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BALL HARDNESS CORRECTIONS FOR
CURATURES
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 The table below is useful for
converting Rockwell 'C' scale readings taken on ball surface es to
equivalent value applicable to flat surfaces. Hardness reading of
balls are affected by the curvature and hardness level of the ball.
Because of these factors, corrections are necessarily added to the
as-read hardness. For ball size and hardness values shall be
interpolated.
|
|
BALL
DIAMETERS |
ROCKWELL
'C' READINGS |
| mm |
55 |
56 |
57 |
58 |
59 |
60 |
61 |
62 |
63 |
64 |
65 |
| 3.175 |
6.1 |
5.7 |
5.4 |
5.1 |
4.8 |
4.5 |
4.2 |
4.0 |
3.8 |
3.6 |
3.4 |
| 3.968 |
5.6 |
5.3 |
5.0 |
4.7 |
4.4 |
4.1 |
3.8 |
3.6 |
3.4 |
3.2 |
3.0 |
| 4.762 |
5.1 |
4.7 |
4.3 |
4.0 |
3.8 |
3.6 |
3.4 |
3.2 |
3.0 |
2.8 |
2.5 |
| 5.562 |
4.6 |
4.3 |
4.0 |
3.7 |
3.5 |
3.3 |
3.1 |
2.9 |
2.7 |
2.5 |
2.3 |
| 6.350 |
4.1 |
3.8 |
3.6 |
3.3 |
3.1 |
2.9 |
2.7 |
2.5 |
2.3 |
2.1 |
1.8 |
| 7 |
3.7 |
3.4 |
3.2 |
3.0 |
2.8 |
2.6 |
2.4 |
2.2 |
2.0 |
1.8 |
16 |
| 7.938 |
3.1 |
2.9 |
2.7 |
2.6 |
2.4 |
2.2 |
2.0 |
1.9 |
1.7 |
1.5 |
1.3 |
| 8 |
3.1 |
2.9 |
2.7 |
2.6 |
2.4 |
2.2 |
2.0 |
1.5 |
1.7 |
1.5 |
1.3 |
| 9 |
2.7 |
2.5 |
2.4 |
2.2 |
2.0 |
1.9 |
1.7 |
1.4 |
1.4 |
1.2 |
1.1 |
| 9.525 |
2.5 |
2.3 |
2.2 |
2.0 |
1.9 |
1.8 |
1.6 |
1.3 |
1.2 |
1.1 |
1.0 |
| 10 |
2.4 |
2.2 |
2.0 |
1.9 |
1.8 |
1.7 |
1.5 |
1.1 |
1.1 |
1.0 |
0.9 |
| 11 |
2.1 |
2.0 |
1.8 |
1.5 |
1.6 |
1.5 |
1.3 |
1.0 |
0.9 |
0.8 |
0.7 |
| 12 |
1.9 |
1.7 |
1.6 |
1.5 |
1.4 |
1.3 |
1.1 |
0.9 |
0.8 |
0.7 |
0.6 |
| 12.700 |
1.8 |
1.7 |
1.6 |
1.5 |
1.4 |
1.2 |
1.0 |
0.9 |
0.7 |
0.6 |
0.5 |
| 13 |
1.8 |
1.7 |
1.6 |
1.5 |
1.4 |
1.2 |
1.0 |
0.8 |
0.7 |
0.6 |
0.5 |
| 14 |
1.6 |
1.5 |
1.4 |
1.3 |
1.2 |
1.0 |
0.9 |
0.7 |
0.6 |
0.5 |
0.4 |
| 15 |
1.5 |
1.4 |
1.3 |
1.2 |
1.1 |
0.9 |
0.8 |
0.7 |
0.5 |
0.4 |
0.3 |
| 15.875 |
1.4 |
1.3 |
1.2 |
1.1 |
1.0 |
0.9 |
0.8 |
0.7 |
0.5 |
0.4 |
0.3 |
| 16 |
1.4 |
1.3 |
1.2 |
1.1 |
1.0 |
0.9 |
0.8 |
0.6 |
0.5 |
0.4 |
0.3 |
| 17 |
1.3 |
1.2 |
1.1 |
1.0 |
0.9 |
0.8 |
0.7 |
0.5 |
0.4 |
0.3 |
0.2 |
| 18 |
1.2 |
1.1 |
1.0 |
0.9 |
0.8 |
0.7 |
0.6 |
0.5 |
0.4 |
0.3 |
0.2 |
| 19 |
1.1 |
1.0 |
0.9 |
0.8 |
0.7 |
0.7 |
0.6 |
0.5 |
0.4 |
0.3 |
0.2 |
| 19.050 |
1.1 |
1.1 |
1.0 |
0.9 |
0.8 |
0.7 |
0.6 |
0.5 |
0.4 |
0.3 |
0.2 |
| 20 |
1.0 |
1.0 |
0.9 |
0.8 |
0.8 |
0.7 |
0.6 |
0.5 |
0.4 |
0.3 |
0.2 |
| 25.400 |
0.8 |
0.8 |
0.7 |
0.6 |
0.5 |
0.4 |
0.4 |
0.3 |
0.3 |
0.2 |
0.1 |
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