Hardness Conversion Chart
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1| Hardness Conversion Chart
Cylindrical Correction Chart 53
Cylindrical work corrections to be added to observed
Hardened Steel and Hardened Alloys
Soft Steel, Grey and Malleable Cast Iron and Most Non-Ferrous Metals
Rockwell number for scales indicated
Tensile
Micro-
Scales C, D, A
Tensile
Micro-
Rockwell
Superficial
Knoop
Brinell
Rockwell
Superficial
Vickers Knoop Brinell
Strength
ficial
Strength
ficial
Brale Diamond Indenter
Diameter of Specimen - inches (mm)
C
A
D
G
15-N 30-N 45-N
HV
HK
HB
KSI
WMN
B
F
G
A
E
H
K
15-T
30-T
45-T
HK
HB
KSI
WMN
HB
HV
Observed
1/8
1/4
3/8
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
3000
500
150
15
30
45
500
100
60
150
100
60
150
15
30
45
500
Reading
(3.2)
(6.4)
(10)
(13)
(16)
(19)
(22)
(25)
(32)
(38)
150
60
100
kg
1000
60
kg
3000
1000
kg
kg
kg
kg
kg
kg
kg
kg
kg
gm
1000
kg
kg
kg
kg
gm
1000
kg
10
kg
lbs/
kg
kg
kg
10 kg
10
lbs/
90
NA
0.5
0
0
0
0
0
0
0
0
1/16”
1/16”
1/16”
1/8”
1/8”
1/8”
1/16”
1/16”
1/16”
and
gm
1/16”
N
N
N
and
gm
Brale
mm
10 kg
sq in
Brale
Brale
Brale
mm
sq in
85
0.5
0.5
0.5
0
0
0
0
0
0
ball
ball
ball
ball
ball
ball
ball
ball
ball
over
ball
Brale
Brale
Brale
over
ball
ball
80
0.5
0.5
0.5
0.5
0.5
0
0
0
0
100
82.5
61.5
93.1
83.1
72.9
251
201
240
116
730
80
92.0
86.5
96.5
92.0
87.0
1865
-
-
75
1.0
0.5
0.5
0.5
0.5
0.5
0
0
0
99
81.0
60.9
92.8
82.5
71.9
246
195
234
114
725
79
91.5
85.5
96.3
91.5
86.5
1787
-
-
70
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0
0
98
79.0
60.2
92.5
81.8
70.9
241
189
228
109
719
78
91.0
84.5
96.0
91.0
85.5
1710
-
-
65
1.5
1.0
1.0
0.5
0.5
0.5
0.5
0
0
97
77.5
59.5
92.1
81.1
69.9
236
184
222
104
713
77
90.5
84.0
95.8
90.5
84.5
1633
-
-
60
1.5
1.0
1.0
0.5
0.5
0.5
0.5
0
0
96
76.0
58.9
91.8
80.4
68.9
231
179
216
102
707
76
90.0
83.0
95.5
90.0
83.5
1556
-
-
55
2.0
1.5
1.0
1.0
0.5
0.5
0.5
0.5
0
95
74.0
58.3
91.5
79.8
67.9
226
175
210
100
701
75
89.5
82.5
95.3
89.0
82.5
1478
-
-
50
2.5
2.0
1.5
1.0
1.0
0.5
0.5
0.5
0.5
94
72.5
57.6
91.2
79.1
66.9
221
171
205
98
696
74
89.0
81.5
95.0
88.5
81.5
1400
-
-
45
3.0
2.0
1.5
1.0
1.0
1.0
0.5
0.5
0.5
93
71.0
57.0
NA
90.8
78.4
65.9
216
167
200
94
690
73
88.5
81.0
94.8
88.0
80.5
1323
-
-
40
3.5
2.5
2.0
1.5
1.0
1.0
1.0
0.5
0.5
92
69.0
56.4
100
90.5
77.8
64.8
211
163
195
92
684
72
88.0
80.0
94.5
87.0
79.5
1245
-
-
35
4.0
3.0
2.0
1.5
1.5
1.0
1.0
0.5
0.5
91
67.5
55.8
99.5
90.2
77.1
63.8
206
160
190
90
679
71
87.0
79.5
94.3
86.5
78.5
1160
-
-
30
5.0
3.5
2.5
2.0
1.5
1.5
1.0
1.0
0.5
