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HARDNESS SCALE CONVERSION (Download PDF )


Rockwell
Brinell Vickers Sclero
scope

C
B A D F 15N 30N 45N 15T 30T 45T HBW30 HV
150kg diamd 100kg 1/16" ball 60kg diamd 100kg diamd 100kg 1/8" ball 15kg diamd 300kg diamd 45kg diamd 15kg 1/16" ball 30kg 1/16" ball 45kg 1/16" ball 3000kg
10 mm
ball
pyramid diamd
68 --- 85.6 76.9 --- 93.2 84.4 75.4 --- --- --- ... 940 97.3
67 --- 85.0 76.1 --- 92.9 83.6 74.2 --- --- --- ... 900 95.0
66 --- 84.5 75.4 --- 92.5 82.8 73.3 --- --- --- ... 865 92.7
65 --- 83.9 74.5 --- 92.2 81.9 72.0 --- --- --- 739 832 90.6
64 --- 83.4 73.8 --- 91.8 81.1 71.0 --- --- --- 722 800 88.5
63 --- 82.8 73.0 --- 91.4 80.1 69.9 --- --- --- 705 772 86.5
62 --- 82.3 72.2 --- 91.1 79.3 68.8 --- --- --- 688 746 84.5
61 --- 81.8 71.5 --- 90.7 78.4 67.7 --- --- --- 670 720 82.6
60 --- 81.2 70.7 --- 90.2 77.5 66.6 --- --- --- 654 697 80.8
59 --- 80.7 69.9 --- 89.8 76.6 65.5 --- --- --- 634 674 79.0
58 --- 80.1 69.2 --- 89.3 75.7 64.3 --- --- --- 615 653 77.3
57 --- 79.6 68.5 --- 88.9 74.8 63.2 --- --- --- 595 633 75.6
56 --- 79.0 67.7 --- 88.3 73.9 62.0 --- --- --- 577 613 74.0
55 --- 78.5 66.9 --- 87.9 73.0 60.9 --- --- --- 560 595 72.4
54 --- 78.0 66.1 --- 87.4 72.0 59.8 --- --- --- 543 577 70.9
53 --- 77.4 65.4 --- 86.9 71.2 58.6 --- --- --- 525 560 69.4
52 --- 76.8 64.6 --- 86.4 70.2 57.4 --- --- --- 512 544 67.9
51 --- 76.3 63.8 --- 85.9 69.4 56.1 --- --- --- 496 528 66.5
50 --- 75.9 63.1 --- 85.5 68.5 55.0 --- --- --- 481 513 65.1
49 --- 75.2 62.1 --- 85.0 67.6 53.8 --- --- --- 469 498 63.7
48 --- 74.7 61.4 --- 84.5 66.7 52.5 --- --- --- 455 484 62.4
47 --- 74.1 60.8 --- 83.9 65.8 51.4 --- --- --- 443 471 61.1
46 --- 73.6 60.0 --- 83.5 64.8 50.3 --- --- --- 432 458 59.8
45 --- 73.1 59.2 --- 83.0 64.0 49.0 --- --- --- 421 446 58.5
44 --- 72.5 58.5 --- 82.5 63.1 47.8 --- --- --- 409 434 57.3
43 --- 72.0 57.7 --- 82.0 62.2 46.7 --- --- --- 400 423 56.1
42 --- 71.5 56.9 --- 81.5 61.3 45.5 --- --- --- 390 412 54.9
41 --- 70.9 56.2 --- 80.9 60.4 44.3 --- --- --- 381 402 53.7
40 --- 70.4 55.4 --- 80.4 59.5 43.1 --- --- --- 371 392 52.6
39 --- 69.9 54.6 --- 79.9 58.6 41.9 --- --- --- 362 382 51.5
38 --- 69.4 53.8 --- 79.4 57.7 40.8 --- --- --- 353 372 50.4
37 --- 68.9 53.1 --- 78.8 56.8 39.6 --- --- --- 344 363 49.3
36 --- 68.4 52.3 --- 78.3 55.9 38.4 --- --- --- 336 354 48.2
35 --- 67.9 51.5 --- 77.7 55.0 37.2 --- --- --- 327 345 47.1
34 --- 67.4 50.8 --- 77.2 54.2 36.1 --- --- --- 319 336 46.1
33 --- 66.8 50.0 --- 76.6 53.3 34.9 --- --- --- 311 327 45.1
