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Hertzian Pressure Calculations
The Hertzian pressure must not exceed the tensile strength of the mating steel profile in order to avoid depressions in the profile. By ensuring that the maximum pressure is less than 750N/mm2, such depressions should be prevented. The following table shows the approximate maximum static force on each bearing based on 0.31% of the bearing's surface area being in contact with the channel at any moment in time.
Bearing Ref. |
Diameter (mm) |
Circumference (mm) |
Contact Width (mm) |
Approx. Contact Area (mm2) |
Maximum Static Force between RADIAL roller & channel (N) |
Maximum Static Force between AXIAL roller & channel) (N) |
| 4.053 | 52.5 |
164.96 |
14 |
7.33 |
5499 |
1680 |
| 4.054 | 62.5 |
196.38 |
15 |
9.35 |
7014 |
3100 |
| 4.055 | 70.1 |
220.25 |
16 |
11.19 |
8392 |
3730 |
| 4.056 | 77.7 |
244.13 |
16 |
12.4 |
9301 |
3870 |
| 4.057 | 77.7 |
244.13 |
16 |
12.4 |
9301 |
2970 |
| 4.058 | 88.4 |
277.75 |
21 |
18.52 |
13889 |
6760 |
| 4.059 | 101.2 |
317.97 |
18 |
18.17 |
13629 |
5150 |
| 4.060 | 107.7 |
338.39 |
21 |
22.56 |
16922 |
5490 |
| 4.061 | 107.7 |
338.39 |
21 |
22.56 |
16922 |
7160 |
| 4.062 | 123 |
386.47 |
26 |
31.90 |
23927 |
10200 |
| 4.063 | 149 |
468.16 |
36 |
53.51 |
40133 |
17800 |
| 4.089 | 165 |
518.36 |
35 |
56.24 |
42180 |
13910 |
| 4.090 | 190 |
596.90 |
43 |
79.57 |
59677 |
19400 |
| 4.091 | 220 |
691.15 |
53 |
113.56 |
85170 |
28000 |
| 4.092 | 250 |
785.40 |
55 |
133.91 |
100432 |
33900 |
| 4.093 | 280 |
879.65 |
67 |
182.70 |
137027 |
46500 |
| 4.094 | 320 |
1005 |
77 |
239.97 |
179975 |
|
| 4.095 | 340 |
1068 |
81 |
268.21 |
201150 |
|
| 4.096 | 390 |
1125 |
111.5 |
423.50 |
317600 |