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Home / Resources / Hardness Conversion Chart

Hardness Conversion Chart

Download

Approximate equivalent hardness numbers for carbon and alloy steels.

ROCKWELL ROCKWELL SUPERFICIAL Brinell Vickers Shore
A B C D E F 15-N 30-N 45-N 30-T 3000 kg 500 kg Sciero
60kg Brale 100kg Ball 150kg Brale 100kg Brale 100kg Ball 60kg Ball 15kg Brale 30kg Brale 45kg Brale 30 kg Ball Ball Steel Ball Steel -scope
1/16″ 1/8″ 1/16″ 1/16″ 10mm 10mm
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
80.7 – 59 69.9 – – 89.8 76.6 65.5 – 634 – 674 80
80.1 – 58 69.2 – – 89.3 75.7 64.3 – 615 – 653 78
79.6 – 57 68.5 – – 88.9 74.8 63.2 – 595 – 633 76
79 – 56 67.7 – – 88.3 73.9 62 – 577 – 613 75
78.5 120 55 66.9 – – 87.9 73 60.9 – 560 – 595 74
78 120 54 66.1 – – 87.4 72 59.8 – 543 – 577 72
77.4 119 53 65.4 – – 86.9 71.2 58.6 – 525 – 560 71
76.8 119 52 64.6 – – 86.4 70.2 57.4 – 500 – 544 69
76.3 118 51 63.8 – – 85.9 69.4 56.1 – 487 – 528 68
75.9 117 50 63.1 – – 85.5 68.5 55 – 475 – 513 67
75.2 117 49 62.1 – – 85 67.6 53.8 – 464 – 498 66
74.7 116 48 61.4 – – 84.5 66.7 52.5 – 451 – 484 64
74.1 116 47 60.8 – – 83.9 65.8 51.4 – 442 – 471 63
73.6 115 46 60 – – 83.5 64.8 50.3 – 432 – 458 62
73.1 115 45 59.2 – – 83 64 49 – 421 – 446 60
72.5 114 44 58.5 – – 82.5 63.1 47.8 – 409 – 434 58
72 113 43 57.7 – – 82 62.2 46.7 – 400 – 423 57
71.5 113 42 56.9 – – 81.5 61.3 45.5 – 390 – 412 56
70.9 112 41 56.2 – – 80.9 60.4 44.3 – 381 – 402 55
70.4 112 40 55.4 – – 80.4 59.5 43.1 – 371 – 392 54
69.9 111 39 54.6 – – 79.9 58.6 41.9 – 362 – 382 52
69.4 110 38 53.8 – – 79.4 57.7 40.8 – 353 – 372 51
68.9 110 37 53.1 – – 78.8 56.8 39.6 – 344 – 363 50
68.4 109 36 52.3 – – 78.3 55.9 38.4 – 336 – 354 49
67.9 109 35 51.5 – – 77.7 55 37.2 – 327 – 345 48
67.4 108 34 50.8 – – 77.2 54.2 36.1 – 319 – 336 47
66.8 108 33 50 – – 76.6 53.3 34.9 – 311 – 327 46
66.3 107 32 49.2 – – 76.1 52.1 33.7 – 301 – 318 44
65.8 106 31 48.4 – – 75.6 51.3 32.5 – 294 – 310 43
65.3 105 30 47.7 – – 75 50.4 31.3 – 286 – 302 42
64.7 104 29 47 – – 74.5 49.5 30.1 – 279 – 294 41
64.3 104 28 46.1 – – 73.9 48.6 28.9 – 271 – 286 41
63.8 103 27 45.2 – – 73.3 47.7 27.8 – 264 – 279 40
63.3 103 26 44.6 – – 72.8 46.8 26.7 – 258 – 272 39
62.8 102 25 43.8 – – 72.2 45.9 25.5 – 253 – 266 38
62.4 101 24 43.1 – – 71.6 45 24.3 – 247 – 260 37
62 100 23 42.1 – – 71 44 23.1 82 240 201 254 36
61.5 99 22 41.6 – – 70.5 43.2 22 81.5 234 195 248 35
61 98 21 40.9 – – 69.9 42.3 20.7 81 228 189 243 35
60.5 97 20 40.1 – – 69.4 41.5 19.6 80.5 222 184 238 34
59 96 18 – – – – – – 80 216 179 230 33
58 95 16 – – – – – – 79 210 175 222 32
57.5 94 15 – – – – – – 78.5 205 171 213 31
57 93 13 – – – – – – 78 200 167 208 30
56.5 92 12 – – – – – – 77.5 195 163 204 29
56 91 10 – – – – – – 77 190 160 196 28
55.5 90 9 – – – – – – 76 185 157 192 27
55 89 8 – – – – – – 75.5 180 154 188 26
54 88 7 – – – – – – 75 176 151 184 26
53.5 87 6 – – – – – – 74.5 172 148 180 26
53 86 5 – – – – – – 74 169 145 176 25
52.5 85 4 – – – – – – 73.5 165 142 173 25
52 84 3 – – – – – – 73 162 140 170 25
51 83 2 – – – – – – 72 159 137 166 24
50.5 82 1 – – – – – – 71.5 156 135 163 24
50 81 0 – – – – – – 71 153 133 160 24
49.5 80 – – – – – – – 70 150 130 – –
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 – –
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