32 --- 66.3 49.2 --- 76.1 52.1 33.7 --- --- --- 301 318 44.1
31 --- 65.8 48.4 --- 75.6 51.3 32.5 --- --- --- 294 310 43.1
30 --- 65.3 47.7 --- 75.0 50.4 31.3 --- --- --- 286 302 42.2
29 --- 64.8 47.0 --- 74.5 49.5 30.1 --- --- --- 279 294 41.3
28 --- 64.3 46.1 --- 73.9 48.6 28.9 --- --- --- 271 286 40.4
27 --- 63.8 45.2 --- 73.3 47.7 27.8 --- --- --- 264 279 39.5
26 --- 63.3 44.6 --- 72.8 46.8 26.7 --- --- --- 258 272 38.7
25 --- 62.8 43.8 --- 72.2 45.9 25.5 --- --- --- 253 266 37.8
24 --- 62.4 43.1 --- 71.6 45.0 24.3 --- --- --- 247 260 37.0
23 --- 62.0 42.1 --- 71.0 44.0 23.1 --- --- --- 243 254 36.3
22 100 61.5/61.5 41.6 ... 70.5 43.2 22.0 93.1 83.1 72.9 237/240 248/240 35.5
21 99 61.0/60.9 40.9 ... 69.9 42.3 20.7 92.8 82.5 71.9 231/234 243/234 34.8
20 98 60.5/60.2 40.1 ... 69.4 41.5 19.6 92.5 81.8 70.9 226/228 238/228 34.2
--- 97 59.5 --- ... 92.1 81.1 69.9 222 222 ---
--- 96 58.9 --- ... 91.8 80.4 68.9 216 216 ---
--- 95 58.3 --- ... --- --- --- 91.5 79.8 67.9 210 210 ---
--- 94 57.6 --- ... --- --- --- 91.2 79.1 66.9 205 205 ---
--- 93 57.0 --- ... --- --- --- 90.8 78.4 65.9 200 200 ---
--- 92 56.4 --- ... --- --- --- 90.5 77.8 64.8 195 195 ---
--- 91 55.8 --- ... --- --- --- 90.2 77.1 63.8 190 190 ---
--- 90 55.2 --- ... --- --- --- 89.9 76.4 62.8 185 185 ---
--- 89 54.6 --- ... --- --- --- 89.5 75.8 61.8 180 180 ---
--- 88 54.0 --- ... --- --- --- 89.2 75.1 60.8 176 176 ---
--- 87 53.4 --- ... --- --- --- 88.9 74.4 59.8 172 172 ---
--- 86 52.8 --- ... --- --- --- 88.6 73.8 58.8 169 169 ---
--- 85 52.3 --- ... --- --- --- 88.2 73.1 57.8 165 165 ---
--- 84 51.7 --- ... --- --- --- 87.9 72.4 56.8 162 162 ---
--- 83 51.1 --- ... --- --- --- 87.6 71.8 55.8 159 159 ---
--- 82 50.6 --- ... --- --- --- 87.3 71.1 54.8 156 156 ---
--- 81 50.0 --- ... --- --- --- 86.9 70.4 53.8 153 153 ---
--- 80 49.5 --- ... --- --- --- 86.6 69.7 52.8 150 150 ---
--- 79 48.9 --- ... --- --- --- 86.3 69.1 51.8 147 147 ---
--- 78 48.4 --- ... --- --- --- 86 68.4 50.8 144 144 ---
--- 77 47.9 --- ... --- --- --- 85.6 67.7 49.8 141 141 ---
--- 76 47.3 --- ... --- --- --- 85.3 67.1 48.8 139 139 ---
--- 75 46.8 --- 99.6 --- --- --- 85 66.4 47.8 137 137 ---
--- 74 46.3 --- 99.1 --- --- --- 84.7 65.7 46.8 135 135 ---
--- 73 45.8 --- 98.5 --- --- --- 84.3 65.1 45.8 132 132 ---
--- 72 45.3 --- 98 --- --- --- 84 64.4 44.8 130 130 ---
--- 71 44.8 --- 97.4 --- --- --- 83.7 63.7 43.8 127 127 ---
--- 70 44.3 --- 96.8 --- --- --- 83.4 63.1 42.8 125 125 ---
--- 69 43.8 --- 96.2 --- --- --- 83 62.4 41.8 123 123 ---
--- 68 43.3 --- 95.6 --- --- --- 82.7 61.7 40.8 121 121 ---
