Hardness Conversion Chart | Precision Grinding, Inc.
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Hardness Conversion Chart


Comparison of Hardnesses standards including Brinell, Rockwell B scale, Rockwell C scale, Vickers and others.

***SCROLL DOWN TO SEE EACH SCALE

Brinell Hardness Rockwell B Scale Rockwell C Scale Vickers Hardness Number Knoop Hardness Rockwell A Scale Rockwell F Scale 15T Scale 30T Scale 45T Scale Approximate Tensile Strength
739 65 832 846 83.9
722 64 800 822 83.4
706 63 772 799 82.8
688 62 746 776 82.3
670 61 720 754 81.8
654 60 697 732 81.2
634 59 674 710 80.7 351
615 58 653 690 80.1 338
595 57 633 670 79.6 325
577 56 613 650 79.0 313
560 55 595 630 78.5 301
543 54 577 612 78.0 292
525 53 560 594 77.4 283
512 52 544 576 76.8 273
496 51 528 558 76.3 264
482 50 513 542 75.9 255
468 49 498 526 75.2 246
455 48 484 510 74.7 238
442 47 471 495 74.1 229
432 46 458 480 73.6 221
421 45 446 466 73.1 215
409 44 434 452 72.5 208
400 43 423 438 72.0 201
390 42 412 426 71.5 194
381 41 402 414 70.9 188
371 40 392 402 70.4 182
362 39 382 391 69.9 177
353 110 38 372 380 69.4 171
344 109.5 37 363 370 68.9 166
336 109 36 354 360 68.4 161
327 108.5 35 345 351 67.9 156
319 108 34 336 342 67.4 152
311 107.5 33 327 334 66.8 149
301 107 32 318 326 66.3 146
294 106 31 310 318 65.8 141
286 105.5 30 302 311 65.3 138
279 105 29 294 304 64.6 135
271 104.5 28 286 297 64.3 131
264 103.5 27 279 290 63.8 128
258 102.5 26 272 284 63.3 125
253 102 25 266 278 62.8 123
247 101 24 260 272 62.4 119
243 100.5 23 254 266 62.0 117
240 100 22.8 240 251 61.5 93.1 83.1 72.9 116
234 99 21.7 234 246 60.9 92.8 82.5 71.9 114
228 98 20.5 228 241 60.2 92.5 81.8 70.9 109
222 97 18.0 222 236 59.5 92.1 81.1 69.9 104
216 96 17.0 216 231 58.9 91.8 80.4 68.9 102
210 95 15.5 210 226 58.3 91.5 79.8 67.9 100
205 94 14.0 205 221 57.6 91.2 79.1 66.9 98
200 93 13.0 200 216 57.0 90.8 78.4 65.9 94
195 92 11.5 195 211 56.4 90.5 77.8 64.8 92
190 91 10.0 190 206 55.8 90.2 77.1 63.8 90
185 90 9.0 185 201 55.2 89.9 76.4 62.8 89
180 89 8.0 180 196 54.6 89.5 75.8 61.8 88
176 88 6.4 176 192 54.0 89.2 75.1 60.8 86
172 87 5.4 172 188 53.4 88.9 74.4 59.8 84
169 86 4.5 169 184 52.8 88.6 73.8 58.8 83
165 85 3.3 165 180 52.3 88.2 73.1 57.8 82
162 84 2.0 162 176 51.7 87.9 72.4 56.8 81
159 83 1.0 159 173 51.1 87.6 71.9 55.8 80
156 82 156 170 50.6 87.3 71.1 54.8 77
153 81 153 167 50.0 86.9 70.4 53.8 73
150 80 150 164 49.5 86.6 69.7 52.8 72
147 79 147 161 48.9 86.3 69.1 51.8 70
144 78 144 158 48.4 86.0 68.4 50.8 69
141 77 141 155 47.9 85.6 67.7 49.8 68
139 76 139 152 47.3 85.3 67.1 48.8 67
137 75 137 150 46.8 99.6 85.0 66.4 47.8 66
135 74 135 147 46.3 99.1 84.7 65.7 46.8 65
132 73 132 145 45.8 98.5 84.3 65.1 45.8 65
130 72 130 143 45.3 98.0 84.0 64.4 44.8 63
127 71 127 141 44.8 97.4 83.7 63.7 43.8 62
125 70 125 139 44.3 96.8 83.4 63.1 42.8 61
123 69 123 137 43.8 96.2 83.0 62.4 41.8 60
121 68 121 135 43.3 95.6 82.7 61.7 40.8 59
119 67 119 133 42.8 95.1 82.4 61.0 39.8 58
117 66 117 131 42.3 94.5 82.1 60.4 38.7 57
116 65 116 129 41.8 93.9 81.8 59.7 37.7 56
114 64 114 127 41.4 93.4 81.4 59.0 36.7
112 63 112 125 40.9 92.8 81.1 58.4 35.7
110 62 110 124 40.4 92.2 80.8 57.7 34.7
108 61 108 122 40.0 91.7 80.5 57.0 33.7
107 60 107 120 39.5 91.1 80.1 56.4 32.7
106 59 106 118 39.0 90.5 79.8 55.7 31.7
104 58 104 117 38.6 90.0 79.5 55.0 30.7
103 57 103 115 38.1 89.4 79.2 54.4 29.7
101 56 101 114 37.7 88.8 78.8 53.7 28.7
100 55 100 112 37.2 88.2 78.5 53.0 27.7
54 111 36.8 87.7 78.2 52.4 26.7
53 110 36.3 86.5 77.9 51.7 25.7
52 109 35.9 86.0 77.5 51.0 24.7
51 108 35.5 85.4 77.2 50.3 23.7
50 107 35.0 84.8 76.9 49.7 22.7
49 106 34.6 84.3 76.6 49.0 21.7
48 105 34.1 83.7 76.2 48.3 20.7
47 104 33.7 83.1 75.9 47.7 19.7
46 103 33.3 75.6 47.0 18.7
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