Depending on the application and the sliding material, the permissible wear or the permissible increase in friction will be different.
This means that under the same operating conditions the service life, which can be obtained in practice, will be different. This is due to the fact that depending on the applica-tion, the bearing has to meet different demands. It has also been proven that the service life, which will be obtained in practice under identical operating conditions, varies. This applies to field as well as laboratory tests. The effective or actual service life is largely determined by the actual operating conditions. Apart from magnitude and type of load, several other factors such as contamination, corrosion, high frequency load and movement cycles, shocks, etc. have to be considered. Some of these factors may only be evaluated with extreme difficulty.
The nominal service life is an approx-imate value only, which will be achieved or exceeded by the majority of bearings.