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 |