The significance of thermal contact resistance on a bearing steel surface and its application in the analysis of heat flow through layers has been discussed. In the present study, it is considered that the surface roughness and the interface temperature vary to estimate effective thermal conductivity of the bearing model under steady-state and insulated conditions. Surface roughness was considered in the range of 2.37-7.16mm, and thermal contact properties of the hardened steels were studied under dry and lubricated conditions. These results help to predict temperature distributions of the bearing using SolidWorks2011 (Dassault Systemes SolidWorks Concord, MA, USA).