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Conversions All values, except WMN, are consistent with ASTM E140 Tables 1 and 2, and ASTM A370 Tables 3A and 3B, where applicable. WMN or Wilson Microcial Numbers were developed by Wilson Instruments in the Wilson Standards laboratory and are not derived from ASTM. Cylindrical Corrections Values are consistent with ASTM E18 Table 6,7,13, and 14 Hardness vs. Minimum Thickness Values are consistent with ASTM E18 Tables 4, 5, 11, and 12 except for D and G scale values, which are obtained from indentation hardness testing by Vincent E. Lysaght. Rockwell Supercial Knoop Brinell Tensile Strength Micro- cial B F G A E H K 15-T 30-T 45-T HK HB HB HV KSI WMN 100 kg 1/16” ball 60 kg 1/16” ball 150 kg 1/16” ball 60 kg Brale 100 kg 1/8” ball 60 kg 1/8” ball 150 kg 1/8” ball 15 kg 1/16” ball 30 kg 1/16” ball 45 kg 1/16” ball 500 gm and over 500 kg 10 mm ball 3000 kg 10 kg 1000 lbs/ sq in 1000 gm 100 99 98 82.5 81.0 79.0 61.5 60.9 60.2 93.1 92.8 92.5 83.1 82.5 81.8 72.9 71.9 70.9 251 246 241 201 195 189 240 234 228 116 114 109 730 725 719 97 96 95 77.5 76.0 74.0 59.5 58.9 58.3 92.1 91.8 91.5 81.1 80.4 79.8 69.9 68.9 67.9 236 231 226 184 179 175 222 216 210 104 102 100 713 707 701 94 93 92 72.5 71.0 69.0 57.6 57.0 56.4 NA 100 91.2 90.8 90.5 79.1 78.4 77.8 66.9 65.9 64.8 221 216 211 171 167 163 205 200 195 98 94 92 696 690 684 91 90 89 67.5 66.0 64.0 55.8 55.2 54.6 99.5 98.5 98.0 90.2 89.9 89.5 77.1 76.4 75.8 63.8 62.8 61.8 206 201 196 160 157 154 190 185 180 90 89 88 679 674 668 88 87 86 62.5 61.0 59.0 54.0 53.4 52.8 97.0 96.5 95.5 89.2 88.9 88.6 75.1 74.4 73.8 60.8 59.8 58.8 192 188 184 151 148 145 176 172 169 86 84 83 662 656 651 85 84 83 57.5 56.0 54.0 52.3 51.7 51.1 94.5 94.0 93.0 88.2 87.9 87.6 73.1 72.4 71.8 57.8 56.8 55.8 180 176 173 142 140 137 165 162 159 82 81 80 646 640 634 82 81 80 52.5 51.0 49.0 50.6 50.0 49.5 92.0 91.0 90.5 87.3 86.9 86.6 71.1 70.4 69.7 54.8 53.8 52.8 170 167 164 135 133 130 156 153 150 77 73 72 629 624 618 79 78 77 47.5 46.0 44.0 48.9 48.4 47.9 89.5 88.5 88.0 86.3 86.0 85.6 69.1 68.4 67.7 51.8 50.8 49.8 161 158 155 128 126 124 147 144 141 70 69 68 612 607 602 76 75 74 NA 99.6 99.1 42.5 41.0 39.0 47.3 46.8 46.3 87.0 86.0 85.0 85.3 85.0 84.7 67.1 66.4 65.7 48.8 47.8 46.8 152 150 147 122 120 118 139 137 135 67 66 65 596 592 587 73 72 71 98.5 98.0 97.4 37.5 36.0 34.5 45.8 45.3 44.8 NA 100 84.5 83.5 82.5 84.3 84.0 83.7 65.1 64.4 63.7 45.8 44.8 43.8 145 143 141 116 114 112 132 130 127 64 63 62 581 576 571 70 69 68 96.8 96.2 95.6 32.5 31.0 29.5 44.3 43.8 43.3 99.5 99.0 98.0 81.5 81.0 80.0 83.4 83.0 82.7 63.1 62.4 61.7 42.8 41.8 40.8 139 137 135 110 109 107 125 123 121 61 60 59 566 561 556 67 66 65 95.1 94.5 93.9 28.0 26.5 25.0 42.8 42.3 41.8 97.5 97.0 96.0 79.0 78.0 77.5 82.4 82.1 81.8 61.0 60.4 59.7 39.8 38.7 37.7 133 131 129 106 104 102 119 117 116 58 57 56 551 546 542 64 63 62 93.4 92.8 92.2 23.5 22.0 20.5 41.4 40.9 40.4 95.5 95.0 94.5 76.5 75.5 74.5 81.4 81.1 80.8 59.0 58.4 