Hardness Conversion Chart
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1SALES •CALIBRATION •REPAIR
HARDNESS CONVERSION CHART
Tensile
Rockwell
Superficial
Vickers
Knoop
Brinell
Strength
C
A
D
G
15-N
30-N
45-N
HV
HK
HB
ksi
3000 kg
150 kg
60 kg
100 kg
150 kg
15 kg
30 kg
45 kg
Vickers
500 gm
10-mm
1000 psi
Brale
Brale
Brale
1/16" Ball
N Brale
N Brale
N Brale
10 kg
& over
Ball
80
92
86.5
96.5
92
87
1865
---
79
91.5
85.5
96.3
91.5
86.5
1787
---
78
91
84.5
N/A
96
91
85.5
1710
---
77
90.5
84
95.8
90.5
84.5
1633
---
76
90
83
95.5
90
83.5
1556
---
75
89.5
82.5
95.3
89
82.5
1478
---
74
89
81.5
95
88.5
81.5
1400
---
73
88.5
81
94.8
88
80.5
1323
---
72
88
80
94.5
87
79.5
1245
---
71
87
79.5
94.3
86.5
78.5
1160
---
70
86.5
78.5
94
86
77.5
1076
972
69
86
78
93.5
85
76.5
1004
946
68
85.6
76.9
93.2
84.4
75.4
940
920
67
85
76.1
92.9
83.6
74.2
900
895
66
84.5
75.4
92.5
82.8
73.3
865
870
N/A
65
83.9
74.5
92.2
81.9
72
832
846
739
64
83.4
73.8
91.8
81.1
71
800
822
722
63
82.8
73
91.4
80.1
69.9
772
799
706
62
82.3
72.2
91.1
79.3
68.8
746
776
688
61
81.8
71.5
90.7
78.4
67.7
720
754
670
60
81.2
70.7
N/A
90.2
77.5
66.6
697
732
654
N/A
59
80.7
69.9
351
89.8
76.6
65.5
674
710
634
351
58
80.1
69.2
338
89.3
75.7
64.3
653
690
615
338
57
79.6
68.5
325
88.9
74.8
63.2
633
670
595
325
56
79
67.7
313
88.3
73.9
62
613
650
577
313
55
78.5
66.9
301
87.9
73
60.9
595
630
560
301
54
78
66.1
292
87.4
72
59.8
577
612
543
292
53
77.4
65.4
283
86.9
71.2
58.8
560
594
525
283
52
76.8
64.6
273
86.4
70.2
57.4
544
576
512
273
51
76.3
63.8
264
85.9
69.4
56.1
528
558
496
264
50
75.9
63.1
255
85.5
68.5
55
513
542
481
255
49
75.2
62.1
246
85
67.6
53.8
498
526
469
246
48
74.7
61.4
N/A
84.5
66.7
52.5
484
510
455
238
47
74.1
60.8
229
83.9
65.8
51.4
471
495
443
229
46
73.6
60
221
83.5
64.8
50.3
458
480
432
221
45
73.1
59.2
215
83
64
49
446
466
421
215
44
72.5
58.5
208
82.5
63.1
47.8
434
452
409
208
43
72
57.7
201
82
62.2
46.7
423
438
400
201
42
71.5
56.9
194
81.5
61.3
45.5
412
426
390
194
41
70.9
56.2
188
80.9
60.4
44.3
402
414
381
188
40
70.4
55.4
182
80.4
59.5
43.1
392
402
371
182
39
69.9
54.6
177
79.9
58.6
41.9
382
391
362
177
38
69.4
53.8
171
79.4
57.7
40.8
372
380
353
171
37
68.9
53.1
166
78.8
56.8
39.6
363
370
344
166
36
68.4
52.3
161
78.3
55.9
38.4
354
360
336
161
35
67.9
51.5
156
77.7
55
37.2
345
351
327
156
34
67.4
50.8
152
77.2
54.2
36.1
336
342
319
152
33
66.8
50
149
76.6
53.3
34.9
327
334
311
149
32
66.3
49.2
146
76.1
52.1
33.7
318
326
301
146
31
65.8
48.4
N/A
75.6
51.3
32.5
310
318
294
141
30
65.3
47.7
92
75
50.4
31.3
302
311
286
138
29
64.6
47
91
74.5
49.5
30.1
294
304
279
135
28
64.3
46.1
90
73.9
48.6
28.9
286
297
271
131
27
63.8
45.2
89
73.3
47.7
27.8
279
290
264
128
26
63.3
44.6
88
72.8
46.8
26.7
272
284
258
125
25
62.8
43.8
87
72.2
45.9
25.5
266
278
253
123
24
62.4
43.1
86
71.6
45
24.3
260
272
247
119
23
62
42.1
84.5
71
44
23.1
254
266
243
117
22
61.5
41.6
83.5
70.5
43.2
22
248
261
237
115
21
61
40.9
82.5
69.9
42.3
20.7
243
256
231
112
20
60.5
40.1
81
69.4
41.5
19.6
238
251
226
110
NOTE #1: A 10mm steel ball was used for 450 BHN and below; a 10mm carbide ball was used above 450 BHN.
NOTE #2: The tensile strength relation to hardness is inexact, even for steel unless it is determined for a specific material.
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