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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