57.7 36.7 35.7 34.7 127 125 124 101 99 98 114 112 110 NA 537 532 527 61 60 59 91.7 91.1 90.5 19.0 17.5 16.0 40.0 39.5 39.0 93.5 93.0 92.5 74.0 73.0 72.0 80.5 80.1 79.8 57.0 56.4 55.7 33.7 32.7 31.7 122 120 118 96 95 94 108 107 106 522 517 512 58 57 56 90.0 89.4 88.8 14.5 13.0 11.5 38.6 38.1 37.7 92.0 91.0 90.5 71.0 70.5 69.5 79.5 79.2 78.8 55.0 54.4 53.7 30.7 29.7 28.7 117 115 114 92 91 90 104 103 101 507 502 497 55 54 53 88.2 87.7 87.1 10.0 8.5 7.0 37.2 36.8 36.3 90.0 89.5 89.0 68.5 68.0 67.0 78.5 78.2 77.9 53.0 52.4 51.7 27.7 26.7 25.7 112 111 110 89 87 86 100 NA 492 487 482 52 51 50 86.5 86.0 85.4 5.5 4.0 2.5 35.9 35.5 35.0 88.0 87.5 87.0 66.0 65.0 64.5 77.5 77.2 76.9 51.0 50.3 49.7 24.7 23.7 22.7 109 108 107 85 84 83 477 472 468 49 48 47 84.8 84.3 83.7 NA 34.6 34.1 33.7 86.5 85.5 85.0 63.5 62.5 61.5 76.6 76.2 75.9 49.0 48.3 47.7 21.7 20.7 19.7 106 105 104 82 81 80 463 458 453 46 45 44 83.1 82.6 82.0 33.3 32.9 32.4 84.5 84.0 83.5 61.0 60.0 59.0 75.6 75.3 74.9 47.0 46.3 45.7 18.7 17.7 16.7 103 102 101 80 79 78 448 444 439 43 42 41 81.4 80.8 80.3 32.0 31.6 31.2 82.5 82.0 81.5 58.0 57.5 56.5 74.6 74.3 74.0 45.0 44.3 43.7 15.7 14.7 13.6 100 99 98 77 76 75 435 430 426 40 39 38 79.7 79.1 78.6 30.7 30.3 29.9 81.0 80.0 79.5 55.5 54.5 54.0 73.6 73.3 73.0 43.0 42.3 41.6 12.6 11.6 10.6 97 96 95 75 74 73 422 417 413 37 36 35 78.0 77.4 76.9 29.5 29.1 28.7 79.0 78.5 78.0 NA 100 99.5 53.0 52.0 51.5 72.7 72.3 72.0 41.0 40.3 39.6 9.6 8.6 7.6 94 93 92 72 72 71 409 404 401 34 33 32 76.3 75.7 75.2 28.2 27.8 27.4 77.0 76.5 76.0 99.0 98.8 98.5 50.5 49.5 48.5 71.7 71.4 71.0 39.0 38.3 37.6 6.6 5.6 4.6 91 90 89 70 69 69 396 392 388 31 30 29 74.6 74.0 73.5 27.0 26.6 26.0 75.5 75.0 74.0 98.0 97.8 97.5 48.0 47.0 46.0 70.7 70.4 70.0 37.0 36.3 35.6 3.6 2.6 1.0 88 87 87 68 67 66 384 380 376 28 27 26 73.0 72.5 72.0 25.5 25.0 24.5 73.5 73.0 72.5 97.0 96.5 96.3 45.0 44.5 43.5 69.3 69.5 69.0 34.5 34.0 33.0 NA 86 85 84 66 65 65 372 369 365 25 24 23 71.0 70.5 70.0 24.3 24.0 23.5 72.0 71.0 70.5 96.0 95.5 95.3 42.5 41.5 41.0 68.8 68.5 68.0 32.5 32.0 31.0 83 82 82 64 64 63 361 357 353 22 21 20 69.5 69.0 68.5 23.0 22.5 22.0 70.0 69.5 68.5 95.0 94.5 94.3 40.0 39.0 38.0 67.8 67.5 67.3 30.5 29.5 29.0 81 81 80 62 62 61 350 346 343 19 18 17 68.0 67.0 66.5 21.5 21.3 21.0 68.0 67.5 67.0 94.0 93.5 93.0 37.5 36.5 35.5 67.0 66.5 66.3 28.5 27.5 27.0 79 78 78 61 60 60 339 335 332 16 15 14 66.0 65.5 65.0 20.5 20.0 NA 66.5 65.5 65.0 92.8 92.5 92.0 35.0 34.0 33.0 66.0 65.5 65.3 26.0 25.5 25.0 77 76 75 59 59 59 329 325 322 13 12 11 64.5 64.0 63.5 64.5 64.0 63.5 91.8 91.5 91.0 32.0 31.5 30.5 65.0 64.5 64.3 24.0 23.5 23.0 75 74 73 58 58 57 318 314 311 10 9 8 63.0 62.0 61.5 62.5 62.0 61.5 90.5 90.3 90.0 29.5 29.0 28.0 64.0 63.8 63.5 22.0 21.5 20.5 72 71 71 57 57 56 308 304 300 7 6 5 61.0 60.5 60.0 61.0 60.5 60.0 89.5 89.3 89.0 27.0 26.0 25.5 63.0 62.8 62.5 20.0 19.5 18.5 70 69 69 56 55 55 297 293 289 4 3 2 59.5 59.0 58.0 59.0 58.5 58.0 88.5 88.0 87.8 24.5 23.5 23.0 62.0 61.8 61.5 18.0 17.0 16.5 69 