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Hardness Conversion Chart
This hardness conversion chart provides approximate comparisons between common hardness scales, including Rockwell, Brinell, and Vickers. These values are intended for reference only and are commonly used in materials engineering, machining, quality control, and specification review.
Understanding Hardness Scales
Metal hardness is measured using different test methods depending on material type, thickness, and application. The most widely used scales include Rockwell, Brinell, and Vickers, each using different indenters and loads. Because test methods vary, hardness values cannot be converted with absolute precision.
| Brinell Hardness | Rockwell Hardness | Tensile Strength (Approx.) | ||
|---|---|---|---|---|
| Tungsten Carbide Ball 3000 KG | A Scale 60KG | B Scale 100KG | C Scale 150KG | |
| – | 85.6 | – | 68.0 | – |
| – | 85.3 | – | 67.5 | – |
| – | 85.0 | – | 67.0 | – |
| 767 | 84.7 | – | 66.4 | – |
| 757 | 84.4 | – | 65.9 | – |
| 745 | 84.1 | – | 65.3 | – |
| 733 | 83.8 | – | 64.7 | – |
| 722 | 83.4 | – | 64.0 | – |
| 712 | – | – | – | – |
| 710 | 83.0 | – | 63.3 | – |
| 698 | 82.6 | – | 62.5 | – |
| 684 | 82.2 | – | 61.8 | – |
| 682 | 82.2 | – | 61.7 | – |
| 670 | 81.8 | – | 61.0 | – |
| 656 | 81.3 | – | 60.1 | – |
| 653 | 81.2 | – | 60.0 | – |
| 647 | 81.1 | – | 59.7 | – |
| 638 | 80.8 | – | 59.2 | 329,000 |
| 630 | 80.6 | – | 58.8 | 324,000 |
| 627 | 80.5 | – | 58.7 | 323,000 |
| 601 | 79.8 | – | 57.3 | 309,000 |
| 578 | 79.1 | – | 56.0 | 297,000 |
| 555 | 78.4 | – | 54.7 | 285,000 |
| 534 | 77.8 | – | 53.5 | 274,000 |
| 514 | 76.9 | – | 52.1 | 263,000 |
| 495 | 76.3 | – | 51.0 | 253,000 |
| 477 | 75.6 | – | 49.6 | 243,000 |
| 461 | 74.9 | – | 48.5 | 235,000 |
| 444 | 74.2 | – | 47.1 | 225,000 |
| 429 | 73.4 | – | 45.7 | 217,000 |
| 415 | 72.8 | – | 44.5 | 210,000 |
| 401 | 72.0 | – | 43.1 | 202,000 |
| 388 | 71.4 | – | 41.8 | 195,000 |
| 375 | 70.6 | – | 40.4 | 188,000 |
| 363 | 70.0 | – | 39.1 | 182,000 |
| 352 | 69.3 | – | 37.9 | 176,000 |
| 341 | 68.7 | – | 36.6 | 170,000 |
| 331 | 68.1 | – | 35.5 | 166,000 |
| 321 | 67.5 | – | 34.3 | 160,000 |
| 311 | 66.9 | – | 33.1 | 155,000 |
| 302 | 66.3 | – | 32.1 | 150,000 |
| 293 | 65.7 | – | 30.9 | 145,000 |
| 285 | 65.3 | – | 29.9 | 141,000 |
| 277 | 64.6 | – | 28.8 | 137,000 |
| 269 | 64.1 | – | 27.6 | 133,000 |
| 262 | 63.6 | – | 26.6 | 129,000 |
| 255 | 63.0 | – | 25.4 | 126,000 |
| 248 | 62.5 | – | 24.2 | 122,000 |
| 241 | 61.8 | 100.0 | 22.8 | 118,000 |
| 235 | 61.4 | 99.0 | 21.7 | 115,000 |
| 229 | 60.8 | 98.2 | 20.5 | 111,000 |
| 223 | – | 97.3 | 20.0 | – |
| 217 | – | 96.4 | 18.0 | 105,000 |
| 212 | – | 95.5 | 17.0 | 102,000 |
| 207 | – | 94.6 | 16.0 | 100,000 |
| 201 | – | 93.8 | 15.0 | 98,000 |
| 197 | – | 92.8 | – | 95,000 |
| 192 | – | 91.9 | – | 93,000 |
| 187 | – | 90.7 | – | 90,000 |
| 183 | – | 90.0 | – | 89,000 |
| 179 | – | 89.0 | – | 87,000 |
| 174 | – | 87.8 | – | 85,000 |
| 170 | – | 86.8 | – | 83,000 |
| 167 | – | 86.0 | – | 81,000 |
| 163 | – | 85.0 | – | 79,000 |
| 156 | – | 82.9 | – | 76,000 |
| 149 | – | 80.8 | – | 73,000 |
| 143 | – | 78.7 | – | 71,000 |
| 137 | – | 76.4 | – | 67,000 |
| 131 | – | 74.0 | – | 65,000 |
| 126 | – | 72.0 | – | 63,000 |
| 121 | – | 69.8 | – | 60,000 |
| 116 | – | 67.6 | – | 58,000 |
| 111 | – | 65.7 | – | 56,000 |
**Hardness conversions are approximate. For critical applications, material testing to the applicable specification is recommended.
Common Uses for Hardness Conversion Charts
Hardness conversion charts are commonly used when comparing material specifications, reviewing supplier certifications, evaluating machinability, or estimating mechanical properties during design and manufacturing. They are especially useful when materials are specified using different hardness scales.
Hardness values can vary based on alloy composition, heat treatment, and testing method. Conversion charts should not be used as a substitute for certified test data when performance requirements are critical.
