Conference proceedings Series «SW-US Conference proceedings» 4 magnitudes of geometric microroughnesses, and in some cases even exceeds them. Failure to take these microroughnesses into account can lead to a distortion of the wear pattern and unreliable assessment of the performance of contacting pairs. In addition, it has been found that the critical loads for hardened surface layers of parts can be significantly reduced with an increase in their mutual slippage, which is taken into account by the introduction of a dynamic coefficient. Accounting for these features of the processes of friction and wear of contacting pairs makes it possible to refine the existing calculation methods and increase the strength of problematic friction pairs.