68 68 55 54 54 286 283 279 1 0 57.5 57.0 57.5 57.0 87.5 87.0 22.0 21.0 61.0 60.5 16.0 15.0 63 63 54 53 276 272 Soft Steel, Grey and Malleable Cast Iron and Most Non-Ferrous Metals Scales C, D, A Brale Diamond Indenter Diameter of Specimen - inches (mm) Observed Reading 1/8 (3.2) 1/4 (6.4) 3/8 (10) 1/2 (13) 5/8 (16) 3/4 (19) 7/8 (22) 1 (25) 1-1/4 (32) 1-1/2 (38) 90 85 80 NA 0.5 0.5 0.5 0 0.5 0.5 0 0.5 0.5 0 0 0.5 0 0 0.5 0 0 0 0 0 0 0 0 0 0 0 0 75 70 65 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0 0.5 0.5 0 0 0 0 0 0 60 55 50 1.5 2.0 2.5 1.0 1.5 2.0 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0 0.5 0.5 0 0 0.5 45 40 35 3.0 3.5 4.0 2.0 2.5 3.0 1.5 2.0 2.0 1.0 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5 30 25 20 5.0 5.5 6.0 3.5 4.0 4.5 2.5 3.0 3.5 2.0 2.5 2.5 1.5 2.0 2.0 1.5 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 Scales B, F, G 1/16-in Ball Indenter Diameter of Specimen - inches (mm) Observed Reading 1/8 (3.2) 1/4 (6.4) 3/8 (10) 1/2 (13) 5/8 (16) 3/4 (19) 7/8 (22) 1 (25) 1-1/4 (32) 1-1/2 (38) 100 90 80 NA 3.5 4.0 5.0 2.5 3.0 3.5 1.5 2.0 2.5 1.5 1.5 2.0 1.0 1.5 1.5 1.0 1.5 1.5 0.5 1.0 1.5 NA NA 70 60 50 6.0 7.0 8.0 4.0 5.0 5.5 3.0 3.5 4.0 2.5 3.0 3.5 2.0 2.5 3.0 2.0 2.0 2.5 1.5 2.0 2.0 40 30 20 9.0 10.0 11.0 6.0 6.5 7.5 4.5 5.0 5.5 4.0 4.5 4.5 3.0 3.5 4.0 2.5 3.0 3.5 2.5 2.5 3.0 10 0 12.0 12.5 8.0 8.5 6.0 6.5 5.0 5.5 4.0 4.5 3.5 3.5 3.0 3.0 Scales 15-N, 30-N, 45-N N Brale Diamond Indenter Diameter of Specimen - inches (mm) Observed Reading 1/8 (3.2) 1/4 (6.4) 3/8 (10) 1/2 (13) 5/8 (16) 3/4 (19) 7/8 (22) 1 (25) 1-1/4 (32) 1-1/2 (38) 90 85 80 0 0.5 1.0 0 0.5 0.5 0 0.5 0.5 0 0.5 0.5 0 0 0.5 0 0 0 0 0 0 0 0 0 NA NA 75 70 65 1.5 2.0 2.5 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0 0.5 0.5 0 0.5 0.5 60 55 50 3.0 3.5 3.5 1.5 2.0 2.0 1.0 1.5 1.5 1.0 1.0 1.0 1.0 1.0 1.0 0.5 0.5 1.0 0.5 0.5 1.0 0.5 0.5 0.5 45 40 35 4.0 4.5 5.0 2.0 2.5 2.5 1.5 1.5 2.0 1.0 1.5 1.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 30 25 20 5.5 5.5 6.0 3.0 3.0 3.0 2.0 2.0 2.0 1.5 1.5 1.5 1.5 1.5 1.5 1.0 1.5 1.5 1.0 1.5 1.5 1.0 1.0 1.5 Scales 15-T, 30-T, 45-T 1/16-in Ball Indenter Diameter of Specimen - inches (mm) Observed Reading 1/8 (3.2) 1/4 (6.4) 3/8 (10) 1/2 (13) 5/8 (16) 3/4 (19) 7/8 (22) 1 (25) 1-1/4 (32) 1-1/2 (38) 90 80 70 1.5 3.0 5.0 1.0 2.0 3.5 1.0 1.5 2.5 0.5 1.5 2.0 0.5 1.0 1.5 0.5 1.0 1.0 0.5 1.0 1.0 0.5 0.5 1.0 NA NA 60 50 40 6.5 8.5 10.0 4.5 5.5 6.5 3.0 4.0 4.5 2.5 3.0 3.5 2.0 2.5 3.0 1.5 2.0 2.5 1.5 2.0 2.0 1.5 1.5 2.0 30 20 11.5 13.0 7.5 9.0 5.0 6.0 3.5 4.5 3.5 4.5 2.5 3.0 2.0 2.0 2.0 2.0 Cylindrical Correction Chart 53 Cylindrical work corrections to be added to observed Rockwell number for scales indicated Rockwell Supercial Vickers Knoop Brinell Tensile Strength Micro- cial C A D G 15-N 30-N 45-N HV HK HB KSI WMN 150 kg Brale 60 kg Brale 100 kg Brale 150 kg 1/16” ball 15 kg N Brale 30 kg N Brale 45 kg N Brale 10 kg 500 gm and over 3000 kg 10 mm ball 1000 lbs/ sq in 1000 gm 80 79 78 92.0 91.5 91.0 