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Hardness Conversions Scale

Brinell Hardness Rockwell Hardness Tensile Strength (Approximate)
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