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Equivalent Static Load

The equivalent static load P0 is a theoretical value (according to ISO 76). It is a radial load for radial bearings and an axial and centrical load for thrust bearings. P0 causes the same stress at the center of the most heavily pressurized contact area of the rolling element or raceway as the actual load combination.

Formula 10

P0 equivalent static load [N]
Fr radial load [N]
Fa axial load [N]
X0 radial factor
Y0 thrust factor

In the following three tables, the calculation factors X0 and Y0 are summarized for single and double row deep groove ball bearings and angular contact ball bearings.

Table 5: Calculation factors X0 and Y0 for single and double row radial ball bearings
Table 5: Calculation factors X0 and Y0 for single and double row radial ball bearings
* P0 is always ≥ Fr otherwise P0 = Fr instead of Formula 10


Table 6: Calculation factors X0 and Y0 for single row angular contact ball bearings
Table 6: Calculation factors X0 and Y0 for single row angular contact ball bearings
* P0 is always ≥ Fr otherwise P0 = Fr instead of Formula 10


Table 7: Calculation factors X0 and Y0 for double row angular contact ball bearings
Table 7: Calculation factors X0 and Y0 for double row angular contact ball bearings
* for all load conditions


Static Load Safety Factor

The static load safety factor s0 is the ratio between the basic static load rating C0 and the highest occurring load P0 (according to ISO 76).

Formula 11

C0 basic static load rating [N]
P0 equivalent static bearing load [N]
s0 static load safety factor

For our bearing types, the basic static load rating C0 for single and double row deep groove ball bearings as well as single and double row angular contact ball bearings are listed in the product tables.

The basic static load ratings listed in these tables are based on our standard bearing steel and our standard heat treatment. Load ratings of alternative bearing steels can be obtained from us upon request.

Guideline values based on experience are given in Table 8 for the static load safety factor s0 for ball bearings for various types of requirements with respect to smooth running.

Table 8: Factor of safety for static loading
Table 8: Factor of safety for static loading

At elevated temperatures, the basic static load rating is reduced.

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