86.5 85.5 84.5 96.5 96.3 96.0 92.0 91.5 91.0 87.0 86.5 85.5 1865 1787 1710 - - - - - - 77 76 75 90.5 90.0 89.5 84.0 83.0 82.5 95.8 95.5 95.3 90.5 90.0 89.0 84.5 83.5 82.5 1633 1556 1478 - - - - - - 74 73 72 89.0 88.5 88.0 81.5 81.0 80.0 95.0 94.8 94.5 88.5 88.0 87.0 81.5 80.5 79.5 1400 1323 1245 - - - - - - 71 70 69 87.0 86.5 86.0 79.5 78.5 78.0 94.3 94.0 93.5 86.5 86.0 85.0 78.5 77.5 76.5 1160 1076 1004 - 972 946 - 953 949 68 67 66 85.6 85.0 84.5 76.9 76.1 75.4 93.2 92.9 92.5 84.4 83.6 82.8 75.4 74.2 73.3 940 900 865 920 895 870 NA 945 942 938 65 64 63 83.9 83.4 82.8 74.5 73.8 73.0 92.2 91.8 91.4 81.9 81.1 80.1 72.0 71.0 69.9 832 800 772 846 822 799 739 722 706 934 930 926 62 61 60 82.3 81.8 81.2 72.2 71.5 70.7 91.1 90.7 90.2 79.3 78.4 77.5 68.8 67.7 66.6 746 720 697 776 754 732 688 670 654 NA 922 917 913 59 58 57 80.7 80.1 79.6 69.9 69.2 68.5 89.8 89.3 88.9 76.6 75.7 74.8 65.5 64.3 63.2 674 653 633 710 690 670 634 615 595 351 338 325 909 904 900 56 55 54 79.0 78.5 78.0 67.7 66.9 66.1 88.3 87.9 87.4 73.9 73.0 72.0 62.0 60.9 59.8 613 595 577 650 630 612 577 560 543 313 301 292 896 891 887 53 52 51 77.4 76.8 76.3 65.4 64.6 63.8 86.9 86.4 85.9 71.2 70.2 69.4 58.6 57.4 56.1 560 544 528 594 576 558 525 512 496 283 273 264 883 879 874 50 49 48 75.9 75.2 74.7 63.1 62.1 61.4 85.5 85.0 84.5 68.5 67.6 66.7 55.0 53.8 52.5 513 498 484 542 526 510 481 469 455 255 246 238 870 865 861 47 46 45 74.1 73.6 73.1 60.8 60.0 59.2 83.9 83.5 83.0 65.8 64.8 64.0 51.4 50.3 49.0 471 458 446 495 480 466 443 432 421 229 221 215 856 851 847 44 43 42 72.5 72.0 71.5 58.5 57.7 56.9 82.5 82.0 81.5 63.1 62.2 61.3 47.8 46.7 45.5 434 423 412 452 438 426 409 400 390 208 201 194 842 837 832 41 40 39 70.9 70.4 69.9 56.2 55.4 54.6 80.9 80.4 79.9 60.4 59.5 58.6 44.3 43.1 41.9 402 392 382 414 402 391 381 371 362 188 182 177 827 822 817 38 37 36 69.4 68.9 68.4 53.8 53.1 52.3 79.4 78.8 78.3 57.7 56.8 55.9 40.8 39.6 38.4 372 363 354 380 370 360 353 344 336 171 166 161 812 807 802 35 34 33 67.9 67.4 66.8 51.5 50.8 50.0 77.7 77.2 76.6 55.0 54.2 53.3 37.2 36.1 34.9 345 336 327 351 342 334 327 319 311 156 152 149 798 793 788 32 31 30 66.3 65.8 65.3 49.2 48.4 47.7 NA 92.0 76.1 75.6 75.0 52.1 51.3 50.4 33.7 32.5 31.3 318 310 302 326 318 311 301 294 286 146 141 138 783 778 773 29 28 27 64.6 64.3 63.8 47.0 46.1 45.2 91.0 90.0 89.0 74.5 73.9 73.3 49.5 48.6 47.7 30.1 28.9 27.8 294 286 279 304 297 290 279 271 264 135 131 128 768 762 757 26 25 24 63.3 62.8 62.4 44.6 43.8 43.1 88.0 87.0 86.0 72.8 72.2 71.6 46.8 45.9 45.0 26.7 25.5 24.3 272 266 260 284 278 272 258 253 247 125 123 119 751 746 741 23 22 21 62.0 61.5 61.0 42.1 41.6 40.9 84.5 83.5 82.5 71.0 70.5 69.9 44.0 43.2 42.3 23.1 22.0 20.7 254 248 243 266 261 256 243 237 231 117 115 112 736 730 725 20 60.5 40.1 81.0 69.4 41.5 19.6 238 251 226 110 720 Hardened Steel and Hardened Alloys Note 1: A 10 mm steel ball was used for 450 BHN and below. A 10 mm carbide ball was used above 450 BHN. 2: The tensile strength relation to hardness is not exact, even