90
66.0
55.2
98.5
89.9
76.4
62.8
201
157
185
89
674
70
86.5
78.5
94.0
86.0
77.5
1076
972
953
25
5.5
4.0
3.0
2.5
2.0
1.5
1.0
1.0
1.0
89
64.0
54.6
98.0
89.5
75.8
61.8
196
154
180
88
668
69
86.0
78.0
93.5
85.0
76.5
1004
946
949
20
6.0
4.5
3.5
2.5
2.0
1.5
1.5
1.0
1.0
88
62.5
54.0
97.0
89.2
75.1
60.8
192
151
176
86
662
87
61.0
53.4
96.5
88.9
74.4
59.8
188
148
172
84
656
68
85.6
76.9
93.2
84.4
75.4
940
920
945
Scales B, F, G
86
59.0
52.8
95.5
88.6
73.8
58.8
184
145
169
83
651
67
85.0
76.1
92.9
83.6
74.2
900
895
942
1/16-in Ball Indenter
66
84.5
75.4
92.5
82.8
73.3
865
870
NA
938
85
57.5
52.3
94.5
88.2
73.1
57.8
180
142
165
82
646
Diameter of Specimen - inches (mm)
84
56.0
51.7
94.0
87.9
72.4
56.8
176
140
162
81
640
65
83.9
74.5
92.2
81.9
72.0
832
846
739
934
Observed
1/8
1/4
3/8
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
83
54.0
51.1
93.0
87.6
71.8
55.8
173
137
159
80
634
64
83.4
73.8
91.8
81.1
71.0
800
822
722
930
Reading
(3.2)
(6.4)
(10)
(13)
(16)
(19)
(22)
(25)
(32)
(38)
82
52.5
50.6
92.0
87.3
71.1
54.8
170
135
156
77
629
63
82.8
73.0
91.4
80.1
69.9
772
799
706
926
100
NA
3.5
2.5
1.5
1.5
1.0
1.0
0.5
NA
NA
81
51.0
50.0
91.0
86.9
70.4
53.8
167
133
153
73
624
62
82.3
72.2
91.1
79.3
68.8
746
776
688
922
90
4.0
3.0
2.0
1.5
1.5
1.5
1.0
80
49.0
49.5
90.5
86.6
69.7
52.8
164
130
150
72
618
61
81.8
71.5
90.7
78.4
67.7
720
754
670
917
80
5.0
3.5
2.5
2.0
1.5
1.5
1.5
79
47.5
48.9
89.5
86.3
69.1
51.8
161
128
147
70
612
60
81.2
70.7
90.2
77.5
66.6
697
732
654
NA
913
70
6.0
4.0
3.0
2.5
2.0
2.0
1.5
78
46.0
48.4
88.5
86.0
68.4
50.8
158
126
144
69
607
59
80.7
69.9
89.8
76.6
65.5
674
710
634
351
909
60
7.0
5.0
3.5
3.0
2.5
2.0
2.0
77
44.0
47.9
88.0
85.6
67.7
49.8
155
124
141
68
602
58
80.1
69.2
89.3
75.7
64.3
653
690
615
338
904
50
8.0
5.5
4.0
3.5
3.0
2.5
2.0
76
NA
42.5
47.3
87.0
85.3
67.1
48.8
152
122
139
67
596
57
79.6
68.5
88.9
74.8
63.2
633
670
595
325
900
40
9.0
6.0
4.5
4.0
3.0
2.5
2.5
75
99.6
41.0
46.8
86.0
85.0
66.4
47.8
150
120
137
66
592
56
79.0
67.7
88.3
73.9
62.0
613
650
577
313
896
30
10.0
6.5
5.0
4.5
3.5
3.0
2.5
74
99.1
39.0
46.3
85.0
84.7
65.7
46.8
147
118
135
65
587
55
78.5
66.9
87.9
73.0
60.9
595
630
560
301
891
20
11.0
7.5
5.5
4.5
4.0
3.5
3.0
73
98.5
37.5
45.8
84.5
84.3
65.1
45.8
145
116
132
64
581
54
78.0
66.1
87.4
72.0
59.8
577
612
543
292
887
72
98.0
36.0
45.3
NA
83.5
84.0
64.4
44.8
143
114
130
63
576
10
12.0
8.0
6.0
5.0
4.0
3.5
3.0
71
97.4
34.5
44.8
100
82.5
83.7
63.7
43.8
141
112
127
62
571
53
77.4
65.4
86.9
71.2
58.6
560
594
525
283
883
0
12.5
8.5
6.5
5.5
4.5
3.5
3.0
52
76.8
64.6
86.4
70.2
57.4
544
576
512
273
879
70
96.8
32.5
44.3
99.5
81.5
83.4
63.1
42.8
139
110
125
61
566
Scales 15-N, 30-N, 45-N
69
96.2
31.0
43.8
99.0
81.0
83.0
62.4
41.8
137
109
123
60
561
51
76.3
63.8
85.9
69.4
56.1
528
558
496
264
874
N Brale Diamond Indenter
68
95.6
29.5
43.3
98.0
80.0
82.7
61.7
40.8
135
107
121
59
556
50
75.9
63.1
85.5
68.5
55.0
513
542
481
255
870
Diameter of Specimen - inches (mm)
67
95.1
28.0
42.8
97.5
79.0
82.4
61.0
39.8
133
106
119
58
551
49
75.2
62.1
85.0
67.6
53.8
498
526
469
246
865
Observed
1/8
1/4
3/8
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
66
94.5
26.5
42.3
97.0
78.0
82.1
60.4
38.7
131
104
117
57
546
48
74.7
61.4
84.5
66.7
52.5
484
510
455
238
861
Reading
(3.2)
(6.4)
(10)
(13)
(16)
(19)
(22)
(25)
(32)
(38)
65
93.9
25.0
41.8
96.0
77.5
81.8
59.7
37.7
129
102
116
56
542
47
74.1
60.8
83.9
65.8
51.4
471
495
443
229
856
90
0
0
0
0
0
0
0
0
NA
NA
64
93.4
23.5
41.4
95.5
76.5
81.4
59.0
36.7
127
101
114
NA
537
46
73.6
60.0
83.5
64.8
50.3
458
480
432
221
851
85
0.5
0.5
0.5
0.5
0
0
0
0
63
92.8
22.0
40.9
95.0
75.5
81.1
58.4
35.7
125
99
112
532
45
73.1
59.2
83.0
64.0
49.0
446
466
421
215
847
80
1.0
0.5
0.5
0.5
0.5
0
0
0
62
92.2
20.5
40.4
94.5
74.5
80.8
57.7
34.7
124
98
110
527
44
72.5
58.5
82.5
63.1
47.8
434
452
409
208
842
75
1.5
1.0
0.5
0.5
0.5
0.5
0
0
61
91.7
19.0
40.0
93.5
74.0
80.5
57.0
33.7
122
96
108
522
43
72.0
57.7
82.0
62.2
46.7
423
438
400
201
837
70
2.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
60
91.1
17.5
39.5
93.0
73.0
80.1
56.4
32.7
120
95
107
517
42
71.5
56.9
81.5
61.3
45.5
412
426
390
194
832
65
2.5
1.5
1.0
0.5
0.5
0.5
0.5
0.5
59
90.5
16.0
39.0
92.5
72.0
79.8
55.7
31.7
118
94
106
512
41
70.9
56.2
80.9
60.4
44.3
402
414
381
188
827
60
3.0
1.5
1.0
1.0
1.0
0.5
0.5
0.5
58
90.0
14.5
38.6
92.0
71.0
79.5
55.0
30.7
117
92
104
507
40
70.4
55.4
80.4
59.5
43.1
392
402
371
182
822
57
89.4
13.0
38.1
91.0
70.5
79.2
54.4
29.7
115
91
103
502
55
3.5
2.0
1.5
1.0
1.0
0.5
0.5
0.5
39
69.9
54.6
79.9
58.6
41.9
382
391
362
177
817
56
88.8
11.5
37.7
90.5
69.5
78.8
53.7
28.7
114
90
101
497
50
3.5
2.0
1.5
1.0
1.0
1.0
1.0
0.5
38
69.4
53.8
79.4
57.7
40.8
372
380
353
171
812
55
88.2
10.0
37.2
90.0
68.5
78.5
53.0
27.7
112
89
100
492
45
4.0
2.0
1.5
1.0
1.0
1.0
1.0
1.0
37
68.9
53.1
78.8
56.8
39.6
363
370
344
166
807
54
87.7
8.5
36.8
89.5
68.0
78.2
52.4
26.7
111
87
NA
487
40
4.5
2.5
1.5
1.5
1.0
1.0
1.0
1.0
53
87.1
7.0
36.3
89.0
67.0
77.9
51.7
25.7
110
86
482
36
68.4
52.3
78.3
55.9
38.4
354
360
336
161
802
35
5.0
2.5
2.0
1.5
1.0
1.0
1.0
1.0
52
86.5
5.5
35.9
88.0
66.0
77.5
51.0
24.7
109
85
477
35
67.9
51.5
77.7
55.0
37.2
345
351
327
156
798
30
5.5
3.0
2.0
1.5
1.5
1.0
1.0
1.0
51
86.0
4.0
35.5
87.5
65.0
77.2
50.3
23.7
108
84
472
34
67.4
50.8
77.2
54.2
36.1
336
342
319
152
793
25
5.5
3.0
2.0
1.5
1.5
1.5
1.5
1.0
50
85.4
2.5
35.0
87.0
64.5
76.9
49.7
22.7
107
83
468
33
66.8
50.0
76.6
53.3
34.9
327
334
311
149
788
20
6.0
3.0
2.0
1.5
1.5
1.5
1.5
1.5
49
84.8
NA
34.6
86.5
63.5
76.6
49.0
21.7
106
82
463
32
66.3
49.2
76.1
52.1
33.7
318
326
301
146
783
Scales 15-T, 30-T, 45-T
48
84.3
34.1
85.5
62.5
76.2
48.3
20.7
105
81
458
31
65.8
48.4
NA
75.6
51.3
32.5
310
318
294
141
778
1/16-in Ball Indenter
47
83.7
33.7
85.0
61.5
75.9
47.7
19.7
104
80
453
30
65.3
47.7
92.0
75.0
50.4
31.3
302
311
286
138
773
Diameter of Specimen - inches (mm)
46
83.1
33.3
84.5
61.0
75.6
47.0
18.7
103
80
448
29
64.6
47.0
91.0
74.5
49.5
30.1
294
304
279
135
768
Observed
1/8
1/4
3/8
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
45
82.6
32.9
84.0
60.0
75.3
46.3
17.7
102
79
444
28
64.3
46.1
90.0
73.9
48.6
28.9
286
297
271
131
762
44
82.0
32.4
83.5
59.0
74.9
45.7
16.7
101
78
439
Reading
(3.2)
(6.4)
(10)
(13)
(16)
(19)
(22)
(25)
(32)
(38)
27
63.8
45.2
89.0
73.3
47.7
27.8
279
290
264
128
757
90
1.5
1.0
1.0
0.5
0.5
0.5
0.5
0.5
NA
NA
43
81.4
32.0
82.5
58.0
74.6
45.0
15.7
100
77
435
26
63.3
44.6
88.0
72.8
46.8
26.7
272
284
258
125
751
42
80.8
31.6
82.0
57.5
74.3
44.3
14.7
99
76
430
80
3.0
2.0
1.5
1.5
1.0
1.0
1.0
0.5
25
62.8
43.8
87.0
72.2
45.9
25.5
266
278
253
123
746
41
80.3
31.2
81.5
56.5
74.0
43.7
13.6
98
75
426
70
5.0
3.5
2.5
2.0
1.5
1.0
1.0
1.0
24
62.4
43.1
86.0
71.6
45.0
24.3
260
272
247
119
741
40
79.7
30.7
81.0
55.5
73.6
43.0
12.6
97
75
422
60
6.5
4.5
3.0
2.5
2.0
1.5
1.5
1.5
23
62.0
42.1
84.5
71.0
44.0
23.1
254
266
243
117
736
39
79.1
30.3
80.0
54.5
73.3
42.3
11.6
96
74
417
50
8.5
5.5
4.0
3.0
2.5
2.0
2.0
1.5
38
78.6
29.9
79.5
54.0
73.0
41.6
10.6
95
73
413
22
61.5
41.6
83.5
70.5
43.2
22.0
248
261
237
115
730
40
10.0
6.5
4.5
3.5
3.0
2.5
2.0
2.0
21
61.0
40.9
82.5
69.9
42.3
20.7
243
256
231
112
725
37
78.0
29.5
79.0
NA
53.0
72.7
41.0
9.6
94
72
409
30
11.5
7.5
5.0
3.5
3.5
2.5
2.0
2.0
36
77.4
29.1
78.5
100
52.0
72.3
40.3
8.6
93
72
404
20
60.5 40.1
81.0
69.4 41.5 19.6
238
251
226
110
720
20
13.0
9.0
6.0
4.5
4.5
3.0
2.0
2.0
35
76.9
28.7
78.0
99.5
51.5
72.0
39.6
7.6
92
71
401
34
76.3
28.2
77.0
99.0
50.5
71.7
39.0
6.6
91
70
396
These corrections are approximate only and represent the averages to the nearest 1/2 Rockwell number.
