| Hardness Conversion | ||||||||||||||
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|
100 |
7 |
82.5 |
93.1 |
83.1 |
72.9 |
- |
- |
61.5 |
251 |
201 |
240 |
116 |
730 |
|
|
99 |
5 |
81.0 |
92.8 |
82.5 |
71.9 |
- |
- |
60.9 |
246 |
195 |
234 |
112 |
725 |
|
|
98 |
- |
79.0 |
92.5 |
81.8 |
70.9 |
- |
- |
60.2 |
241 |
189 |
228 |
109 |
719 |
|
|
97 |
- |
77.5 |
92.1 |
81.1 |
69.9 |
- |
- |
59.5 |
236 |
184 |
222 |
106 |
713 |
|
|
96 |
- |
76.0 |
91.8 |
80.4 |
68.9 |
- |
- |
58.9 |
231 |
179 |
216 |
103 |
707 |
|
|
95 |
- |
74.0 |
91.5 |
79.8 |
67.9 |
- |
- |
58.3 |
226 |
175 |
210 |
101 |
701 |
|
|
94 |
- |
72.5 |
91.2 |
79.1 |
66.9 |
- |
- |
57.6 |
221 |
171 |
205 |
98 |
696 |
|
|
93 |
- |
71.0 |
90.8 |
78.4 |
65.9 |
- |
- |
57.0 |
216 |
167 |
200 |
96 |
690 |
|
|
92 |
- |
69.0 |
90.5 |
77.8 |
64.8 |
- |
100 |
56.4 |
211 |
163 |
195 |
93 |
684 |
|
|
91 |
- |
67.5 |
90.2 |
77.1 |
63.8 |
- |
99.5 |
55.8 |
206 |
160 |
190 |
91 |
679 |
|
|
90 |
- |
66.0 |
89.9 |
76.4 |
62.8 |
- |
98.5 |
55.2 |
201 |
157 |
185 |
89 |
674 |
|
|
89 |
- |
64.0 |
89.5 |
75.8 |
61.8 |
- |
98.0 |
54.6 |
196 |
154 |
180 |
87 |
668 |
|
|
88 |
- |
62.5 |
89.2 |
75.1 |
60.8 |
- |
97.0 |
54.0 |
192 |
151 |
176 |
85 |
662 |
|
|
87 |
- |
61.0 |
88.9 |
74.4 |
59.8 |
- |
96.5 |
53.4 |
188 |
148 |
172 |
83 |
656 |
|
|
86 |
- |
59.0 |
88.6 |
73.8 |
58.8 |
- |
95.5 |
52.8 |
184 |
145 |
169 |
81 |
651 |
|
|
85 |
- |
57.5 |
88.2 |
73.1 |
57.8 |
- |
94.5 |
52.3 |
180 |
142 |
165 |
80 |
646 |
|
|
84 |
- |
56.0 |
87.9 |
72.4 |
56.8 |
- |
94.0 |
51.7 |
176 |
140 |
162 |
78 |
640 |
|
|
83 |
- |
54.0 |
87.6 |
71.8 |
55.8 |
- |
93.0 |
51.1 |
173 |
137 |
159 |
77 |
634 |
|
|
82 |
- |
52.5 |
87.3 |
71.1 |
54.8 |
- |
92.0 |
50.6 |
170 |
135 |
156 |
75 |
629 |
|
|
81 |
- |
51.0 |
86.9 |
70.4 |
53.8 |
- |
91.0 |
50.0 |
167 |
133 |
153 |
74 |
624 |
|
|
80 |
- |
49.0 |
86.6 |
69.7 |
52.8 |
- |
90.5 |
49.5 |
164 |
130 |
150 |
72 |
618 |
|
|
79 |
- |
47.5 |
86.3 |
69.1 |
51.8 |
- |
89.5 |
48.9 |
161 |
128 |
147 |
|
612 |
|
|
78 |
- |
46.0 |
86.0 |
68.4 |
50.8 |
- |
88.5 |
48.4 |
158 |
126 |
144 |
- |
607 |
|
|
77 |
- |
44.0 |
85.6 |
67.7 |
49.8 |
- |
88.0 |
47.9 |
155 |
124 |
141 |
- |
602 |
|
|
76 |
- |
42.5 |
85.3 |
67.1 |
48.8 |
- |
87.0 |
47.3 |
152 |
122 |
139 |
- |
596 |
|
|
75 |
99.6 |
41.0 |
85.0 |
66.4 |
47.8 |
- |
86.0 |
46.8 |
150 |
120 |
137 |
- |
592 |
|
|
74 |
99.1 |
39.0 |
84.7 |
65.7 |
46.8 |
- |
85.0 |
46.3 |
147 |
118 |
135 |
- |
587 |
|
|
73 |
98.5 |
37.5 |
84.3 |
65.1 |
45.8 |
- |
84.5 |
45.8 |
145 |
