Hardness Conversion Chart

HARDENED STEEL & HARD ALLOYS

ROCKWELL STANDARDS

VICKERS
BRINELL
C
A
D
HV
BHN
150 KG
60 KG
100 KG
10 KG
3000 Kg

DIAMOND INDENTER

100 mm Ball

80
79
78
92.0
91.5
91.0
86.5
85.5
84.5
1865
1787
1710
N.A.
77
76
75
90.5
90.0
89.5
84.0
83.0
82.5
1633
1556
1478
N.A.
74
73
72
89.0
88.5
88.0
81.5
81.0
80.0
1400
1323
1245
N.A.
71
70
69
87.0
86.5
86.0
79.5
78.5
78.0
1160
1076
1004
N.A.
68
67
66
85.6
85.0
84.5
76.9
76.1
75.4
940
900
865
N.A.
65
64
63
83.9
83.4
82.8
74.5
73.8
73.0
832
800
772
739
722
706
62
61
60
82.3
81.8
81.2
72.2
71.5
70.7
746
720
697
688
670
654
59
58
57
80.7
80.1
79.6
69.9
69.2
68.5
674
653
633
634
615
595
56
55
54
79.0
78.5
78.0
67.7
66.9
66.1
613
595
577
577
560
543
53
52
51
77.4
76.8
76.3
65.4
64.6
63.8
560
544
528
525
512
496
50
49
48
75.9
75.2
74.7
63.1
62.1
61.4
513
498
484
481
469
455
47
46
45
74.1
73.6
73.1
60.8
60.0
59.2
471
458
446
443
432
421
44
43
42
72.5
72.0
71.5
58.5
57.7
56.9
434
423
412
409
400
390
41
40
39
70.9
70.4
69.9
56.2
55.4
54.6
402
392
382
381
371
362
38
37
36
69.4
68.9
68.4
53.8
53.1
52.3
372
363
354
353
344
336
35
34
33
67.9
67.4
66.8
51.5
50.8
50.0
345
336
327
327
319
311
32
31
30
66.3
65.8
65.3
49.2
48.4
47.7
318
310
302
301
294
286
29
28
27
64.6
64.3
63.8
47.0
46.1
45.2
294
286
279
279
271
264
26
25
24
63.3
62.8
62.4
44.6
43.8
43.1
272
266
260
258
253
247
23
22
21
62.0
61.5
61.0
42.1
41.6
40.9
254
248
243
243
237
231
20
60.5
40.1
238
226

Soft Steel, Grey & Malleable Cast Iron &  Most Non-Ferrous Metals

ROCKWELL
STANDARD

ROCKWELL STANDARD

BRINELL

BRINELL
VICKERS

 B  F  E  H  K  A  HB BHN
--------
HV 

 100kg
1/16" Ball

 60kg
1/16"Ball

100kg
1/8"Ball 
 60kg
1/8"Ball
 150kg
1/8"Ball
60kg
Diamond 
500kg
100mm Ball 
 3000kg 10mm
100
99
98
N.A.   N.A.  N.A. N.A.  61.5
60.9
60.2
201
195
189
240
234
228
97
96
95
 N.A.  N.A.  N.A.  N.A. 59.5
58.9
58.3
184
179
175
222
216
210
94
93
92
N.A.   N.A.  N.A.
 
100
57.6
57.0
56.4
171
167
163
205
200
195
91
90
89
 N.A.  N.A.  N.A. 99.5
98.5
98.0
55.8
55.2
54.6
160
157
154
190
185
180
88
87
86
 N.A. N.A.   N.A. 97.0
96.5
95.5
54.0
53.4
52.8
151
148
145
176
172
169
85
84
83
 N.A.  N.A.  N.A. 94.5
94.0
93.0
52.3
51.7
51.1
142
140
137
165
162
159
82
81
80
 N.A.  N.A. N.A.  92.0
91.0
90.5
50.6
50.0
49.5
135
133
130
156
153
150
79
78
77
 N.A.  N.A. N.A.  89.5
88.5
88.0
48.9
48.4
47.9
128
126
124
147
144
141
76
75
74

