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The roller/ball bearing plays a crucial role in the power transmission of high-speed machines used in industrial applications. The inadequate lubricant at the contacting surfaces may cause bearing failure and lead to financial misfortune. Effective lubrication at the contacting surface is the only criteria to obtain significant bearing performance and enhance the life of the bearing. Therefore, in this paper, efforts have been carried out to enhance the tribological and thermo-physical properties of lithium by adding nanomaterials. