversion Tables presents data in the Rockwell A, B, C, D, E and F hardness range on the relationship among Brinell hardness, Vickers hardness, Rockwell superficial, hardness, and Shore Scleroscope hardness of nonaustenitic steels including carbon, alloy, and tool steels in the as-forged, annealed, normalized, and quenched and tempered conditions provided that they are homogeneous.

For plain carbon steels, the approximate relationship between the hardness and tensile strength is:
Tensile strength = Bhn × 515 (for Brinell numbers up to 175)
Tensile strength = Bhn × 490 (for Brinell numbers larger than 175)

The above formulas give the tensile strength in pounds per square inch for steels. These approximate relationships between hardness and tensile strength do not apply to nonferrous metals, with the possible exception of certain aluminum alloys.

Related:

Brinell Hardness Testing Equation

Table A
Brinell Hardness to Rockwell Hardness Conversion Table

 Brinell Hardness Rockwell Hardness Tensile Strength (Approximate) Psi Tungsten Carbide Ball 3000 KG A Scale 60KG B Scale 100KG C Scale 150KG - 85.6 - 68.0 - - 85.3 - 67.5 - - 85.0 - 67.0 - 767 84.7 - 66.4 - 757 84.4 - 65.9 - 745 84.1 - 65.3 - 733 83.8 - 64.7 - 722 83.4 - 64.0 - 712 - - - - 710 83.0 - 63.3 - 698 82.6 - 62.5 - 684 82.2 - 61.8 - 682 82.2 - 61.7 - 670 81.8 - 61.0 - 656 81.3 - 60.1 - 653 81.2 - 60.0 - 647 81.1 - 59.7 - 638 80.8 - 59.2 329,000 630 80.6 - 58.8 324,000 627 80.5 - 58.7 323,000 601 79.8 - 57.3 309,000 578 79.1 - 56.0 297,000 555 78.4 - 54.7 285,000 534 77.8 - 53.5 274,000 514 76.9 - 52.1 263,000 495 76.3 - 51.0 253,000 477 75.6 - 49.6 243,000 461 74.9 - 48.5 235,000 444 74.2 - 47.1 225,000 429 73.4 - 45.7 217,000 415 72.8 - 44.5 210,000 401 72.0 - 43.1 202,000 388 71.4 - 41.8 195,000 375 70.6 - 40.4 188,000 363 70.0 - 39.1 182,000 352 69.3 - 37.9 176,000 341 68.7 - 36.6 170,000 331 68.1 - 35.5 166,000 321 67.5 - 34.3 160,000 311 66.9 - 33.1 155,000 302 66.3 - 32.1 150,000 293 65.7 - 30.9 145,000 285 65.3 - 29.9 141,000 277 64.6 - 28.8 137,000 269 64.1 - 27.6 133,000 262 63.6 - 26.6 129,000 255 63.0 - 25.4 126,000 248 62.5 - 24.2 122,000 241 61.8 100.0 22.8 118,000 235 61.4 99.0 21.7 115,000 229 60.8 98.2 20.5 111,000 223 - 97.3 20.0 - 217 - 96.4 18.0 105,000 212 - 95.5 17.0 102,000 207 - 94.6 16.0 100,000 201 - 93.8 15.0 98,000 197 - 92.8 - 95,000 192 - 91.9 - 93,000 187 - 90.7 - 90,000 183 - 90.0 - 89,000 179 - 89.0 - 87,000 174 - 87.8 - 85,000 170 - 86.8 - 83,000 167 - 86.0 - 81,000 163 - 85.0 - 79,000 156 - 82.9 - 76,000 149 - 80.8 - 73,000 143 - 78.7 - 71,000 137 - 76.4 - 67,000 131 - 74.0 - 65,000 126 - 72.0 - 63,000 121 - 69.8 - 60,000 116 - 67.6 - 58,000 111 - 65.7 - 56,000

Table B
Rockwell - Rockwell Superficial - Brinell - Vickers - Shore Hardness Conversion

