Hardness Conversion for Steel

Brinell 3000kg Load, 10mm Ball Rockwell Brinell 500kg Load, 10mm Ball
Diameter (mm) Hardness Number A Scale B Scale C Scale 15-N Scale Shore Scleroscope Tensile Strength
(approx. PSI)		 B Scale F Scale 15-T Scale 30-T Scale E Scale H Scale A Scale
2.25 745 84.1 65.3 92.3 91 74 99.0 66.0 46.0 118
2.30 712 72 98.0 84.0 65.0 45.0 114
2.35 682 82.2 61.7 91.0 84 70 97.0 83.5 63.5 99.5 44.0 110
2.40 653 81.2 60.0 90.2 81 68 95.5 62.0 98.0 43.0 107
2.45 627 80.5 58.7 89.6 79 66 94.5 82.0 60.5 97.0 42.0 104
2.50 601 79.8 57.3 89.0 77 64 93.5 81.5 59.5 95.5 41.5 101
2.55 578 79.1 56.0 88.4 75 62 92.0 58.0 94.5 40.5 98
2.60 555 78.4 54.7 87.8 73 298 60 91.0 56.5 93.0 39.5 95
2.65 534 77.8 53.5 87.2 71 288 58 90.0 79.5 55.0 92.0 38.5 92
2.70 514 76.9 52.1 86.5 70 274 56 89.0 79.0 54.0 90.5 90
2.75 495 76.3 51.0 85.9 68 264 54 87.5 52.5 89.5 37.0 87
2.80 477 75.6 49.6 85.3 66 252 52 86.5 77.5 51.0 88.0 36.0 87
2.85 461 74.9 48.5 84.7 65 242 50 85.5 77.0 49.5 87.0 35.0 83
2.90 444 74.2 47.1 84.0 63 230 48 84.5 48.5 85.5 34.5 81
2.95 429 73.4 45.7 83.4 61 219 46 83.0 75.5 47.0 84.5 33.5
3.00 415 69.3 44.5 82.8 59 212 44 82.0 75.0 45.5 83.5 32.5 78
3.05 401 72.0 43.1 82.0 58 202 42 81.0 44.0 82.0 31.5 76
3.10 388 71.4 41.8 81.4 56 193 40 79.5 73.5 43.0 81.0
3.15 375 70.6 40.4 80.6 54 184 38 78.5 73.0 41.5 79.5 30.0 73
3.20 363 70.0 39.1 80.0 52 177 36 77.5 40.0 78.5 100.0 29.0
3.25 352 69.3 110.0 37.9 79.3 51 170 34 76.5 71.5 38.5 77.0 99.0 28.0 70
3.30 341 68.7 109.0 36.6 78.6 50 163 32 75.0 71.0 37.5 76.0 98.5 27.5
3.35 331 68.7 109.0 36.6 78.0 48 158 30 74.0 70.5 36.0 75.0 26.5 67
3.40 321 67.5 108.0 34.3 77.3 47 152 28 73.0 34.5 73.5 97.0 25.5 66
3.45 311 66.9 107.5 33.1 76.7 46 147 26 72.0 69.0 33.0 72.5 24.5 65
3.50 302 63.6 107.0 32.1 76.1 45 143 24 70.5 68.5 32.0 71.0 95.5 24.0
3.55 293 63.0 106.0 30.9 75.5 46 139 22 69.5 30.5 70.0 95.0 23.0
3.60 285 62.5 105.5 29.9 75.0 136 20 68.5 29.0 68.5 22.0
3.65 277 61.8 104.5 28.8 74.4 41 131 18 67.0 66.5 27.5 67.5 93.5
3.70 269 61.4 104.0 27.6 73.7 40 128 16 66.0 66.0 26.0 66.5 20.5
3.75 262 60.8 103.0 26.6 73.1 39 125 14 65.0 25.0 65.0 92.0
3.80 255 102.0 25.4 72.5 38 121 12 64.0 64.5 23.5 64.0 91.5
3.85 248 101.0 24.2 71.7 37 118 10 63.0 64.0 22.0 62.5 90.5 57
3.90 241 100.0 22.8 70.9 36 114 8 61.5 63.5 20.5 61.5 90.0
3.95 235 99.0 21.7 70.3 35 111 6 60.5 19.5 60.5
4.00 229 98.2 20.5 69.7 34 109 4 59.5 62.0 18.0 59.0 88.5
4.05 223 97.3 18.8 104 2 58.0 61.5 16.5 58.0 54
4.10 217 96.4 17.5 33 103 0 57.0 15.0 87.0 53
4.15 212 95.5 16.0 100
4.20 207 94.6 15.2 32 99
4.25 201 93.8 13.8 31 97
4.30 197 92.8 12.7 30 94
4.35 192 91.9 11.5 29 92
4.40 187 90.7 10.0 89
4.45 183 90.0 9.0 28 89
4.50 179 89.0 8.0 27 88
4.55 174 87.8 6.4 86
4.60 170 86.8 5.4 26 84
4.65 167 86.0 4.4 83
4.70 163 85.0 3.3 25 82
4.80 156 82.9 0.9 80
4.90 149 80.8 23
5.00 143 78.7 22
5.10 137 76.4 21
5.20 131 74.0
5.30 126 72.0 20
5.40 121 69.8 19
5.50 116 67.6 18
5.60 111 65.7 15
Scale
Scale Major Load (kg) Indenter Use of Scale
A 60 Diamond Cone Extremely hard material such as tungsten carbide or hard sheet material too thin for heavy load
B 100 1/16" ball Materials of B 0 - B 100 hardness
C 150 Diamond Cone Materials of C 20 - C 70 hardness
E 100 1/6" ball Very Soft Materials such as bearing metals
F 60 1/16" ball Very Soft Materials such as bearing metals
H 60 1/8" ball Very Soft Materials such as bearing metals
Superficial
15-N 15 Diamond Cone Materials of C 20 - C 70 hardness
15-T 15 1/16" ball Materials of B 0 - B 100 hardness
30-T 30 1/16" ball Materials of B 0 - B 100 hardness

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