Hardness Conversion Table
Hardness Conversion per ASTM E-140, Strength per ASTM A370, See bottom half of table.
Download Hardness Conversion Table (PDF)
| Brinell Hardness HB 10/3000/15 | Rockwell Hardness | Superficial Hardness | Approx Tensile | |||||
|---|---|---|---|---|---|---|---|---|
| Dia (mm) | HB | A 60kg |
B 100kg |
C 150kg |
15T 15kg |
30T 30kg |
45T 45kg |
(KSI) |
| 3.90 | 241 | 62 | 100 | 23 | 93 | 83 | 73 | 116 |
| 3.95 | 235 | 61.5 | 99 | 22 | 93 | 82.5 | 72 | 114 |
| 4.00 | 229 | 61 | 98 | 20.5 | 92.5 | 82 | 71 | 109 |
| 4.05 | 223 | 60 | 97 | 19.5 | 92 | 81 | 70 | 104 |
| 4.10 | 217 | 59 | 96 | -- | 92 | 80.5 | 69 | 102 |
| 4.15 | 212 | 58 | 95 | -- | 91.5 | 80 | 68 | 100 |
| 4.20 | 207 | 57.5 | 94 | -- | 91 | 79 | 67 | 98 |
| 4.25 | 201 | 57 | 93 | -- | 91 | 78.5 | 66 | 94 |
| 4.30 | 197 | 56.5 | 92 | -- | 90.5 | 78 | 65 | 92 |
| 4.35 | 192 | 56 | 91 | -- | 90 | 77 | 64 | 90 |
| 4.40 | 187 | 55 | 90 | -- | 90 | 76.5 | 63 | 89 |
| 4.45 | 183 | 55 | 89.5 | -- | 90 | 76 | 62.5 | 89 |
| 4.50 | 179 | 54.5 | 89 | -- | 89.5 | 76 | 62 | 88 |
| 4.55 | 174 | 53.5 | 87.5 | -- | 89 | 75 | 60 | 85 |
| 4.85 | 152 | 50 | 81 | -- | 87 | 70.5 | 54 | 73 |
| 4.90 | 149 | 49.5 | 80 | -- | 86.5 | 70 | 53 | 72 |
| 4.95 | 146 | 49 | 79 | -- | 86 | 69 | 52 | 70 |
| 5.00 | 143 | 48.5 | 78 | -- | 86 | 68.5 | 51 | 69 |
| 5.05 | 140 | 47.5 | 76.5 | -- | 85.5 | 67.5 | 49.5 | 68 |
| 5.10 | 137 | 47 | 75 | -- | 85 | 66.5 | 48 | 66 |
| 5.15 | 134 | 46 | 74 | -- | 84.5 | 66 | 47 | 65 |
| 5.20 | 131 | 46 | 73 | -- | 84 | 65 | 46 | 64 |
| 5.25 | 128 | 45 | 71.5 | -- | 84 | 64 | 44 | 63 |
| 5.30 | 126 | 44.5 | 70.5 | -- | 83.5 | 63.5 | 43.5 | 61 |
| 5.35 | 123 | 44 | 69 | -- | 83 | 62.5 | 42 | 60 |
| 5.40 | 121 | 43 | 68 | -- | 83 | 62 | 41 | 59 |
| 5.45 | 118 | 43 | 67 | -- | 82.5 | 61 | 40 | 58 |
| 5.50 | 116 | 42 | 65 | -- | 82 | 60 | 38 | 56 |
| 5.55 | 114 | 41.5 | 64 | -- | 81.5 | 59 | 37 | -- |
| Brinell Hardness HB 10/3000/15 | Rockwell Hardness | Superficial Hardness | Approx Tensile | |||||
| Dia (mm) | HB | A 60kg |
B 100kg |
C 150kg |
15T 15kg |
30T 30kg |
45T 45kg |
(KSI) |
| -- | -- | 86 | -- | 68 | 93 | 84 | 75 | -- |
| -- | -- | 85 | -- | 67 | 93 | 84 | 74 | -- |
| -- | -- | 84.5 | -- | 66 | 92.5 | 83 | 73 | -- |
| -- | -- | 84 | -- | 56 | 92 | 82 | 72 | -- |
| -- | -- | 83.5 | -- | 64 | 92 | 81 | 71 | -- |
| -- | -- | 83 | -- | 63 | 91.5 | 80 | 70 | -- |
| -- | -- | 82 | -- | 62 | 91 | 79.5 | 69 | -- |
| -- | -- | 81 | -- | 60 | 90 | 77.5 | 67 | -- |
| -- | -- | 80.5 | -- | 58.5 | 89.5 | 76 | 65 | 345 |
| 2.50 | 601 | 80 | -- | 57 | 89 | 75 | 63 | 325 |
| 2.55 | 578 | 79 | -- | 56 | 88 | 74 | 62 | 313 |
| 2.60 | 555 | 78.5 | -- | 55 | 88 | 73 | 61 | 301 |
| 2.65 | 534 | 78 | -- | 53.5 | 87 | 71.5 | 59 | 287 |
| 2.70 | 514 | 77 | -- | 52 | 86.5 | 70 | 57.6 | 273 |
| 2.75 | 495 | 76 | -- | 51 | 86 | 69.5 | 56 | 264 |
| 2.80 | 477 | 75.5 | -- | 49.5 | 85.5 | 68 | 54.5 | 252 |
| 2.85 | 461 | 75 | -- | 48.5 | 85 | 67 | 53 | 241 |
| 2.90 | 444 | 74 | -- | 47 | 84 | 66 | 51.5 | 229 |
| 2.95 | 429 | 73.5 | -- | 45.5 | 83.5 | 64.5 | 50 | 220 |
| 3.00 | 415 | 73 | -- | 44.5 | 83 | 63.5 | 48.5 | 210 |
| 3.05 | 401 | 72 | -- | 43 | 82 | 62 | 47 | 201 |
| 3.10 | 388 | 71.5 | -- | 41.5 | 81 | 61 | 45 | 193 |
| 3.15 | 375 | 70.5 | -- | 40.5 | 80.5 | 60 | 44 | 185 |
| 3.20 | 363 | 70 | -- | 39 | 80 | 59.5 | 42 | 177 |
| 3.25 | 352 | 69 | -- | 38 | 79.5 | 58 | 41 | 171 |
| 3.30 | 341 | 68.5 | -- | 36.5 | 78.5 | 56.5 | 39.5 | 165 |
| 3.35 | 331 | 68 | -- | 35.5 | 78 | 55.5 | 38 | 158 |
| 3.40 | 321 | 67.5 | -- | 34 | 77 | 54 | 36 | 152 |
| 3.45 | 311 | 67 | -- | 33 | 76.5 | 53 | 35 | 149 |
| 3.50 | 302 | 66.5 | -- | 32 | 76 | 52 | 34 | 146 |
| 3.55 | 293 | 66 | -- | 31 | 75.5 | 51 | 32.5 | 141 |
| 3.60 | 285 | 65 | -- | 30 | 75 | 50.5 | 31 | 138 |
| 3.65 | 277 | 64.5 | -- | 29 | 74.5 | 50 | 30 | 135 |
| 3.70 | 269 | 64 | -- | 28 | 74 | 48.5 | 29 | 131 |
| 3.75 | 262 | 63.5 | -- | 27 | 73.5 | 48 | 28 | 128 |
| 3.80 | 255 | 63 | -- | 25.5 | 72.5 | 46.5 | 26 | 124 |
| 3.85 | 248 | 62.5 | -- | 24 | 71.5 | 45 | 24.5 | 119 |