|
Hardness Conversion Table |
|
ROCKWELL
|
BRINELL
|
VICKERS
|
SCLERO-
SCOPE
|
TENSILE
STRENGTH
|
|
10m/m ball
|
|
Diamond Brale
|
1/16"
bull
|
3000 kgm load
|
|
HRC
|
HRA
|
HRD
|
HBB
|
Diam. of
Ball
Impression
in m/m
|
HB
|
HV
|
|
Equivalent
1000 lb. Sq. In/
|
|
61
|
82
|
72
|
|
2.35
|
682
|
720
|
83
|
|
|
60
|
81
|
71
|
|
2.4
|
653
|
697
|
82
|
|
|
59
|
81
|
70
|
|
2.45
|
627
|
674
|
80
|
326
|
|
58
|
80
|
69
|
|
2.55
|
578
|
653
|
78
|
315
|
|
57
|
80
|
69
|
|
2.55
|
578
|
633
|
77
|
304
|
|
56
|
79
|
68
|
|
2.6
|
555
|
613
|
75
|
294
|
|
55
|
79
|
67
|
|
2.6
|
555
|
595
|
74
|
287
|
|
54
|
78
|
66
|
|
2.65
|
534
|
577
|
72
|
279
|
|
53
|
77
|
65
|
|
2.7
|
514
|
560
|
71
|
269
|
|
52
|
77
|
65
|
|
2.75
|
495
|
544
|
69
|
261
|
|
51
|
76
|
64
|
|
2.75
|
495
|
528
|
68
|
254
|
|
50
|
76
|
63
|
|
2.8
|
477
|
513
|
67
|
245
|
|
49
|
75
|
62
|
|
2.85
|
461
|
498
|
65
|
238
|
|
48
|
75
|
61
|
|
2.9
|
444
|
484
|
64
|
232
|
|
47
|
74
|
61
|
|
2.9
|
444
|
471
|
63
|
225
|
|
46
|
73
|
60
|
|
2.95
|
432
|
458
|
62
|
219
|
|
45
|
73
|
59
|
|
3
|
415
|
446
|
61
|
211
|
|
44
|
73
|
59
|
|
3
|
415
|
434
|
59
|
206
|
|
43
|
72
|
58
|
|
3.05
|
401
|
423
|
58
|
202
|
|
42
|
72
|
57
|
|
3.1
|
388
|
412
|
56
|
198
|
|
41
|
71
|
56
|
|
3.1
|
388
|
402
|
55
|
191
|
|
40
|
70
|
55
|
|
3.15
|
375
|
392
|
54
|
185
|
|
39
|
70
|
55
|
|
3.2
|
363
|
382
|
53
|
181
|
|
38
|
69
|
54
|
|
3.25
|
352
|
372
|
51
|
176
|
|
37
|
69
|
53
|
109
|
3.3
|
341
|
363
|
50
|
171
|
|
36
|
68
|
52
|
109
|
3.35
|
331
|
354
|
49
|
168
|
|
35
|
68
|
52
|
108
|
3.35
|
331
|
345
|
48
|
163
|
|
34
|
67
|
51
|
108
|
3.4
|
321
|
336
|
46
|
159
|
|
33
|
67
|
50
|
107
|
3.45
|
311
|
327
|
45
|
154
|
|
32
|
66
|
49
|
106
|
3.5
|
302
|
318
|
44
|
150
|
|
31
|
66
|
48
|
106
|
3.55
|
293
|
310
|
43
|
146
|
|
30
|
65
|
48
|
105
|
3.6
|
285
|
302
|
42
|
142
|
|
29
|
65
|
47
|
104
|
3.65
|
277
|
294
|
41
|
138
|
|
28
|
64
|
46
|
103
|
3.7
|
269
|
286
|
40
|
134
|
|
27
|
64
|
45
|
103
|
3.75
|
262
|
279
|
39
|
131
|
|
26
|
63
|
45
|
102
|
3.8
|
255
|
272
|
38
|
126
|
|
25
|
63
|
44
|
101
|
3.8
|
255
|
266
|
37
|
124
|
|
24
|
62
|
43
|
100
|
3.85
|
248
|
260
|
37
|
122
|
|
23
|
62
|
42
|
99
|
3.9
|
241
|
254
|
36
|
118
|
|
22
|
62
|
42
|
99
|
3.95
|
235
|
248
|
35
|
116
|
|
21
|
61
|
41
|
98
|
4
|
229
|
243
|
35
|
113
|
|
20
|
61
|
40
|
97
|
4.05
|
223
|
238
|
34
|
111
|
|
18
|
|
|
95
|
4.1
|
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
|
4.4
|
187
|
195
|
28
|
90
|
|
8*
|
|
|
87
|
4.5
|
179
|
187
|
27
|
87
|
|
6*
|
|
|
85
|
4.6
|
170
|
180
|
26
|
83
|
|
4*
|
|
|
84
|
4.65
|
166
|
173
|
25
|
79
|
|
2*
|
|
|
82
|
4.8
|
156
|
166
|
25
|
77
|
|
0*
|
|
|
81
|
4.8
|
156
|
160
|
25
|
74
|
|
Conversion Table