for steel, unless it is determined for a speci c material. These corrections are approximate only and represent the averages to the nearest 1/2 Rockwell number. Any greater thickness and hardness can be safely tested on indicated scale Rockwell Supercial Hardness Scales Rockwell Regular Hardness Scales 15N 30N 45N A D C 15 kgf 30 kgf 45 kgf 60 kgf 100 kgf 150 kgf Thickness inches (mm) N Brale Indenter Brale Indenter .006 (0.15) 92 - - - - - .008 (0.20) 90 - - - - - .010 (0.25) 88 - - - - - .012 (0.30) 83 82 77 - - - .014 (0.36) 76 78.5 74 - - - .016 (0.41) 68 74 72 86 - - .018 (0.46) × 66 68 84 - - .020 (0.51) × 57 63 82 77 - .022 (0.56) × 47 58 79 75 69 .024 (0.61) × × 51 76 72 67 .026 (0.66) × × 37 71 68 65 .028 (0.71) × × 20 67 63 62 .030 (0.76) × × × 60 58 57 .032 (0.81) × × × × 51 52 .034 (0.86) × × × × 43 45 .036 (0.91) × × × × × 37 .038 (0.96) × × × × × 28 .040 (1.02) × × × × × 20 Any greater thickness and hardness can be safely tested on indicated scale Rockwell Supercial Hardness Scales Rockwell Regular Hardness Scales 15-T 30-T 45-T F B G 15 kgf 30 kgf 45 kgf 60 kgf 100 kgf 150 kgf Thickness inches (mm) 1/16-in Ball Indenter 1/16-in Ball Indenter .010 (0.25) 91 - - - - - .012 (0.30) 86 - - - - - .014 (0.36) 81 80 - - - - .016 (0.41) 75 72 71 - - - .018 (0.46) 68 64 62 - - - .020 (0.51) × 55 53 - - - .022 (0.56) × 45 43 - - - .024 (0.61) × 34 31 98 94 94 .026 (0.66) × × 18 91 87 87 .028 (0.71) × × 4 85 80 76 .030 (0.76) × × × 77 71 68 .032 (0.81) × × × 69 62 59 .034 (0.86) × × × × 52 50 .036 (0.91) × × × × 40 42 .038 (0.96) × × × × 28 31 .040 (1.02) × × × × × 22 Hardness vs Minimum Thickness Chart 55 X = No minimum hardness. These are approximate numbers only . The values shown are approximate only. This chart is intended primarily as a reference guide. Worldwide Service Network | 1-800-473-7838 Wilson Instruments is an Instron ® ITW company and is backed by Instron’s professional service force. It is the industry’s largest and most responsive group, including factory trained and certied service engineers, application engineers, and service specialists. Instron eld personnel expertise is just a phone call away. Services include: Calibration and Certication Preventative Maintenance Emergency Service Installation and Relocation On-site Parts and Accessories Application Support and Solutions On-site Training Hardness Products Wilson Instruments offers a full range of Wilson testing products and technology to meet virtually any hardness testing application and budget. Rockwell Testers Knoop and Vickers Testers Image Analysis and Automatic Systems Brinell Testers Universal Hardness Testers Shore ® Durometers for Rubber and Plastic Portable Testers Custom Solutions Test Blocks, Indenters, and Accessories NOTE 2 NOTE 2 NOTE 1 1.800.695.4273 | 1.781.575.6000 www.wilson-hardness.com Originator of the Rockwell ® Tester Americas | Europe | Asia Conversion Chart ®
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Wilson Conversion Chart

