Hardness Conversion Chart

Rockwell
Rockwell Superficial
Brinell
Vickers
Shore
Approx Tensile Strength (psi)
A B C D E F 15-N 30-N 45-N 30-T 3000 kg 500 kg 136
60kg Brale 100kg 1/16″ Ball 150kg Brale 100kg Brale 100kg 1/8″ Ball 60kg 1/16″ Ball 15kg Brale 30kg Brale 45kg Brale 30 kg 1/16″ Ball 10mm Ball Steel 10mm Ball Steel Diamond Pyramid Sciero-scope
86.5 70 78.5 94 86 77.6 1076 101
86 69 77.7 93.5 85 76.5 1044 99
85.6 68 76.9 93.2 84.4 75.4 940 97
85 67 76.1 92.9 83.6 74.2 900 95
84.5 66 75.4 92.5 82.8 73.2 865 92
83.9 65 74.5 92.2 81.9 72 739 832 91
83.4 64 73.8 91.8 81.1 71 722 800 88
82.8 63 73 91.4 80.1 69.9 705 772 87
82.3 62 72.2 91.1 79.3 68.8 688 746 85
81.8 61 71.5 90.7 78.4 67.7 670 720 83
81.2 60 70.7 90.2 77.5 66.6 654 697 81 320,000
80.7 59 69.9 89.8 76.6 65.5 634 674 80 310,000
80.1 58 69.2 89.3 75.7 64.3 615 653 78 300,000
79.6 57 68.5 88.9 74.8 63.2 595 633 76 290,000
79 56 67.7 88.3 73.9 62 577 613 75 282,000
78.5 120 55 66.9 87.9 73 60.9 560 595 74 274,000
78 120 54 66.1 87.4 72 59.8 543 577 72 266,000
77.4 119 53 65.4 86.9 71.2 58.6 525 560 71 257,000
76.8 119 52 64.6 86.4 70.2 57.4 500 544 69 245,000
76.3 118 51 63.8 85.9 69.4 56.1 487 528 68 239,000
75.9 117 50 63.1 85.5 68.5 55 475 513 67 233,000
75.2 117 49 62.1 85 67.6 53.8 464 498 66 227,000
74.7 116 48 61.4 84.5 66.7 52.5 451 484 64 221,000
74.1 116 47 60.8 83.9 65.8 51.4 442 471 63 217,000
73.6 115 46 60 83.5 64.8 50.3 432 458 62 212,000
73.1 115 45 59.2 83 64 49 421 446 60 206,000
72.5 114 44 58.5 82.5 63.1 47.8 409 434 58 200,000
72 113 43 57.7 82 62.2 46.7 400 423 57 196,000
71.5 113 42 56.9 81.5 61.3 45.5 390 412 56 191,000
70.9 112 41 56.2 80.9 60.4 44.3 381 402 55 187,000
70.4 112 40 55.4 80.4 59.5 43.1 371 392 54 182,000
69.9 111 39 54.6 79.9 58.6 41.9 362 382 52 177,000
69.4 110 38 53.8 79.4 57.7 40.8 353 372 51 173,000
68.9 110 37 53.1 78.8 56.8 39.6 344 363 50 169,000
68.4 109 36 52.3 78.3 55.9 38.4 336 354 49 165,000
67.9 109 35 51.5 77.7 55 37.2 327 345 48 160,000
67.4 108 34 50.8 77.2 54.2 36.1 319 336 47 156,000
66.8 108 33 50 76.6 53.3 34.9 311 327 46 152,000
66.3 107 32 49.2 76.1 52.1 33.7 301 318 44 147,000
65.8 106 31 48.4 75.6 51.3 32.5 294 310 43 144,000
65.3 105 30 47.7 75 50.4 31.3 286 302 42 140,000
64.7 104 29 47 74.5 49.5 30.1 279 294 41 137,000
64.3 104 28 46.1 73.9 48.6 28.9 271 286 41 133,000
63.8 103 27 45.2 73.3 47.7 27.8 264 279 40 129,000
63.3 103 26 44.6 72.8 46.8 26.7 258 272 39 126,000
62.8 102 25 43.8 72.2 45.9 25.5 253 266 38 124,000
62.4 101 24 43.1 71.6 45 24.3 247 260 37 121,000
62 100 23 42.1 71 44 23.1 82 240 201 254 36 118,000
