An exact calculation of the lifespan of a rod end or spherical-plain bearing is not possible because it is subject to a multitude of different external influencing factors. These factors are additional difficult to determine. However, the following calculation module gives a considerable accurate value for the lifespan. This has been proven over the years in various test procedures by independent institutions according to the corresponding DIN. However, such external factors as impacts, soiling, vibrations, etc. could not be taken into consideration.