99.6
99.1
 N.A.  N.A. 87.0
86.0
85.0
47.3
46.8
46.3
122
120
118
139
137
135
73
72
71
98.5
98.0
97.4
--
--
100.00
 N.A. 84.5
83.5
82.5
45.8
45.3
44.8
116
114
112
132
130
127
70
69
68
96.8
96.2
95.6
99.5
99.0
98.0
 N.A. 81.5
81.0
80.0
44.3
43.8
43.3
110
109
107
125
132
121
67
66
65
95.1
94.5
93.9
97.5
97.0
96.0
 N.A. 79.0
78.5
77.5
42.8
42.3
41.8
106
104
102
119
117
116
64
63
62
93.4
92.8
92.8
95.5
95.0
94.5
 N.A. 76.0
74.5
74.0
41.4
40.9
40.4
101
99
98
114
112
110
61
60
59
91.7
91.1
90.5
93.5
93.0
92.5
 N.A. 74.0
73.0
72.0
40.0
39.5
39.0
96
95
94
108
107
106
58
57
56
90.0
89.4
88.8
92.0
91.0
90.5
 N.A. 71.0
70.5
69.5
38.7
38.1
37.7
 92
91
90
104
103
101
55
54
53
88.2
87.7
87.1
90.0
89.5
89.0
N.A. 68.5
68.0
67.0
37.2
36.8
36.3
89
87
86
N.A.
52
51
86.5
86.0
88.0
87.5
N.A. 66.0
65.0
35.9
35.5
85
84
N.A.
50
49
48
85.4
84.8
84.3
87.0
86.5
85.5
N.A. 64.5
63.5
62.5
35.0
34.6
34.1
83
82
81
N.A.
47
46
45
83.7
83.1
82.6
85.0
84.5
84.0
N.A. 61.5
61.0
60.0
33.7
33.3
32.9
80
80
79
N.A.
44
43
42
82.0
81.4
80.8
83.5
82.5
82.0
N.A. 59.0
58.0
57.5
32.4
32.0
31.6
78
77
76
N.A.
41
40
39
80.3
79.7
79.1
81.5
81.0
80.0
N.A. 56.5
55.5
54.5
31.2
30.7
30.3
75
75
74
N.A.
38
37
36
78.6
78.0
77.4
79.5
79.0
78.5
N.A. 54.0
53.0
52.0
29.9
29.5
29.1
73
72
72
N.A.
35
34
33
76.9
76.3
75.7
78.0
77.0
76.5
N.A. 51.5
50.5
49.5
28.7
28.2
27.8
71
70
69
N.A.
32
31
30
75.2
74.6
74.0
76.0
75.5
75.0
N.A. 48.5
48.0
47.0
27.4
27.0
26.6
69
68
67
N.A.
29
28
27
73.5
73.0
72.5
74.0
73.5
73.0
N.A. 46.0
45.0
44.5
26.0
25.5
25.0
66
66
65
N.A.
26
25
24
72.0
71.0
70.5
72.5
72.0
71.0
N.A. 43.5
42.5
41.5
24.5
24.3
24.0
65
64
64
N.A.
23
22
21
70.0
69.5
69.0
70.5
70.0
69.5
N.A. 41.0
40.0
39.0
23.5
23.0
22.5
63
62
62
N.A.
20
19
18
68.5
68.0
67.0
68.5
68.0
67.5
N.A. 38.0
37.5
36.5
22.0
21.5
21.3
61
61
60
N.A.
17
16
15
66.5
66.0
65.5
67.0
66.5
65.5
N.A. 35.5
35.0
34.0
21.0
20.5
20.0
60
59
59
N.A.
14
13
12
65.0
64.5
64.0
65.0
64.5
64.0
N.A. 33.0
32.0
31.5
 N.A. 59
58
58
N.A.
11
10
9
63.5
63.0
62.0
63.5
62.5
62.0
N.A. 30.5
29.5
29.0
 N.A. 57
57
57
N.A.
8
7
6
61.5
61.0
60.5
61.5
61.0
60.5
N.A. 28.0
27.0
26.0
 N.A. 56
56
55
N.A.
5
4
3
60.0
59.5
59.0
60.0
59.0
58.5
N.A. 25.5
24.5
23.5
 N.A. 55
54
54
N.A.
2
1
58.0
57.5
58.5
57.5
N.A. 23
22
N.A. 54
54
N.A.

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