This paper describes investigation of bolt which is installation into the test station for bearings. Bolt is loaded with axial force, radial force, angular velocity and preload. Load consists of 45 load steps. It was calculated von Misses stress for each load step in the critical position then was calculate fatigue life of bolt. Fatigue life of part was determined with using theory of Palmgren-Miner linear damage accumulation.

The part of the results of this work was supported by grants VEGA 1/0795/16 and KEGA 017ŽU-4/2017.