61.5 99 22 41.6 70.5 43.2 22 81.5 234 195 248 35 115,000
61 98 21 40.9 69.9 42.3 20.7 81 228 189 243 35 112,000
60.5 97 20 40.1 69.4 41.5 19.6 80.5 222 184 238 34 109,000
59 96 18 80 216 179 230 33 106,000
58 95 16 79 210 175 222 32 103,000
57.5 94 15 78.5 205 171 213 31 100,000
57 93 13 78 200 167 208 30 98,000
56.5 92 12 77.5 195 163 204 29 96,000
56 91 10 77 190 160 196 28 93,000
55.5 90 9 76 185 157 192 27 91,000
55 89 8 75.5 180 154 188 26 88,000
54 88 7 75 176 151 184 26 86,000
53.5 87 6 74.5 172 148 180 26 84,000
53 86 5 74 169 145 176 25 83,000
52.5 85 4 73.5 165 142 173 25 81,000
52 84 3 73 162 140 170 25 79,000
51 83 2 72 159 137 166 24 78,000
50.5 82 1 71.5 156 135 163 24 76,000
50 81 0 71 153 133 160 24 75,000
49.5 80 70 150 130 73,000
49 79 69.5 147 128
48.5 78 69 144 126
48 77 68 141 124
47 76 67.5 139 122
46.5 75 99.5 67 137 120
46 74 99 66 135 118
45.5 73 98.5 65.5 132 116
45 72 98 65 130 114
44.5 71 100 97.5 64.2 127 112
44 70 99.5 97 63.5 125 110
43.5 69 99 96 62.8 123 109
43 68 98 95.5 62 121 107
42.5 67 97.5 95 61.4 119 106
42 66 97 94.5 60.5 117 104
41.8 65 96 94 60.1 116 102
41.5 64 95.5 93.5 59.5 114 101
41 63 95 93 58.7 112 99
40.5 62 94.5 92 58 110 98
40 61 93.5 91.5 57.3 108 96
39.5 60 93 91 56.5 107 95
39 59 92.5 90.5 55.9 106 94
38.5 58 92 90 55 104 92
38 57 91 89.5 54.6 102 91
37.8 56 90.5 89 54 101 90
37.5 55 90 88 53.2 99 89
37 54 89.5 87.5 52.5 87
36.5 53 89 87 51.8 86
36 52 88 86.5 51 85
35.5 51 87.5 86 50.4 84
35 50 87 85.5 49.5 83
34.8 49 86.5 85 49.1 82
34.5 48 85.5 84.5 48.5 81
34 47 85 84 47.7 80
33.5 46 84.5 83 47 79
33 45 84 82.5 46.2 79
32.5 44 83.5 82 45.5 78
32 43 82.5 81.5 44.8 77
31.5 42 82 81 44 76
31 41 81.5 80.5 43.4 75
30.8 40 81 79.5 43 74
30.5 39 80 79 42.1 74
30 38 79.5 78.5 41.5 73
29.5 37 79 78 40.7 72
29 36 78.5 77.5 40 71
28.5 35 78 77 39.3 71
28 34 77 76.5 38.5 70
27.8 33 76.5 75.5 37.9 69
27.5 32 76 75 37.5 68
27 31 75.5 74.5 36.6 68
26.5 30 75 74 36 67
26 29 74 73.5 35.2 66
25.5 28 73.5 73 34.5 66
25 27 73 72.5 33.8 65
24.5 26 72.5 72 33.1 65
24.2 25 72 71 32.4 64
24 24 71 70.5 32 64
23.5 23 70.5 70 31.1 63
23 22 70 69.5 30.4 63
22.5 21 69.5 69 29.7 62
22 20 68.5 68.5 29 62
21.5 19 68 68 28.1 61
21.2 18 67.5 67 27.4 61
21 17 67 66.5 26.7 60
20.5 16 66.5 66 26 60
20 15 65.5 65.5 25.3 59
14 65 65 24.6 59
13 64.5 64.5 23.9 58
12 64 64 23.5 58
11 63.5 63.5 22.6 57
10 62.5 63 21.9 57
9 62 62 21.2 56
8 61.5 61.5 20.5 56
7 61 61 19.8 56
6 60.5 60.5 19.1 55
5 60 60 18.4 55
4 59 59.5 18 55
3 58.5 59 17.1 54
2 58 58 16.4 54
1 57.5 57.5 15.7 53
0 57 57 15 53