|
| Common
Hardness Scales
- Brinell
Hardness - Used for determining the hardness of metals.This
hardness scale is often used for steel parts and comparative
conversions between Brinell and Rockwell scales. The comparative
scales are listed in the chart below.
- Rockwell
Hardness - Probably the most familiar hardness measurement
technique because of its' wide range. Useful for measuring
many materials from soft bearing metals to carbides. The
different Rockwell scales are listed in the chart below.
- Shore's
Hardness - a common scale for elastic materials such as
rubber and plastics.
- Vicker's
Hardness - useful for thin materials.
- Knoop
Hardness - a test applicable to thin materials, plated surfaces
, exceptionally hard and brittle materials and shallow hardened
surfaces such as surfaces nitrided or carburized.
|
 |
| 
| Hardness
Conversion Chart |
| Brinell
Hardness |
Rockwell
Hardness |
| A
Scale |
B
Scale |
C
Scale |
| -- |
85.6 |
-- |
68.0 |
| -- |
85.3 |
-- |
67.5 |
| -- |
85.0 |
-- |
67.0 |
| 767 |
84.7 |
-- |
66.4 |
| 757 |
84.4 |
-- |
65.9 |
| 745 |
84.1 |
-- |
65.3 |
| 733 |
83.8 |
-- |
64.7 |
| 722 |
83.4 |
-- |
64.0 |
| 712 |
-- |
-- |
-- |
| 710 |
83.0 |
-- |
63.3 |
| 698 |
82.6 |
-- |
62.5 |
| 684 |
82.2 |
-- |
61.8 |
| 682 |
82.2 |
-- |
61.7 |
| 670 |
81.8 |
-- |
61.0 |
| 656 |
81.3 |
-- |
60.1 |
| 653 |
81.2 |
-- |
60.0 |
| 647 |
81.1 |
-- |
59.7 |
| 638 |
80.8 |
-- |
59.2 |
| 630 |
80.6 |
-- |
58.8 |
| 627 |
80.5 |
-- |
58.7 |
| 601 |
79.8 |
-- |
57.3 |
| 578 |
79.1 |
-- |
56.0 |
| 555 |
78.4 |
-- |
54.7 |
| 534 |
77.8 |
-- |
53.5 |
| 514 |
76.9 |
-- |
52.1 |
| 495 |
76.3 |
-- |
51.0 |
| 477 |
75.6 |
-- |
49.6 |
| 461 |
74.9 |
-- |
48.5 |
| 444 |
74.2 |
-- |
47.1 |
| 429 |
73.4 |
-- |
45.7 |
| 415 |
72.8 |
-- |
44.5 |
| 401 |
72.0 |
-- |
43.1 |
| 388 |
71.4 |
-- |
41.8 |
| 375 |
70.6 |
-- |
40.4 |
| 363 |
70.0 |
-- |
39.1 |
| 352 |
69.3 |
-- |
37.9 |
| 341 |
68.7 |
-- |
36.6 |
| |
|
| Brinell
Hardness |
Rockwell
Hardness |
| A
Scale |
B
Scale |
C
Scale |
| 331 |
68.1 |
-- |
35.5 |
| 321 |
67.5 |
-- |
34.3 |
| 311 |
66.9 |
-- |
33.1 |
| 302 |
66.3 |
-- |
32.1 |
| 293 |
65.7 |
-- |
30.9 |
| 285 |
65.3 |
-- |
29.9 |
| 277 |
64.6 |
-- |
28.8 |
| 269 |
64.1 |
-- |
27.6 |
| 262 |
63.6 |
-- |
26.6 |
| 255 |
63.0 |
-- |
25.4 |
| 248 |
62.5 |
-- |
24.2 |
| 241 |
61.8 |
100.0 |
22.8 |
| 235 |
61.4 |
99.0 |
21.7 |
| 229 |
60.8 |
98.2 |
20.5 |
| 223 |
-- |
97.3 |
20.0 |
| 217 |
-- |
96.4 |
18.0 |
| 212 |
-- |
95.5 |
17.0 |
| 207 |
-- |
94.6 |
16.0 |
| 201 |
-- |
93.8 |
15.0 |
| 197 |
-- |
92.8 |
-- |
| 192 |
-- |
91.9 |
-- |
| 187 |
-- |
90.7 |
-- |
| 183 |
-- |
90.0 |
-- |
| 179 |
-- |
89.0 |
-- |
| 174 |
-- |
87.8 |
-- |
| 170 |
-- |
86.8 |
-- |
| 167 |
-- |
86.0 |
-- |
| 163 |
-- |
85.0 |
-- |
| 156 |
-- |
82.9 |
-- |
| 149 |
-- |
80.8 |
-- |
| 143 |
-- |
78.7 |
-- |
| 137 |
-- |
76.4 |
-- |
| 131 |
-- |
74.0 |
-- |
| 126 |
-- |
72.0 |
-- |
| 121 |
-- |
69.8 |
-- |
| 116 |
-- |
67.6 |
-- |
| 111 |
-- |
65.7 |
-- |
| |
|
|
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Blackalloy Company of America • 4773 Northgate Blvd. • Myrtle Beach, SC 29577
Tel: (843) 347-3390 • Fax: (843)293-0851 |
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