Note
33
75.7
27.8
76.5
98.8
49.5
71.4
38.3
5.6
90
69
392
1: A 10 mm steel ball was used for 450 BHN and below. A 10 mm carbide ball was used above 450 BHN.
32
75.2
27.4
76.0
98.5
48.5
71.0
37.6
4.6
89
69
388
2: The tensile strength relation to hardness is not exact, even for steel, unless it is determined for a specific material.
31
74.6
27.0
75.5
98.0
48.0
70.7
37.0
3.6
88
68
384
30
74.0
26.6
75.0
97.8
47.0
70.4
36.3
2.6
87
67
380
29
73.5
26.0
74.0
97.5
46.0
70.0
35.6
1.0
87
66
376
28
73.0
25.5
73.5
97.0
45.0
69.3
34.5
NA
86
66
372
Conversions
Hardness vs Minimum Thickness Chart 55
27
72.5
25.0
73.0
96.5
44.5
69.5
34.0
85
65
369
26
72.0
24.5
72.5
96.3
43.5
69.0
33.0
84
65
365
Any greater
All values, except WMN, are consistent with ASTM E140 Tables 1 and 2, and
25
71.0
24.3
72.0
96.0
42.5
68.8
32.5
83
64
361
thickness and
Rockwell
Rockwell
24
70.5
24.0
71.0
95.5
41.5
68.5
32.0
82
64
357
hardness can be
Superficial
Regular
ASTM A370 Tables 3A and 3B, where applicable. WMN or Wilson Microficial
23
70.0
23.5
70.5
95.3
41.0
68.0
31.0
82
63
353
safely tested on
Hardness Scales
Hardness Scales
Numbers were developed by Wilson Instruments in the Wilson Standards
indicated scale
22
69.5
23.0
70.0
95.0
40.0
67.8
30.5
81
62
350
laboratory and are not derived from ASTM.
21
69.0
22.5
69.5
94.5
39.0
67.5
29.5
81
62
346
15N
30N
45N
A
D
C
20
68.5
22.0
68.5
94.3
38.0
67.3
29.0
80
61
343
15
30
45
60
100
150
19
68.0
21.5
68.0
94.0
37.5
67.0
28.5
79
61
339
Cylindrical Corrections Values are consistent with ASTM E18 Table 6,7,13, and 14
kgf
kgf
kgf
kgf
kgf
kgf
18
67.0
21.3
67.5
93.5
36.5
66.5
27.5
78
60
335
Hardness vs. Minimum Thickness Values are consistent with ASTM E18 Tables 4, 5,
Thickness
N Brale
Brale
17
66.5
21.0
67.0
93.0
35.5
66.3
27.0
78
60
332
11, and 12 except for D and G scale values, which are obtained from indentation
inches (mm)
Indenter
Indenter
16
66.0
20.5
66.5
92.8
35.0
66.0
26.0
77
59
329
hardness testing by Vincent E. Lysaght.
