BRINELL / ROCKWELL / TENSILE Brinell Rockwell C Rockwell B Rockwell A Tensile (ksi) 745 65.3 - 84.1 - 712 - - - - 682 61.7 - 82.2 - 653 60.0 - 81.2 - 627 58.7 - 80.5 - 601 57.3 - 79.8 - 578 56.0 - 79.1 - 555 54.7 - 78.4 298 534 53.5 - 77.8 288 514 52.1 - 76.9 274 495 51.0 - 76.3 264 477 49.6 - 75.6 252 461 48.5 - 74.9 242 444 47.1 - 74.2 230 429 45.7 - 73.4 219 415 44.5 - 72.8 212 401 43.1 - 72.0 202 388 41.8 - 71.4 193 375 40.4 - 70.6 184 363 39.1 - 70.0 177 352 37.9 - 69.3 170 341 36.6 - 68.7 163 331 35.5 - 68.1 158 321 34.3 - 76.5 152 311 33.1 - 66.9 147 302 32.1 - 66.3 143 293 30.9 - 65.7 139 285 29.9 - 65.3 135 277 28.8 - 64.6 131 269 27.6 - 64.1 128 262 26.6 - 63.6 125 255 25.4 - 63.0 121 248 24.2 - 62.5 118 241 22.8 100.0 61.8 114 235 21.7 99.0 61.4 111 229 20.5 98.2 60.8 109 223 - 97.3 - 104 217 - 96.4 - 103 212 - 95.5 - 100 207 - 94.6 - 99 201 - 93.8 - 97 197 - 92.8 - 94 192 - 91.9 - 92 187 - 90.7 - 90 183 - 90.0 - 89 179 - 89.0 - 88 174 - 87.8 - 86 170 - 86.8 - 84 167 - 86.0 - 83 163 - 85.0 - 82 156 - 82.9 - 80 149 - 80.8 - - 143 - 78.7 - - 137 - 76.4 - - 131 - 74.0 - - 126 - 72.0 - - 121 - 69.8 - - 116 - 67.6 - - 111 - 65.7 - -