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 Hardness and Crushing Load |
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Hardness and Crushing Load
| Size |
CHROME STEEL BALL |
CARBON STEEL BALL |
| inch |
mm |
Surface Hardness |
Crushing Load(Kg) |
Surface Hardness |
Crushing Load(Kg) |
Case Depth (mm) |
| |
0.5 |
HV 760
~
HV 880 |
|
HV 700
~
HV 880 |
|
0.1 |
| 1/32" |
0.794 |
|
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1.0 |
|
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| 1/16" |
1.588 |
180 |
170 |
0.4 |
| |
2.0 |
310 |
250 |
| 3/32" |
2.381 |
380 |
300 |
0.5 |
| |
2.5 |
390 |
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3.0 |
600 |
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| 1/8" |
3.175 |
55.0~61.0 |
700 |
56.0~62.0 |
500 |
0.6 |
| 5/32" |
3.969 |
56.0~62.0 |
990 |
57.0~61.0 |
800 |
| |
4.0 |
990 |
? |
| 3/16" |
4.762 |
57.0~62.0 |
1500 |
58.0~64.0 |
900 |
0.8 |
| |
5.0 |
1600 |
900 |
| 7/32" |
5.56 |
58.0~63.0 |
1800 |
59.0~65.0 |
1200 |
0.9 |
| |
6.0 |
58.0~63.0 |
1950 |
1200 |
| 1/4" |
6.350 |
58.0~64.0 |
2280 |
1600 |
1.1 |
| 5/16" |
7.938 |
60.0~65.0 |
4100 |
60.0~66.0 |
2400 |
| 3/8" |
9.525 |
60.0~65.0 |
5900 |
3000 |
1.4 |
| 7/16" |
11.112 |
60.5~65.0 |
6000 |
3500 |
1.7 |
| 1/2" |
12.7 |
6000 |
4500 |
1.8 |
| 5/8" |
15.875 |
61.0~66.0 |
|
62.0~66.0 |
|
1.9 |
| 3/4" |
19.050 |
|
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2.0 |
| 7/8" |
22.225 |
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| 1" |
25.4 |
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Note :
- Hardness readings taken on spherical are subject to the correction shown on Table 1.
- Curshing load shown above is minimum level. Adjustment can be made to meet customer's specifications.
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| Table 1: Hardness Correction Table |
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| Correction to be added to rockwell "C" readings obtained on spherical surfaces. |
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Metric Sizes
| RC Readings |
Ball Diameter |
| 6mm |
8mm |
10mm |
12mm |
15mm |
20mm |
25mm |
| 20 |
12.8 |
9.3 |
7.6 |
6.6 |
5.2 |
4.0 |
3.2 |
| 25 |
11.7 |
8.4 |
6.9 |
5.9 |
4.6 |
3.5 |
2.8 |
| 30 |
10.5 |
7.5 |
6.1 |
5.2 |
4.1 |
3.1 |
2.4 |
| 35 |
9.4 |
6.6 |
5.4 |
4.6 |
3.6 |
2.7 |
2.1 |
| 40 |
8.0 |
5.7 |
4.5 |
3.8 |
3.0 |
2.2 |
1.8 |
| 45 |
6.7 |
4.9 |
3.8 |
3.2 |
2.5 |
1.8 |
1.4 |
| 50 |
5.5 |
4.0 |
3.0 |
2.6 |
2.0 |
1.4 |
1.1 |
| 55 |
4.3 |
3.1 |
2.3 |
1.9 |
1.5 |
1.0 |
0.8 |
| 60 |
3.0 |
2.2 |
1.7 |
1.2 |
1.0 |
0.6 |
0.4 |
| 65 |
1.9 |
1.9 |
0.9 |
0.6 |
0.4 |
0.2 |
0.1 |
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Inch Sizes
| RC Readings |
Ball Diameter |
| 1/4" |
5/16" |
3/8" |
1/2" |
5/8" |
3/4" |
1" |
| 20 |
12.1 |
9.3 |
7.7 |
6.1 |
4.9 |
4.1 |
3.1 |
| 25 |
11.0 |
8.4 |
7.0 |
5.5 |
4.4 |
3.7 |
2.7 |
| 30 |
9.8 |
7.5 |
6.2 |
4.9 |
3.9 |
3.2 |
2.4 |
| 35 |
8.6 |
6.6 |
5.5 |
4.3 |
3.4 |
2.8 |
2.1 |
| 40 |
7.5 |
5.7 |
4.7 |
3.6 |
2.9 |
2.4 |
1.7 |
| 45 |
6.3 |
4.9 |
4.0 |
3.0 |
2.4 |
1.9 |
1.4 |
| 50 |
5.2 |
4.0 |
3.2 |
2.4 |
1.9 |
1.5 |
1.1 |
| 55 |
4.1 |
3.1 |
2.5 |
1.8 |
1.4 |
1.1 |
0.8 |
| 60 |
2.9 |
2.2 |
1.8 |
1.2 |
0.9 |
0.7 |
0.4 |
| 65 |
1.8 |
1.3 |
1.0 |
0.5 |
0.3 |
0.2 |
0.1 |
Hardness readings taken on spherical surfaces are subject to the corrections shown in Table 1. |
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