 Rockwell Rockwell Superficial Brinell Vickers Shore Hardness A B C D E F 15-N 30-N 45-N 30-T 3000 kg 500 kg 136 60kg Brale 100kg 1/16" Ball 150kg Brale 100kg Brale 100kg 1/8" Ball 60kg 1/16" Ball 15kg Brale 30kg Brale 45kg Brale 30 kg 1/16" Ball 10mm Ball Steel 10mm Ball Steel Diamond Pyramid Sciero-scope 86.5 --- 70 78.5 --- --- 94.0 86.0 77.6 --- --- --- 1076 101 86.0 --- 69 77.7 --- --- 93.5 85.0 76.5 --- --- --- 1044 99 85.6 --- 68 76.9 --- --- 93.2 84.4 75.4 --- --- --- 940 97 85.0 --- 67 76.1 --- --- 92.9 83.6 74.2 --- --- --- 900 95 84.5 --- 66 75.4 --- --- 92.5 82.8 73.2 --- --- --- 865 92 83.9 --- 65 74.5 --- --- 92.2 81.9 72.0 --- 739 --- 832 91 83.4 --- 64 73.8 --- --- 91.8 81.1 71.0 --- 722 --- 800 88 82.8 --- 63 73.0 --- --- 91.4 80.1 69.9 --- 705 --- 772 87 82.3 --- 62 72.2 --- --- 91.1 79.3 68.8 --- 688 --- 746 85 81.8 --- 61 71.5 --- --- 90.7 78.4 67.7 --- 670 --- 720 83 81.2 --- 60 70.7 --- --- 90.2 77.5 66.6 --- 654 --- 697 81 80.7 --- 59 69.9 --- --- 89.8 76.6 65.5 --- 634 --- 674 80 80.1 --- 58 69.2 --- --- 89.3 75.7 64.3 --- 615 --- 653 78 79.6 --- 57 68.5 --- --- 88.9 74.8 63.2 --- 595 --- 633 76 79.0 --- 56 67.7 --- --- 88.3 73.9 62.0 --- 577 --- 613 75 78.5 120 55 66.9 --- --- 87.9 73.0 60.9 --- 560 --- 595 74 78.0 120 54 66.1 --- --- 87.4 72.0 59.8 --- 543 --- 577 72 77.4 119 53 65.4 --- --- 86.9 71.2 58.6 --- 525 --- 560 71 76.8 119 52 64.6 --- --- 86.4 70.2 57.4 --- 500 --- 544 69 76.3 118 51 63.8 --- --- 85.9 69.4 56.1 --- 487 --- 528 68 75.9 117 50 63.1 --- --- 85.5 68.5 55.0 --- 475 --- 513 67 75.2 117 49 62.1 --- --- 85.0 67.6 53.8 --- 464 --- 498 66 74.7 116 48 61.4 --- --- 84.5 66.7 52.5 --- 451 --- 484 64 74.1 116 47 60.8 --- --- 83.9 65.8 51.4 --- 442 --- 471 63 73.6 115 46 60.0 --- --- 83.5 64.8 50.3 --- 432 --- 458 62 73.1 115 45 59.2 --- --- 83.0 64.0 49.0 --- 421 --- 446 60 72.5 114 44 58.5 --- --- 82.5 63.1 47.8 --- 409 --- 434 58 72.0 113 43 57.7 --- --- 82.0 62.2 46.7 --- 400 --- 423 57 71.5 113 42 56.9 --- --- 81.5 61.3 45.5 --- 390 --- 412 56 70.9 112 41 56.2 --- --- 80.9 60.4 44.3 --- 381 --- 402 55 70.4 112 40 55.4 --- --- 80.4 59.5 43.1 --- 371 --- 392 54 69.9 111 39 54.6 --- --- 79.9 58.6 41.9 --- 362 --- 382 52 69.4 110 38 53.8 --- --- 79.4 57.7 40.8 --- 353 --- 372 51 68.9 110 37 53.1 --- --- 78.8 56.8 39.6 --- 344 --- 363 50 68.4 109 36 52.3 --- --- 78.3 55.9 38.4 --- 336 --- 354 49 67.9 109 35 51.5 --- --- 77.7 55.0 37.2 --- 327 --- 345 48 67.4 108 34 50.8 --- --- 77.2 54.2 36.1 --- 319 --- 336 47 66.8 108 33 50.0 --- --- 76.6 53.3 34.9 --- 311 --- 327 46 66.3 107 32 49.2 --- --- 76.1 52.1 33.7 --- 301 --- 318 44 65.8 106 31 48.4 --- --- 75.6 51.3 32.5 --- 294 --- 310 43 65.3 105 30 47.7 --- --- 75.0 50.4 31.3 --- 286 --- 302 42 64.7 104 29 47.0 --- --- 74.5 49.5 30.1 --- 279 --- 294 41 64.3 104 28 46.1 --- --- 73.9 48.6 28.9 --- 271 --- 286 41 63.8 103 27 45.2 --- --- 73.3 47.7 27.8 --- 264 --- 279 40 63.3 103 26 44.6 --- --- 72.8 46.8 26.7 --- 258 --- 272 39 62.8 102 25 43.8 --- --- 72.2 45.9 25.5 --- 253 --- 266 38 62.4 101 24 43.1 --- --- 71.6 45.0 24.3 --- 247 --- 260 37 62.0 100 23 42.1 --- --- 71.0 44.0 23.1 82.0 240 201 254 36 61.5 99 22 41.6 --- --- 70.5 43.2 22.0 81.5 234 195 248 35 61.0 98 21 40.9 --- --- 69.9 42.3 20.7 81.0 228 189 243 35 60.5 97 20 40.1 --- --- 69.4 41.5 19.6 80.5 222 184 238 34 59.0 96 18 --- --- --- --- --- --- 80.0 216 179 230 33 58.0 95 16 --- --- --- --- --- --- 79.0 210 175 222 32 57.5 94 15 --- --- --- --- --- --- 78.5 205 171 213 31 57.0 93 13 --- --- --- --- --- --- 78.0 200 167 208 30 56.5 92 12 --- --- --- --- --- --- 77.5 195 163 204 29 56.0 91 10 --- --- --- --- --- --- 77.0 190 160 196 28 55.5 90 9 --- --- --- --- --- --- 76.0 185 157 192 27 55.0 89 8 --- --- --- --- --- --- 75.5 180 154 188 26 54.0 88 7 --- --- --- --- --- --- 75.0 176 151 184 26 53.5 87 6 --- --- --- --- --- --- 74.5 172 148 180 26 53.0 86 5 --- --- --- --- --- --- 74.0 169 145 176 25 52.5 85 4 --- --- --- --- --- --- 73.5 165 142 173 25 52.0 84 3 --- --- --- --- --- --- 73.0 162 140 170 25 51.0 83 2 --- --- --- --- --- --- 72.0 159 137 166 24 50.5 82 1 --- --- --- --- --- --- 71.5 156 135 163 24 50.0 81 0 --- --- --- --- --- --- 71.0 153 133 160 24 49.5 80 --- --- --- --- --- --- --- 70.0 150 130 --- --- 49.0 79 --- --- --- --- --- --- --- 69.5 147 128 --- --- 48.5 78 --- --- --- --- --- --- --- 69.0 144 126 --- --- 48.0 77 --- --- --- --- --- --- --- 68.0 141 124 --- --- 47.0 76 --- --- --- --- --- --- --- 67.5 139 122 --- --- 46.5 75 --- --- --- 99.5 --- --- --- 67.0 137 120 --- --- 46.0 74 --- --- --- 99.0 --- --- --- 66.0 135 118 --- --- 45.5 73 --- --- --- 98.5 --- --- --- 65.5 132 116 --- --- 45.0 72 --- --- --- 98.0 --- --- --- 65.0 130 114 --- --- 44.5 71 --- --- 100.0 97.5 --- --- --- 64.2 127 112 --- --- 44.0 70 --- --- 99.5 97.0 --- --- --- 63.5 125 110 --- --- 43.5 69 --- --- 99.0 96.0 --- --- --- 62.8 123 109 --- --- 43.0 68 --- --- 98.0 95.5 --- --- --- 62.0 121 107 --- --- 42.5 67 --- --- 97.5 95.0 --- --- --- 61.4 119 106 --- --- 42.0 66 --- --- 97.0 94.5 --- --- --- 60.5 117 104 --- --- 41.8 65 --- --- 96.0 94.0 --- --- --- 60.1 116 102 --- --- 41.5 64 --- --- 95.5 93.5 --- --- --- 59.5 114 101 --- --- 41.0 63 --- --- 95.0 93.0 --- --- --- 58.7 112 99 --- --- 40.5 62 --- --- 94.5 92.0 --- --- --- 58.0 110 98 --- --- 40.0 61 --- --- 93.5 91.5 --- --- --- 57.3 108 96 --- --- 39.5 60 --- --- 93.0 91.0 --- --- --- 56.5 107 95 --- --- 39.0 59 --- --- 92.5 90.5 --- --- --- 55.9 106 94 --- --- 38.5 58 --- --- 92.0 90.0 --- --- --- 55.0 104 92 --- --- 38.0 57 --- --- 91.0 89.5 --- --- --- 54.6 102 91 --- --- 37.8 56 --- --- 90.5 89.0 --- --- --- 54.0 101 90 --- --- 37.5 55 --- --- 90.0 88.0 --- --- --- 53.2 99 89 --- --- 37.0 54 --- --- 89.5 87.5 --- --- --- 52.5 --- 87 --- --- 36.5 53 --- --- 89.0 87.0 --- --- --- 51.8 --- 86 --- --- 36.0 52 --- --- 88.0 86.5 --- --- --- 51.0 --- 85 --- --- 35.5 51 --- --- 87.5 86.0 --- --- --- 