Oct 29, 2014

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Page 1: Wilson Conversion Chart

Conversions All values, except WMN, are consistent with ASTM E140 Tables 1 and 2, and ASTM A370 Tables 3A and 3B, where applicable. WMN or Wilson Microfi cial Numbers were developed by Wilson Instruments in the Wilson Standards laboratory and are not derived from ASTM.

Cylindrical Corrections Values are consistent with ASTM E18 Table 6,7,13, and 14Hardness vs. Minimum Thickness Values are consistent with ASTM E18 Tables 4, 5, 11, and 12 except for D and G scale values, which are obtained from indentation hardness testing by Vincent E. Lysaght.

Rockwell Superfi cial Knoop Brinell TensileStrength

Micro-fi cial

B F G A E H K 15-T 30-T 45-T HK HB HBHV KSI WMN

100 kg

1/16”ball

60 kg

1/16” ball

150 kg

1/16”ball

60 kg

Brale

100 kg

1/8”ball

60 kg

1/8” ball

150 kg

1/8”ball

15kg

1/16”ball

30 kg

1/16” ball

45kg

1/16”ball

500 gmandover

500 kg10 mm ball

3000 kg

10 kg

1000lbs/sq in

1000 gm

1009998

82.581.079.0

61.560.960.2

93.192.892.5

83.182.581.8

72.971.970.9

251246241

201195189

240234228

116114109

730725719

979695

77.576.074.0

59.558.958.3

92.191.891.5

81.180.479.8

69.968.967.9

236231226

184179175

222216210

104102100

713707701

949392

72.571.069.0

57.657.056.4

NA100

91.290.890.5

79.178.477.8

66.965.964.8

221216211

171167163

205200195

989492

696690684

919089

67.566.064.0

55.855.254.6

99.598.598.0

90.289.989.5

77.176.475.8

63.862.861.8

206201196

160157154

190185180

908988

679674668

888786

62.561.059.0

54.053.452.8

97.096.595.5

89.288.988.6

75.174.473.8

60.859.858.8

192188184

151148145

176172169

868483

662656651

858483

57.556.054.0

52.351.751.1

94.594.093.0

88.287.987.6

73.172.471.8

57.856.855.8

180176173

142140137

165162159

828180

646640634

828180

52.551.049.0

50.650.049.5

92.091.090.5

87.386.986.6

71.170.469.7

54.853.852.8

170167164

135133130

156153150

777372

629624618

797877

47.546.044.0

48.948.447.9

89.588.588.0

86.386.085.6

69.168.467.7

51.850.849.8

161158155

128126124

147144141

706968

612607602

767574

NA99.699.1

42.541.039.0

47.346.846.3

87.086.085.0

85.385.084.7

67.166.465.7

48.847.846.8

152150147

122120118

139137135

676665

596592587

737271

98.598.097.4

37.536.034.5

45.845.344.8

NA100

84.583.582.5

84.384.083.7

65.164.463.7

45.844.843.8

145143141

116114112

132130127

646362

581576571

706968

96.896.295.6

32.531.029.5

44.343.843.3

99.599.098.0

81.581.080.0

83.483.082.7

63.162.461.7

42.841.840.8

139137135

110109107

125123121

616059

566561556

676665

95.194.593.9

28.026.525.0

42.842.341.8

97.597.096.0

79.078.077.5

82.482.181.8

61.060.459.7

39.838.737.7

133131129

106104102

119117116

585756

551546542

646362

93.492.892.2

23.522.020.5

41.440.940.4

95.595.094.5

76.575.574.5

81.481.180.8

59.058.457.7

36.735.734.7

127125124

1019998

114112110

NA 537532527

616059

91.791.190.5

19.017.516.0

40.039.539.0

93.593.092.5

74.073.072.0

80.580.179.8

57.056.455.7

33.732.731.7

122120118

969594

108107106

522517512

585756

90.089.488.8

14.513.011.5

38.638.137.7

92.091.090.5

71.070.569.5

79.579.278.8

55.054.453.7

30.729.728.7

117115114

929190

104103101

507502497

555453

88.287.787.1

10.08.57.0

37.236.836.3

90.089.589.0

68.568.067.0

78.578.277.9

53.052.451.7

27.726.725.7

112111110

898786

100NA

492487482

525150

86.586.085.4

5.54.02.5

35.935.535.0

88.087.587.0

66.065.064.5

77.577.276.9

51.050.349.7

24.723.722.7

109108107

858483

477472468

494847

84.884.383.7

NA 34.634.133.7

86.585.585.0

63.562.561.5

76.676.275.9

49.048.347.7

21.720.719.7

106105104

828180

463458453

464544

83.182.682.0

33.332.932.4

84.584.083.5

61.060.059.0

75.675.374.9

47.046.345.7

18.717.716.7

103102101

807978

448444439

434241

81.480.880.3

32.031.631.2

82.582.081.5

58.057.556.5

74.674.374.0

45.044.343.7

15.714.713.6

1009998

777675

435430426

403938

79.779.178.6

30.730.329.9

81.080.079.5

55.554.554.0

73.673.373.0

43.042.341.6

12.611.610.6

979695

757473

422417413

373635

78.077.476.9

29.529.128.7

79.078.578.0

NA10099.5

53.052.051.5

72.772.372.0

41.040.339.6

9.68.67.6

949392

727271

409404401

343332

76.375.775.2

28.227.827.4

77.076.576.0

99.098.898.5

50.549.548.5

71.771.471.0

39.038.337.6

6.65.64.6

919089

706969

396392388

313029

74.674.073.5

27.026.626.0

75.575.074.0

98.097.897.5

48.047.046.0

70.770.470.0

37.036.335.6

3.62.61.0

888787

686766

384380376

282726

73.072.572.0

25.525.024.5

73.573.072.5

97.096.596.3

45.044.543.5

69.369.569.0

34.534.033.0

NA 868584

666565

372369365

252423

71.070.570.0

24.324.023.5

72.071.070.5

96.095.595.3

42.541.541.0

68.868.568.0

32.532.031.0

838282

646463

361357353

222120

69.569.068.5

23.022.522.0

70.069.568.5

95.094.594.3

40.039.038.0

67.867.567.3

30.529.529.0

818180

626261

350346343

191817

68.067.066.5

21.521.321.0

68.067.567.0

94.093.593.0

37.536.535.5

67.066.566.3

28.527.527.0

797878

616060

339335332

161514

66.065.565.0

20.520.0NA

66.565.565.0

92.892.592.0

35.034.033.0

66.065.565.3

26.025.525.0

777675

595959

329325322

131211

64.564.063.5

64.564.063.5

91.891.591.0

32.031.530.5

65.064.564.3

24.023.523.0

757473

585857

318314311

1098

63.062.061.5

62.562.061.5

90.590.390.0

29.529.028.0

64.063.863.5

22.021.520.5

727171

575756

308304300

765

61.060.560.0

61.060.560.0

89.589.389.0

27.026.025.5

63.062.862.5

20.019.518.5

706969

565555

297293289

432

59.559.058.0

59.058.558.0

88.588.087.8

24.523.523.0

62.061.861.5

18.017.016.5

696868

555454

286283279

10

57.557.0

57.557.0

87.587.0

22.021.0

61.060.5

16.015.0

6363

5453

276272

Soft Steel, Grey and Malleable Cast Iron and Most Non-Ferrous Metals Scales C, D, A

