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Table – Hardness Conversion

Hardness Conversion Table

RELATIONSHIP BETWEEN BRINELL, ROCKWELL, AND TENSILE STRENGTH FOR TOOL AND ALLOY STEELS
Brinell Rockwell Tensile BrinelI Rockwell Tensile
3000 KG. LOAD 10 MM BALL C SCALE B SCALE 1000 POUNDS PER SQ. IN. 3000 KG. LOAD 10 MM BALL C SCALE B SCALE 1000 POUNDS PER SQ. IN.
IMP. DIA. M M. HARD NESS NO. 150 KG. SCALE 100 KG. BALL IMP. DIA. MM. HARD- NESS NO. 150 KG. SCALE 100 KG. BALL
2.20 780 68 382 4.15 212 17 95 104
2.25 745 66 365 4.20 207 16 95 101
2.30 712 65 349 4.25 201 15 94 99
2.35 682 63 334 4.30 197 14 93 97
2.40 653 62 320 4.35 192 13 92 95
2.45 627 60 307 4.40 187 11 91 93
2.50 601 58 294 4.45 183 10 90 91
2.55 578 57 283 4.50 179 9 89 89
2.60 555 55 272 4.55 174 7 88 87
2.65 534 53 261 4.60 170 6 87 85
2.70 514 52 252 4.65 167 5 86 84
2.75 495 50 242 4.70 163 3 85 82
2.80 477 49 234 4.75 159 2 84 80
2.85 461 48 226 4.80 156 1 83 79
2.90 444 46 217 4.85 152 0 82 77
2.95 429 45 210 4.90 149 81 75.
3.00 415 44 203 4.95 146 80 74
3.05 401 42 196 5.00 143 79 72
3.10 388 41 112 190 5.05 140 78 71
3.15 375 40 111 184 5.10 137 77 70
3.20 363 39 110 178 5.15 134 75 69
3.25 352 38 109 172 5.20 131 74 67
3.30 341 37 108 167 5.25 128 73 66
3.35 331 36 108 162 5.30 126 72 65
3.40 321 35 107 157 5.35 123 71 63
3.45 311 34 106 152 5.40 121 70 62
3.50 302 33 106 148 5.45 118 68 61
3.55 293 32 105 144 5.50 116 67 60
3.60 285 30 104 140 5.55 114 66 58
3.65 277 29 104 136 5.60 111 65 57
3.70 269 28 103 132 5.65 109 63 56
3.75 262 27 102 128 5.70 107 62 55
3.80 255 26 101 125 5.75 105 60 54
3.85 248 25 100 122 5.80 103 58 53
3.90 241 23 100 118 5.85 101 58 52
3.95 235 22 99 115 5.90 99 56 51
4.00 229 21 98 112 5.95 97 55 50
4.05 223 20 97 109 6.00 95 54 49
4.10 217 18 96 106
Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.

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