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.