Hardness Conversion Table
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BRINELL ROCKWELL
Indentation Diameter, mm. Hardness, C-Scale Hardness Number B-Scale
10 mm. Tungsten Carbide Ball 3000 kg. Load 100 kg. load, 1/16" Diameter Ball
--- --- 68 ---
--- --- 67 ---
2.25 745 65.3 ---
2.3 712 --- ---
2.35 682 61.7 ---
2.4 653 60 ---
2.45 627 58.7 ---
2.5 601 57.3 ---
2.55 578 56 ---
2.6 555 54.7 ---
2.65 534 53.5 ---
2.7 514 52.1 ---
2.75 495* 51 ---
2.8 477 49.6 ---
2.85 461 48.5 ---
2.9 444 47.1 ---
2.95 429 45.7 ---
3 415 44.5 ---
3.05 401 43.1 ---
3.1 388 41.8 ---
3.15 375 40.4 ---
3.2 363 39.1 ---
3.25 352 37.9 -110
3.3 341 36.6 -109
3.35 331 35.5 -108.5
3.4 321 34.3 -108
3.45 311 33.1 -107.5
3.5 302 32.1 -107
3.55 293 30.9 -106
3.6 285 29.9 -105.5
3.65 277 28.8 -104.5
3.7 269 27.6 -104
3.75 262 26.6 -103
3.8 255 25.4 -102
3.85 248 24.2 -101
3.9 241 22.8 100
3.95 235 21.7 99
4 229 20.6 98.2
4.05 223 -18.8 97.3
4.1 217 -17.5 96.4
4.15 212 -16 95.5
4.2 207 -15.2 94.6
4.25 201 -13.8 93.8
4.3 197 -12.7 92.8
4.35 192 -11.5 91.9
4.4 187 -10 90.7
4.45 183 -9 90
4.5 179 -8 89
4.55 174 -6.4 87.8
4.6 170 -5.4 86.8
4.65 167 -4.4 86
4.7 163 -3.3 85
4.75 159 -2 83.9
4.8 156 -0.9 82.9
4.9 149 --- 80.8
5 143 --- 78.7
5.1 137 --- 76.4
5.2 131 --- 74
5.3 126 --- 72
*BHN above 495 are for carbide ball only
Note: Values shown in parentheses are beyond the normal range and are for comparison only.

(These values shown are based on ASTM E10-93, E140-95 and ASM Reference Book, 3rd Ed.)

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