The design of rolling bearing assemblies, like shaft bearings, requires specialized engineering knowledge. Mounting bearings correctly on shafts and in housings is crucial for their efficiency and durability. The condition of the roller surface of the shaft pin and housing affects how well the bearing works. Researchers used numerical analyses to study the stress in the contact area of the assembly components. They found that specific shape faults, bearings, and deviation values can impact the performance of the bearings.