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1850 Chapman Street  |  Pittsburgh, PA 15215-2791  |  (412) 781-8053  |  Fax (412) 781-8185  |  Email: pmpheat@aol.com

HARDNESS CONVERSION NUMBERS FOR STEEL

BRINELL ROCKWELL

TENSILE STRENGTH (Approximate) in 1000 PSI

DIAMOND PYRAMID HARDNESS NUMBERS SHORE HARDNESS NUMBER
Indentation Diameter, mm Tungsten
Carbide Ball
BHN
PITTSBURGH METAL PROCESSING CO.
Industrial Heat Treating
C-Scale B Scale A Scale 15N Scale
-   68.0 - 85.6 93.2 - 940 97
- - 67.0 - 85.0 92.9 - 900 95
- 757 65.9 - 84.4 92.9 - 860 92
2.25 745 65.3 - 84.1 92.5 - 840 91
- 722 64.0 - 83.4 92.3 - 800 88
2.30 712 - - - - - - -
- 710 63.3 - 83.0 91.5 - 780 87
2.35 682 61.7 - 82.2 91.0 - 737 84
- 670 61.0 - 81.8 90.7 - 720 83
2.40 653 60.0 - 81.2 90.2 - 697 81
2.45 627 58.7 - 80.5 89.6 323 667 79
2.50 601 57.3 - 79.8 89.0 309 640 77
2.55 578 56.0 - 79.1 88.4 297 615 75
2.60 555 54.7 - 78.4 87.8 285 591 73
2.65 534 53.5 - 77.8 87.2 274 569 71
2.70 514 52.1 - 76.9 86.5 263 547 70
2.75 495 51.0 - 76.3 85.9 253 528 68
2.80 477 49.6 - 75.6 85.3 243 508 66
2.85 461 48.5 - 74.9 84.7 235 491 65
2.90 444 47.1 - 74.2 84.0 225 472 63
2.95 429 45.7 - 73.4 83.4 217 455 61
3.00 415 44.5 - 72.8 82.8 210 440 59
3.05 401 43.1 - 72.0 82.0 202 425 58
3.10 388 41.8 - 71.4 81.4 195 410 56
3.15 375 40.4 - 70.6 80.6 188 396 54
3.20 363 39.1 - 70.0 80.0 182 383 52
3.25 352 37.9 110.0 69.3 79.3 176 372 51
3.30 341 36.6 109.0 68.7 78.6 170 360 50
3.35 331 35.5 108.5 68.1 78.0 166 350 48
3.40 321 34.3 108.0 67.5 77.3 160 339 47
3.45 311 33.1 107.5 66.9 76.7 155 328 46
3.50 302 32.1 107.0 66.3 76.1 150 319 45
3.55 293 30.9 106.0 65.7 75.5 145 309 43
3.60 285 29.9 105.5 65.3 75.0 141 301 -
3.65 277 28.8 104.5 64.6 74.4 137 292 41
3.70 269 27.6 104.0 64.1 73.7 133 284 40
3.75 262 26.6 103.0 63.6 73.1 129 276 39
3.80 255 25.4 102.0 63.0 72.5 126 269 38
3.85 248 24.2 101.0 62.5 71.7 122 261 37
3.90 241 22.8 100.0 61.8 70.9 118 253 36
3.95 235 21.7 99.0 61.4 70.3 115 247 35
4.00 229 20.5 98.2 60.8 69.7 111 241 34
4.05 223 18.8 97.3 - - - 234 -
4.10 217 17.5 96.4 - - 105 228 33
4.15 212 16.0 95.5 - - 102 222 -
4.20 207 15.2 94.6 - - 100 218 32
4.25 201 13.8 93.8 - - 98 212 31
4.30 197 12.7 92.8 - - 95 207 30
4.35 192 11.5 91.9 - - 93 202 29
4.40 187 10.0 90.7 - - 90 196 -
4.45 183 9.0 90.0 - - 89 192 28
4.50 179 8.0 89.0 - - 87 188 27
4.55 174 6.4 87.8 - - 85 182 -
4.60 170 5.4 86.8 - - 83 178 26
4.65 167 4.4 86.0 - - 81 175 -
4.70 163 3.3 85.0 - - 79 171 25
4.80 156 0.9 82.9 - - 76 163 -
4.90 149 - 80.8 - - 73 156 23
5.00 143 - 78.7 - - 71 150 22
5.10 137 - 76.4 - - 67 143 21
5.20 131 - 74.0 - - 65 137 -
5.30 126 - 72.0 - - 63 132 20
5.40 121 - 69.8 - - 60 127 19
5.50 116 - 67.6 - - 58 122 18
5.60 111 - 65.7 - - 56 117 15
(412) 781-8053   Fax: (412) 781-8185   Outside PA: (800) 323-7331
E-Mail pmpheat@aol.com   Webpage: http://www.pmpco.com

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Pittsburgh Metal Processing Co., Inc.

1850 Chapman Street  |  PO Box 7824  |  Pittsburgh, PA 15215-2791
In PA: (412) 781-8053
 |  Outside PA (800) 323-7331  |  Fax (412) 781-8185
Email: pmpheat@aol.com

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