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Handbook > Hardness Conversion Table |
|
ROCKWELL
|
SUPERFICIAL ROCKWELL
|
BRINELL
|
VICKERS OR
FIRTH DIAMOND HARDNESS NUMBER |
SCLERO-
SCOPE |
TENSILE
STRENGTH |
| 10 m/m Ball |
| Diamond
Brale |
1/16"
Bull |
"N"
Brale Penetrater |
3000 kgm
Load |
150 kgm C
Scale
|
60 kgm A
Scale
|
100 kgm D
Scale
|
100 kgm B
Scale
|
15 kg Load
15 N
|
30 kg Load
30N
|
45 kg Load
45N
|
Diam. Of
Ball Impression in m/m
|
Hardness
Number
|
|
|
Equivalent
1000 lb. Sq. In.
|
80
|
92
|
87
|
|
97
|
92
|
87
|
|
|
1865
|
|
|
79
|
92
|
86
|
|
|
92
|
87
|
|
|
1787
|
|
|
78
|
91
|
85
|
|
96
|
91
|
86
|
|
|
1710
|
|
|
77
|
91
|
84
|
|
|
91
|
85
|
|
|
1633
|
|
|
76
|
90
|
83
|
|
96
|
90
|
84
|
|
|
1556
|
|
|
75
|
90
|
83
|
|
|
89
|
83
|
|
|
1478
|
|
|
74
|
89
|
82
|
|
95
|
89
|
82
|
|
|
1400
|
|
|
73
|
89
|
81
|
|
|
88
|
81
|
|
|
1323
|
|
|
72
|
88
|
80
|
|
95
|
87
|
80
|
|
|
1245
|
|
|
71
|
87
|
80
|
|
|
87
|
79
|
|
|
1160
|
99
|
|
70
|
87
|
79
|
|
94
|
86
|
78
|
|
|
1076
|
98
|
|
69
|
86
|
78
|
|
94
|
85
|
77
|
|
|
1004
|
97
|
|
68
|
86
|
77
|
|
|
85
|
79
|
|
|
942
|
96
|
|
67
|
85
|
76
|
|
93
|
84
|
75
|
|
|
894
|
95
|
|
66
|
85
|
76
|
|
93
|
83
|
73
|
|
|
854
|
93
|
|
65
|
84
|
75
|
|
92
|
82
|
72
|
2.25
|
745
|
820
|
91
|
|
64
|
84
|
74
|
|
|
81
|
74
|
2.30
|
710
|
789
|
88
|
|
63
|
83
|
73
|
|
92
|
80
|
70
|
2.30
|
710
|
763
|
87
|
|
62
|
83
|
73
|
|
91
|
79
|
69
|
2.35
|
682
|
746
|
85
|
|
61
|
82
|
72
|
|
91
|
79
|
68
|
2.35
|
682
|
720
|
83
|
|
60
|
81
|
71
|
|
90
|
78
|
67
|
2.40
|
653
|
697
|
82
|
|
59
|
81
|
70
|
|
90
|
77
|
66
|
2.45
|
627
|
674
|
80
|
326
|
58
|
80
|
69
|
|
89
|
76
|
65
|
2.55
|
578
|
653
|
78
|
315
|
57
|
80
|
69
|
|
89
|
75
|
63
|
2.55
|
578
|
633
|
77
|
304
|
56
|
79
|
68
|
|
88
|
74
|
62
|
2.60
|
555
|
613
|
75
|
294
|
55
|
79
|
67
|
|
88
|
73
|
61
|
2.60
|
555
|
595
|
74
|
287
|
54
|
78
|
66
|
|
87
|
72
|
60
|
2.65
|
534
|
577
|
72
|
279
|
53
|
77
|
65
|
|
87
|
71
|
59
|
2.70
|
514
|
560
|
71
|
269
|
52
|
77
|
65
|
|
86
|
70
|
57
|
2.75
|
495
|
544
|
69
|
261
|
51
|
76
|
64
|
|
86
|
69
|
56
|
2.75
|
495
|
528
|
68
|
254
|
50
|
76
|
63
|
|
86
|
69
|
55
|
2.80
|
477
|
513
|
67
|
245
|
49
|
75
|
62
|
|
85
|
68
|
54
|
2.85
|
461
|
498
|
65
|
238
|
48
|
75
|
61
|
|
85
|
67
|
53
|
2.90
|
444
|
484
|
64
|
232
|
47
|
74
|
61
|
|
84
|
66
|
51
|
2.90
|
444
|
471
|
63
|
225
|
46
|
73
|
60
|
|
84
|
65
|
50
|
2.95
|
432
|
458
|
62
|
219
|
45
|
73
|
59
|
|
83
|
64
|
49
|
3.00
|
415
|
446
|
61
|
211
|
44
|
73
|
59
|
|
83
|
63
|
48
|