116 |
132 |
- |
581 |
|
|
72 |
98.0 |
36.0 |
84.0 |
64.4 |
44.8 |
- |
83.5 |
45.3 |
143 |
114 |
130 |
- |
576 |
|
|
71 |
97.4 |
34.5 |
83.7 |
63.7 |
43.8 |
100 |
82.5 |
44.8 |
141 |
112 |
127 |
- |
571 |
|
|
70 |
96.8 |
32.5 |
83.4 |
63.1 |
42.8 |
99.5 |
81.5 |
44.3 |
139 |
110 |
125 |
- |
566 |
|
|
69 |
96.2 |
31.0 |
83.0 |
62.4 |
41.8 |
99.0 |
81.0 |
43.8 |
137 |
109 |
123 |
- |
561 |
|
|
68 |
95.6 |
29.5 |
82.7 |
61.7 |
40.8 |
98.0 |
80.0 |
43.3 |
135 |
107 |
121 |
- |
556 |
|
|
67 |
95.1 |
28.0 |
82.4 |
61.0 |
39.8 |
97.5 |
79.0 |
42.8 |
133 |
106 |
119 |
- |
551 |
|
|
66 |
94.5 |
26.5 |
82.1 |
60.4 |
38.7 |
97.0 |
78.0 |
42.3 |
131 |
104 |
117 |
- |
546 |
|
|
65 |
93.9 |
25.0 |
81.8 |
59.7 |
37.7 |
96.0 |
77.5 |
41.8 |
129 |
102 |
116 |
- |
542 |
|
|
64 |
93.4 |
23.5 |
81.4 |
59.0 |
36.7 |
95.5 |
76.5 |
41.4 |
127 |
101 |
114 |
- |
537 |
|
|
63 |
92.8 |
22.0 |
81.1 |
58.4 |
35.7 |
95.0 |
75.5 |
40.9 |
125 |
99 |
112 |
- |
532 |
|
|
62 |
92.2 |
20.5 |
80.8 |
57.7 |
34.7 |
94.5 |
74.5 |
40.4 |
124 |
98 |
110 |
- |
527 |
|
|
61 |
91.7 |
19.0 |
80.5 |
57.0 |
33.7 |
93.5 |
74.0 |
40.0 |
122 |
96 |
108 |
- |
522 |
|
|
60 |
91.1 |
17.5 |
80.1 |
56.4 |
32.7 |
93.0 |
73.0 |
39.5 |
120 |
95 |
107 |
- |
517 |
|
|
59 |
90.5 |
16.0 |
79.8 |
56.7 |
31.7 |
92.5 |
72.0 |
39.0 |
118 |
94 |
106 |
- |
512 |
|
|
58 |
90.0 |
14.5 |
79.5 |
55.0 |
30.7 |
92.0 |
71.0 |
38.6 |
117 |
92 |
104 |
- |
507 |
|
|
57 |
89.4 |
13.0 |
79.2 |
54.4 |
29.7 |
91.0 |
70.5 |
38.1 |
115 |
91 |
103 |
- |
502 |
|
|
56 |
88.8 |
11.5 |
78.8 |
53.7 |
28.7 |
90.5 |
69.5 |
37.7 |
114 |
90 |
101 |
- |
497 |
|
|
55 |
88.2 |
10.0 |
78.5 |
53.0 |
27.7 |
90.0 |
68.5 |
37.2 |
112 |
89 |
100 |
- |
492 |
|
|
54 |
87.7 |
8.5 |
78.2 |
52.4 |
26.7 |
89.5 |
68.0 |
36.8 |
111 |
87 |
- |
- |
487 |
|
|
53 |
87.1 |
7.0 |
77.9 |
51.7 |
25.7 |
89.0 |
67.0 |
36.3 |
110 |
86 |
- |
- |
482 |
|
|
52 |
86.5 |
5.5 |
77.5 |
51.0 |
24.7 |
88.0 |
66.0 |
35.9 |
109 |
85 |
- |
- |
477 |
|
|
51 |
86.0 |
4.0 |
77.2 |
50.3 |
23.7 |
87.5 |
65.0 |
35.5 |
108 |
84 |
- |
- |
472 |
|
|
50 |
85.4 |
2.5 |
76.9 |
49.7 |
22.7 |
87.0 |
64.5 |
35.0 |
107 |
83 |
- |
- |
468 |
|
|
Although
conversion tables dealing with hardness can only be approximate and
never mathematically exact, it is of considerable value to be able to
compare different hardness scales. This table is based on the assumption
that the metal tested is homogeneous to a depth several times as great
as the depth of the indentation. |
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