Brale Diamond IndenterDiameter of Specimen - inches (mm)

ObservedReading

1/8(3.2)

1/4(6.4)

3/8(10)

1/2(13)

5/8(16)

3/4(19)

7/8(22)

1(25)

1-1/4(32)

1-1/2(38)

908580

NA 0.50.50.5

00.50.5

00.50.5

00

0.5

00

0.5

000

000

000

000

757065

1.01.01.5

0.51.01.0

0.50.51.0

0.50.50.5

0.50.50.5

0.50.50.5

00.50.5

000

000

605550

1.52.02.5

1.01.52.0

1.01.01.5

0.51.01.0

0.50.51.0

0.50.50.5

0.50.50.5

00.50.5

00

0.5454035

3.03.54.0

2.02.53.0

1.52.02.0

1.01.51.5

1.01.01.5

1.01.01.0

0.51.01.0

0.50.50.5

0.50.50.5

302520

5.05.56.0

3.54.04.5

2.53.03.5

2.02.52.5

1.52.02.0

1.51.51.5

1.01.01.5

1.01.01.0

0.51.01.0

Scales B, F, G1/16-in Ball Indenter

Diameter of Specimen - inches (mm)

ObservedReading

1/8(3.2)

1/4(6.4)

3/8(10)

1/2(13)

5/8(16)

3/4(19)

7/8(22)

1(25)

1-1/4(32)

1-1/2(38)

1009080

NA 3.54.05.0

2.53.03.5

1.52.02.5

1.51.52.0

1.01.51.5

1.01.51.5

0.51.01.5

NA NA

706050

6.07.08.0

4.05.05.5

3.03.54.0

2.53.03.5

2.02.53.0

2.02.02.5

1.52.02.0

403020

9.010.011.0

6.06.57.5

4.55.05.5

4.04.54.5

3.03.54.0

2.53.03.5

2.52.53.0

100

12.012.5

8.08.5

6.06.5

5.05.5

4.04.5

3.53.5

3.03.0

Scales 15-N, 30-N, 45-NN Brale Diamond Indenter

Diameter of Specimen - inches (mm)

ObservedReading

1/8(3.2)

1/4(6.4)

3/8(10)

1/2(13)

5/8(16)

3/4(19)

7/8(22)

1(25)

1-1/4(32)

1-1/2(38)

908580

00.51.0

00.50.5

00.50.5

00.50.5

00

0.5

000

000

000

NA NA

757065

1.52.02.5

1.01.01.5

0.51.01.0

0.50.50.5

0.50.50.5

0.50.50.5

00.50.5

00.50.5

605550

3.03.53.5

1.52.02.0

1.01.51.5

1.01.01.0

1.01.01.0

0.50.51.0

0.50.51.0

0.50.50.5

454035

4.04.55.0

2.02.52.5

1.51.52.0

1.01.51.5

1.01.01.0

1.01.01.0

1.01.01.0

1.01.01.0

302520

5.55.56.0

3.03.03.0

2.02.02.0

1.51.51.5

1.51.51.5

1.01.51.5

1.01.51.5

1.01.01.5

Scales 15-T, 30-T, 45-T1/16-in Ball Indenter

Diameter of Specimen - inches (mm)

ObservedReading

1/8(3.2)

1/4(6.4)

3/8(10)

1/2(13)

5/8(16)

3/4(19)

7/8(22)

1(25)

1-1/4(32)

1-1/2(38)

908070

1.53.05.0

1.02.03.5

1.01.52.5

0.51.52.0

0.51.01.5

0.51.01.0

0.51.01.0

0.50.51.0

NA NA

605040

6.58.5

10.0

4.55.56.5

3.04.04.5

2.53.03.5

2.02.53.0

1.52.02.5

1.52.02.0

1.51.52.0

3020

11.513.0

7.59.0

5.06.0

3.54.5

3.54.5

2.53.0

2.02.0

2.02.0

Cylindrical Correction Chart 53Cylindrical work corrections to be added to observed