3.00
|
415
|
434
|
59
|
206
|
43
|
72
|
58
|
|
82
|
62
|
47
|
3.05
|
401
|
423
|
58
|
202
|
42
|
72
|
57
|
|
82
|
61
|
46
|
3.10
|
388
|
412
|
56
|
198
|
41
|
71
|
56
|
|
81
|
60
|
44
|
3.10
|
388
|
402
|
55
|
191
|
40
|
70
|
55
|
|
80
|
60
|
43
|
3.15
|
375
|
392
|
54
|
185
|
39
|
70
|
55
|
|
80
|
59
|
42
|
3.20
|
363
|
382
|
53
|
181
|
38
|
69
|
54
|
|
79
|
58
|
41
|
3.25
|
352
|
372
|
51
|
176
|
37
|
69
|
53
|
109
|
79
|
57
|
40
|
3.30
|
341
|
363
|
50
|
171
|
36
|
68
|
52
|
109
|
78
|
56
|
39
|
3.35
|
331
|
354
|
49
|
168
|
35
|
68
|
52
|
108
|
78
|
55
|
37
|
3.35
|
331
|
345
|
48
|
163
|
34
|
67
|
51
|
108
|
77
|
54
|
36
|
3.40
|
321
|
336
|
46
|
159
|
33
|
67
|
50
|
107
|
77
|
53
|
38
|
3.45
|
311
|
327
|
45
|
154
|
32
|
66
|
49
|
106
|
76
|
52
|
34
|
3.50
|
302
|
318
|
44
|
150
|
31
|
66
|
48
|
106
|
76
|
51
|
33
|
3.55
|
293
|
310
|
43
|
146
|
30
|
65
|
48
|
105
|
75
|
50
|
32
|
3.60
|
285
|
302
|
42
|
142
|
29
|
65
|
47
|
104
|
75
|
50
|
30
|
3.65
|
277
|
294
|
41
|
138
|
28
|
64
|
46
|
103
|
74
|
49
|
29
|
3.70
|
269
|
286
|
40
|
134
|
27
|
64
|
45
|
103
|
73
|
48
|
28
|
3.75
|
262
|
279
|
39
|
131
|
26
|
63
|
45
|
102
|
73
|
47
|
27
|
3.80
|
255
|
272
|
38
|
126
|
25
|
63
|
44
|
101
|
72
|
46
|
26
|
3.80
|
255
|
266
|
37
|
124
|
24
|
62
|
43
|
100
|
72
|
45
|
24
|
3.85
|
248
|
260
|
37
|
122
|
23
|
62
|
42
|
99
|
71
|
44
|
23
|
3.90
|
241
|
254
|
36
|
118
|
22
|
62
|
42
|
99
|
71
|
43
|
22
|
3.95
|
235
|
248
|
35
|
116
|
21
|
61
|
41
|
98
|
70
|
42
|
21
|
4.00
|
229
|
243
|
35
|
113
|
20
|
61
|
40
|
97
|
69
|
42
|
20
|
4.05
|
223
|
238
|
34
|
111
|
18
|
|
|
95
|
|
|
|
4.10
|
217
|
230
|
33
|
107
|
16*
|
|
|
94
|
|
|
|
4.15
|
212
|
222
|
32
|
102
|
14*
|
|
|
92
|
|
|
|
4.25
|
203
|
213
|
31
|
98
|
12*
|
|
|
90
|
|
|
|
4.35
|
192
|
204
|
29
|
92
|
10*
|
|
|
89
|
|
|
|
4.40
|
187
|
195
|
28
|
90
|
8*
|
|
|
87
|
|
|
|
4.50
|
179
|
187
|
27
|
87
|
6*
|
|
|
85
|
|
|
|
4.60
|
170
|
180
|
26
|
83
|
4*
|
|
|
84
|
|
|
|
4.65
|
166
|
173
|
25
|
79
|
2*
|
|
|
82
|
|
|
|
4.80
|
156
|
166
|
25
|
77
|
0*
|
|
|
81
|
|
|
|
4.80
|
156
|
160
|
25
|
74
|
| |
|
|
79
|
|
|
|
4.90
|
149
|
156
|
23
|
73
|
| |
|
|
77
|
|
|
|
5.00
|
143
|
150
|
22
|
70
|
| |
|
|
74
|
|
|
|
5.10
|
137
|
143
|
21
|
67
|
| |
|
|
72
|
|
|
|
5.20
|
131
|
137
|
|
65
|
| |
|
|
70
|
|
|
|
5.30
|
126
|
132
|
20
|
62
|
| |
|
|
68
|
|
|
|
5.40
|
121
|
127
|
19
|
60
|
| |
|
|
65
|
|
|
|
5.50
|
116
|
122
|
18
|
58
|
| |
|
|
|
|
|
|
5.60
|
112
|
117
|
15
|
56
|
|
|
|
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