| HARDNESS CONVERSION TABLE (Approximate Value) | |||||||
| Brinell | Rockwell | Tensile Strength | |||||
| Diameter 3000 Kg. Load 10 mm. Ball | Hardness No. | C | B | A | 15-N | Shore | Tensile Strength 1000 Lb./Sq. In. |
| 2.25 | 745 | 65.3 | — | 84.1 | 92.3 | 91 | — |
| 2.30 | 712 | — | — | — | — | — | — |
| 2.35 | 682 | 61.7 | — | 82.2 | 91.0 | 84 | — |
| 2.40 | 653 | 60.0 | — | 81.2 | 90.2 | 81 | — |
| 2.45 | 627 | 58.7 | — | 80.5 | 89.6 | 79 | — |
| 2.50 | 601 | 57.3 | — | 79.8 | 89.0 | 77 | — |
| 2.55 | 578 | 56.0 | — | 79.1 | 88.4 | 75 | — |
| 2.60 | 555 | 54.7 | — | 78.4 | 87.8 | 73 | 298 |
| 2.65 | 534 | 53.5 | — | 77.8 | 87.2 | 71 | 288 |
| 2.70 | 514 | 52.1 | — | 76.9 | 86.5 | 70 | 274 |
| 2.75 | 495 | 51.0 | — | 76.3 | 85.9 | 68 | 264 |
| 2.80 | 477 | 49.6 | — | 75.6 | 85.3 | 66 | 252 |
| 2.85 | 461 | 48.5 | — | 74.9 | 84.7 | 65 | 242 |
| 2.90 | 444 | 47.1 | — | 74.2 | 84.0 | 63 | 230 |
| 2.95 | 429 | 45.7 | — | 73.4 | 83.4 | 61 | 219 |
| 3.00 | 415 | 44.5 | — | 72.8 | 82.8 | 59 | 212 |
| 3.05 | 401 | 43.1 | — | 72.0 | 82.0 | 58 | 202 |
| 3.10 | 388 | 41.8 | — | 71.4 | 81.4 | 56 | 193 |
| 3.15 | 375 | 40.4 | — | 70.6 | 80.6 | 54 | 184 |
| 3.20 | 363 | 39.1 | — | 70.0 | 80.0 | 52 | 177 |
| 3.25 | 352 | 37.9 | (110.0) | 69.3 | 79.3 | 51 | 170 |
| 3.30 | 341 | 36.6 | (109.0) | 68.7 | 78.6 | 50 | 163 |
| 3.35 | 331 | 35.5 | (108.5) | 68.1 | 78.0 | 48 | 158 |
| 3.40 | 321 | 34.3 | (108.0) | 67.5 | 77.3 | 47 | 152 |
| 3.45 | 311 | 33.1 | (107.5) | 66.9 | 76.7 | 46 | 147 |
| 3.50 | 302 | 32.1 | (107.0) | 66.3 | 76.1 | 45 | 143 |
| 3.55 | 293 | 30.9 | (106.0) | 65.7 | 75.5 | 43 | 139 |
| 3.60 | 285 | 29.9 | (105.5) | 65.3 | 75.0 | — | 135 |
| 3.65 | 277 | 28.8 | (104.5) | 64.6 | 74.4 | 41 | 131 |
| 3.70 | 269 | 27.6 | (104.0) | 64.1 | 73.7 | 40 | 128 |
| 3.75 | 262 | 26.6 | (103.0) | 63.6 | 73.1 | 39 | 125 |
| 3.80 | 255 | 25.4 | (102.0) | 63.0 | 72.5 | 38 | 121 |
| 3.85 | 248 | 24.2 | (101.0) | 62.5 | 71.7 | 37 | 118 |
| 3.90 | 241 | 22.8 | 100.0 | 61.8 | 70.9 | 36 | 114 |
| 3.95 | 235 | 21.7 | 99.0 | 61.4 | 70.3 | 35 | 111 |
| 4.00 | 229 | 20.5 | 98.2 | 60.8 | 69.7 | 34 | 109 |
| 4.05 | 223 | (18.8) | 97.3 | — | — | — | 104 |
| 4.10 | 217 | (17.5) | 96.4 | — | — | 33 | 103 |
| 4.15 | 212 | (16.0) | 95.5 | — | — | — | 100 |
| 4.20 | 207 | (15.2) | 94.6 | — | — | 32 | 99 |
| 4.25 | 201 | (13.8) | 93.8 | — | — | 31 | 97 |
| 4.30 | 197 | (12.7) | 92.8 | — | — | 30 | 94 |
| 4.35 | 192 | (11.5) | 91.9 | — | — | 29 | 92 |
| 4.40 | 187 | (10.0) | 90.7 | — | — | — | 90 |
| 4.45 | 183 | (9.0) | 90.0 | — | — | 28 | 89 |
| 4.50 | 179 | (8.0) | 89.0 | — | — | 27 | 88 |
| 4.55 | 174 | (6.4) | 87.8 | — | — | — | 86 |
| 4.60 | 170 | (5.4) | 86.8 | — | — | 26 | 84 |
| 4.65 | 167 | (4.4) | 86.0 | — | — | — | 83 |
| 4.70 | 163 | (3.3) | 85.0 | — | — | 25 | 82 |
| 4.80 | 156 | (0.9) | 82.9 | — | — | — | 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 | — |
| Hardness values are from SAE-ASM-ASTM Committees on Hardness Conversions as printed in ASTME 140, Table 3. Tensile Strength values are from Federal Test Methods Standard No. 151A-method 241.2 dated Jan. 10 1961. | |||||||