--- 67 42.8 --- 95.1 --- --- --- 82.4 61 39.8 119 119 ---
--- 66 42.3 --- 94.5 --- --- --- 82.1 60.4 38.7 117 117 ---
--- 65 41.8 --- 93.9 --- --- --- 81.8 59.7 37.7 116 116 ---
--- 64 41.4 --- 93.4 --- --- --- 81.4 59 36.7 114 114 ---
--- 63 40.9 --- 92.8 --- --- --- 81.1 58.4 35.7 112 112 ---
--- 62 40.4 --- 92.2 --- --- --- 80.8 57.7 34.7 110 110 ---
--- 61 40.0 --- 91.7 --- --- --- 80.5 57 33.7 108 108 ---
--- 60 39.5 --- 91.1 --- --- --- 80.1 56.4 32.7 107 107 ---
--- 59 39.0 --- 90.5 --- --- --- 79.8 55.7 31.7 106 106 ---
--- 58 38.6 --- 90 --- --- --- 79.5 55 30.7 104 104 ---
--- 57 38.1 --- 89.4 --- --- --- 79.2 54.4 29.7 103 103 ---
--- 56 37.7 --- 88.8 --- --- --- 78.8 53.7 28.7 101 101 ---
--- 55 37.2 --- 88.2 --- --- --- 78.5 53 27.7 100 100 ---
--- 54 36.8 --- 87.7 --- --- --- 78.2 52.4 26.7 --- --- ---
--- 53 36.3 --- 87.1 --- --- --- 77.9 51.7 25.7 --- --- ---
--- 52 35.9 --- 86.5 --- --- --- 77.5 51 24.7 --- --- ---
--- 51 35.5 --- 86 --- --- --- 77.2 50.3 23.7 --- --- ---
--- 50 35.0 --- 85.4 --- --- --- 76.9 49.7 22.7 --- --- ---
--- 49 34.6 --- 84.8 --- --- --- 76.6 49 21.7 --- --- ---
--- 48 34.1 --- 84.3 --- --- --- 76.2 48.3 20.7 --- --- ---
--- 47 33.7 --- 83.7 --- --- --- 75.9 47.7 19.7 --- --- ---
--- 46 33.3 --- 83.1 --- --- --- 75.6 47 18.7 --- --- ---
--- 45 32.9 --- 82.6 --- --- --- 75.3 46.3 17.7 --- --- ---
--- 44 32.4 --- 82 --- --- --- 74.9 45.7 16.7 --- --- ---
--- 43 32.0 --- 81.4 --- --- --- 74.6 45 15.7 --- --- ---
--- 42 31.6 --- 80.8 --- --- --- 74.3 44.3 14.7 --- --- ---
--- 41 31.2 --- 80.3 --- --- --- 74 43.7 13.6 --- --- ---
--- 40 30.7 --- 79.7 --- --- --- 73.6 43 12.6 --- --- ---
--- 39 30.3 --- 79.1 --- --- --- 73.3 42.3 11.6 --- --- ---
--- 38 29.9 --- 78.6 --- --- --- 73 41.6 10.6 --- --- ---
--- 37 29.5 --- 78 --- --- --- 72.7 41 9.6 --- --- ---
--- 36 29.1 --- 77.4 --- --- --- 72.3 40.3 8.6 --- --- ---
--- 35 28.7 --- 76.9 --- --- --- 72 39.6 7.6 --- --- ---
--- 34 28.2 --- 76.3 --- --- --- 71.7 39 6.6 --- --- ---
--- 33 27.8 --- 75.7 --- --- --- 71.4 38.3 5.6 --- --- ---
--- 32 27.4 --- 75.2 --- --- --- 71 37.6 4.6 --- --- ---
--- 31 27.0 --- 74.6 --- --- --- 70.7 37 3.6 --- --- ---
--- 30 26.6 --- 74 --- --- --- 70.4 36.3 2.6 --- --- ---


Rockwell Hardness Chart (plus a PDF)
(aka Hardness Scale Conversion Chart)

Round Correction Factor
Hardness Minimum Thickness

ASTM Hardness Test Methods
Rockwell Hardness Scales

Brinell Hardness Chart (plus a PDF)

Rockwell Hardness Testing
Brinell Hardness Testing
Microhardness Testing


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