Rockwell number for scales indicated

Rockwell Superfi cial Vickers Knoop Brinell TensileStrength

Micro-fi cial

C A D G 15-N 30-N 45-N HV HK HB KSI WMN

150 kg

Brale

60 kg

Brale

100 kg

Brale

150 kg

1/16” ball

15 kg N

Brale

30 kg N

Brale

45 kg N

Brale

10 kg

500 gmand over

3000 kg10 mm ball

1000 lbs/sq in

1000 gm

807978

92.091.591.0

86.585.584.5

96.596.396.0

92.091.591.0

87.086.585.5

186517871710

---

---

777675

90.590.089.5

84.083.082.5

95.895.595.3

90.590.089.0

84.583.582.5

163315561478

---

---

747372

89.088.588.0

81.581.080.0

95.094.894.5

88.588.087.0

81.580.579.5

140013231245

---

---

717069

87.086.586.0

79.578.578.0

94.394.093.5

86.586.085.0

78.577.576.5

116010761004

-972946

-953949

686766

85.685.084.5

76.976.175.4

93.292.992.5

84.483.682.8

75.474.273.3

940900865

920895870 NA

945942938

656463

83.983.482.8

74.573.873.0

92.291.891.4

81.981.180.1

72.071.069.9

832800772

846822799

739722706

934930926

626160

82.381.881.2

72.271.570.7

91.190.790.2

79.378.477.5

68.867.766.6

746720697

776754732

688670654 NA

922917913

595857

80.780.179.6

69.969.268.5

89.889.388.9

76.675.774.8

65.564.363.2

674653633

710690670

634615595

351338325

909904900

565554

79.078.578.0

67.766.966.1

88.387.987.4

73.973.072.0

62.060.959.8

613595577

650630612

577560543

313301292

896891887

535251

77.476.876.3

65.464.663.8

86.986.485.9

71.270.269.4

58.657.456.1

560544528

594576558

525512496

283273264

883879874

504948

75.975.274.7

63.162.161.4

85.585.084.5

68.567.666.7

55.053.852.5

513498484

542526510

481469455

255246238

870865861

474645

74.173.673.1

60.860.059.2

83.983.583.0

65.864.864.0

51.450.349.0

471458446

495480466

443432421

229221215

856851847

444342

72.572.071.5

58.557.756.9

82.582.081.5

63.162.261.3

47.846.745.5

434423412

452438426

409400390

208201194

842837832

414039

70.970.469.9

56.255.454.6

80.980.479.9

60.459.558.6

44.343.141.9

402392382

414402391

381371362

188182177

827822817

383736

69.468.968.4

53.853.152.3

79.478.878.3

57.756.855.9

40.839.638.4

372363354

380370360

353344336

171166161

812807802

353433

67.967.466.8

51.550.850.0

77.777.276.6

55.054.253.3

37.236.134.9

345336327

351342334

327319311

156152149

798793788

323130

66.365.865.3

49.248.447.7

NA92.0

76.175.675.0

52.151.350.4

33.732.531.3

318310302

326318311

301294286

146141138

783778773

292827

64.664.363.8

47.046.145.2

91.090.089.0

74.573.973.3

49.548.647.7

30.128.927.8

294286279

304297290

279271264

135131128

768762757

262524

63.362.862.4

44.643.843.1

88.087.086.0

72.872.271.6

46.845.945.0

26.725.524.3

272266260

284278272

258253247

125123119

751746741

232221

62.061.561.0

42.141.640.9

84.583.582.5

71.070.569.9

44.043.242.3

23.122.020.7

254248243

266261256

243237231

117115112

736730725

20 60.5 40.1 81.0 69.4 41.5 19.6 238 251 226 110 720

Hardened Steel and Hardened Alloys

Note 1: A 10 mm steel ball was used for 450 BHN and below. A 10 mm carbide ball was used above 450 BHN.2: The tensile strength relation to hardness is not exact, even for steel, unless it is determined for a specifi c material.

These corrections are approximate only and represent the averages to the nearest 1/2 Rockwell number.

Any greater thickness and

hardness can besafely tested onindicated scale

RockwellSuperfi cial

Hardness Scales

RockwellRegular

Hardness Scales

15N 30N 45N A D C15kgf

30kgf

45kgf

60kgf

100kgf

150kgf

Thicknessinches (mm)

N BraleIndenter

BraleIndenter

.006 (0.15) 92 - - - - -

.008 (0.20) 90 - - - - -

.010 (0.25) 88 - - - - -

.012 (0.30) 83 82 77 - - -

.014 (0.36) 76 78.5 74 - - -

.016 (0.41) 68 74 72 86 - -

.018 (0.46) × 66 68 84 - -

.020 (0.51) × 57 63 82 77 -

.022 (0.56) × 47 58 79 75 69

.024 (0.61) × × 51 76 72 67

.026 (0.66) × × 37 71 68 65

.028 (0.71) × × 20 67 63 62

.030 (0.76) × × × 60 58 57

.032 (0.81) × × × × 51 52

.034 (0.86) × × × × 43 45

.036 (0.91) × × × × × 37

.038 (0.96) × × × × × 28

.040 (1.02) × × × × × 20Any greater

thickness andhardness can besafely tested onindicated scale

RockwellSuperfi cial

Hardness Scales

RockwellRegular

Hardness Scales

15-T 30-T 45-T F B G15kgf

30kgf

45kgf

60kgf

100kgf

150kgf

Thicknessinches (mm)

1/16-in BallIndenter

1/16-in BallIndenter

.010 (0.25) 91 - - - - -

.012 (0.30) 86 - - - - -

.014 (0.36) 81 80 - - - -

.016 (0.41) 75 72 71 - - -

.018 (0.46) 68 64 62 - - -

.020 (0.51) × 55 53 - - -

.022 (0.56) × 45 43 - - -

.024 (0.61) × 34 31 98 94 94

.026 (0.66) × × 18 91 87 87

.028 (0.71) × × 4 85 80 76

.030 (0.76) × × × 77 71 68

.032 (0.81) × × × 69 62 59

.034 (0.86) × × × × 52 50

.036 (0.91) × × × × 40 42

.038 (0.96) × × × × 28 31

.040 (1.02) × × × × × 22

Hardness vs Minimum Thickness Chart 55

X = No minimum hardness. These are approximate numbers only.

The values shown are approximate only. This chart is intended primarily as a reference guide.

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