50.4 --- 84 --- --- 35.0 50 --- --- 87.0 85.5 --- --- --- 49.5 --- 83 --- --- 34.8 49 --- --- 86.5 85.0 --- --- --- 49.1 --- 82 --- --- 34.5 48 --- --- 85.5 84.5 --- --- --- 48.5 --- 81 --- --- 34.0 47 --- --- 85.0 84.0 --- --- --- 47.7 --- 80 --- --- 33.5 46 --- --- 84.5 83.0 --- --- --- 47.0 --- 79 --- --- 33.0 45 --- --- 84.0 82.5 --- --- --- 46.2 --- 79 --- --- 32.5 44 --- --- 83.5 82.0 --- --- --- 45.5 --- 78 --- --- 32.0 43 --- --- 82.5 81.5 --- --- --- 44.8 --- 77 --- --- 31.5 42 --- --- 82.0 81.0 --- --- --- 44.0 --- 76 --- --- 31.0 41 --- --- 81.5 80.5 --- --- --- 43.4 --- 75 --- --- 30.8 40 --- --- 81.0 79.5 --- --- --- 43.0 --- 74 --- --- 30.5 39 --- --- 80.0 79.0 --- --- --- 42.1 --- 74 --- --- 30.0 38 --- --- 79.5 78.5 --- --- --- 41.5 --- 73 --- --- 29.5 37 --- --- 79.0 78.0 --- --- --- 40.7 --- 72 --- --- 29.0 36 --- --- 78.5 77.5 --- --- --- 40.0 --- 71 --- --- 28.5 35 --- --- 78.0 77.0 --- --- --- 39.3 --- 71 --- --- 28.0 34 --- --- 77.0 76.5 --- --- --- 38.5 --- 70 --- --- 27.8 33 --- --- 76.5 75.5 --- --- --- 37.9 --- 69 --- --- 27.5 32 --- --- 76.0 75.0 --- --- --- 37.5 --- 68 --- --- 27.0 31 --- --- 75.5 74.5 --- --- --- 36.6 --- 68 --- --- 26.5 30 --- --- 75.0 74.0 --- --- --- 36.0 --- 67 --- --- 26.0 29 --- --- 74.0 73.5 --- --- --- 35.2 --- 66 --- --- 25.5 28 --- --- 73.5 73.0 --- --- --- 34.5 --- 66 --- --- 25.0 27 --- --- 73.0 72.5 --- --- --- 33.8 --- 65 --- --- 24.5 26 --- --- 72.5 72.0 --- --- --- 33.1 --- 65 --- --- 24.2 25 --- --- 72.0 71.0 --- --- --- 32.4 --- 64 --- --- 24.0 24 --- --- 71.0 70.5 --- --- --- 32.0 --- 64 --- --- 23.5 23 --- --- 70.5 70.0 --- --- --- 31.1 --- 63 --- --- 23.0 22 --- --- 70.0 69.5 --- --- --- 30.4 --- 63 --- --- 22.5 21 --- --- 69.5 69.0 --- --- --- 29.7 --- 62 --- --- 22.0 20 --- --- 68.5 68.5 --- --- --- 29.0 --- 62 --- --- 21.5 19 --- --- 68.0 68.0 --- --- --- 28.1 --- 61 --- --- 21.2 18 --- --- 67.5 67.0 --- --- --- 27.4 --- 61 --- --- 21.0 17 --- --- 67.0 66.5 --- --- --- 26.7 --- 60 --- --- 20.5 16 --- --- 66.5 66.0 --- --- --- 26.0 --- 60 --- --- 20.0 15 --- --- 65.5 65.5 --- --- --- 25.3 --- 59 --- --- --- 14 --- --- 65.0 65.0 --- --- --- 24.6 --- 59 --- --- --- 13 --- --- 64.5 64.5 --- --- --- 23.9 --- 58 --- --- --- 12 --- --- 64.0 64.0 --- --- --- 23.5 --- 58 --- --- --- 11 --- --- 63.5 63.5 --- --- --- 22.6 --- 57 --- --- --- 10 --- --- 62.5 63.0 --- --- --- 21.9 --- 57 --- --- --- 9 --- --- 62.0 62.0 --- --- --- 21.2 --- 56 --- --- --- 8 --- --- 61.5 61.5 --- --- --- 20.5 --- 56 --- --- --- 7 --- --- 61.0 61.0 --- --- --- 19.8 --- 56 --- --- --- 6 --- --- 60.5 60.5 --- --- --- 19.1 --- 55 --- --- --- 5 --- --- 60.0 60.0 --- --- --- 18.4 --- 55 --- --- --- 4 --- --- 59.0 59.5 --- --- --- 18.0 --- 55 --- --- --- 3 --- --- 58.5 59.0 --- --- --- 17.1 --- 54 --- --- --- 2 --- --- 58.0 58.0 --- --- --- 16.4 --- 54 --- --- --- 1 --- --- 57.5 57.5 --- --- --- 15.7 --- 53 --- --- --- 0 --- --- 57.0 57.0 --- --- --- 15.0 --- 53 --- ---