.006 (0.15)
92
-
-
-
-
-
15
65.5
20.0
65.5
92.5
34.0
65.5
25.5
76
59
325
14
65.0
NA
65.0
92.0
33.0
65.3
25.0
75
59
322
.008 (0.20)
90
-
-
-
-
-
13
64.5
64.5
91.8
32.0
65.0
24.0
75
58
318
Buehler Hardness Products | 1-800-695-4273
.010 (0.25)
88
-
-
-
-
-
12
64.0
64.0
91.5
31.5
64.5
23.5
74
58
314
.012 (0.30)
83
82
77
-
-
-
11
63.5
63.5
91.0
30.5
64.3
23.0
73
57
311
.014 (0.36)
76
78.5
74
-
-
-
Wilson hardness testers include a comprehensive range of hardness testers
10
63.0
62.5
90.5
29.5
64.0
22.0
72
57
308
9
62.0
62.0
90.3
29.0
63.8
21.5
71
57
304
.016 (0.41)
68
74
72
86
-
-
from Rockwell, Knoop/Vickers, and Brinell to fully automatic production
8
61.5
61.5
90.0
28.0
63.5
20.5
71
56
300
systems. Our testers are complemented by a range of test blocks, accessories,
.018 (0.46)
×
66
68
84
-
-
7
61.0
61.0
89.5
27.0
63.0
20.0
70
56
297
and fixtures. Our Wilson calibration laboratory is recognized as the global
.020 (0.51)
×
57
63
82
77
-
6
60.5
60.5
89.3
26.0
62.8
19.5
69
55
293
leader in the production of premium test blocks and indenters.
5
60.0
60.0
89.0
25.5
62.5
18.5
69
55
289
.022 (0.56)
×
47
58
79
75
69
4
59.5
59.0
88.5
24.5
62.0
18.0
69
55
286
.024 (0.61)
×
×
51
76
72
67
•
Rockwell Testers
3
59.0
58.5
88.0
23.5
61.8
17.0
68
54
283
.026 (0.66)
×
×
37
71
68
65
2
58.0
58.0
87.8
23.0
61.5
16.5
68
54
279
•
Knoop and Vickers Testers
.028 (0.71)
×
×
20
67
63
62
1
57.5
57.5
87.5
22.0
61.0
16.0
63
54
276
•
Image Analysis and Automatic Systems
.030 (0.76)
×
×
×
60
58
57
0
57.0
57.0
87.0
21.0
60.5
15.0
63
53
272
•
Brinell Testers
.032 (0.81)
×
×
×
×
51
52
The values shown are approximate only. This chart is intended primarily as a reference guide.
.034 (0.86)
×
×
×
×
43
45
•
Universal Hardness Testers
.036 (0.91)
×
×
×
×
×
37
•
Portable Testers
.038 (0.96)
×
×
×
×
×
28
•
Custom Solutions
.040 (1.02)
×
×
×
×
×
20
•
Test Blocks, Indenters, and Accessories
Any greater
thickness and
Rockwell
Rockwell
hardness can be
Superficial
Regular
Worldwide service network | 1-800-473-7838
safely tested on
Hardness Scales
Hardness Scales
indicated scale
15-T
30-T
45-T
F
B
G
15
30
45
60
100
150
kgf
kgf
kgf
kgf
kgf
kgf
Thickness
1/16-in Ball
1/16-in Ball
Providing service and support that is dedicated to ensuring the highest quality
inches (mm)
Indenter
Indenter
calibration, verification, and service throughout the world and our applications
.010 (0.25)
91
-
-
-
-
-
support combines years of experience with unparalleled expertise. With
.012 (0.30)
86
-
-
-
-
-
dedicated sales, manufacturing, and research & development facilities located
.014 (0.36)
81
80
-
-
-
-
around the world, we are always close to you.
.016 (0.41)
75
72
71
-
-
-
.018 (0.46)
68
64
62
-
-
-
Buehler is an ITW company and is backed by ITW’s professional service force. It
is the industry’s largest and most responsive group, including factory trained and
.020 (0.51)
×
55
53
-
-
-
certified service engineers, application engineers, and service specialists. Services
.022 (0.56)
×
45
43
-
-
-
include calibration and certification and preventative maintenance.
.024 (0.61)
×
34
31
98
94
94
.026 (0.66)
×
×
18
91
87
87
.028 (0.71)
×
×
4
85
80
76
.030 (0.76)
×
×
×
77
71
68
.032 (0.81)
×
×
×
69
62
59
.034 (0.86)
×
×
×
×
52
50
Download the new
.036 (0.91)
×
×
×
×
40
42
hardness converter
.038 (0.96)
×
×
×
×
28
31
app for your smart
.040 (1.02)
×
×
×
×
×
22
phone.
X = No minimum hardness. These are approximate numbers
only.
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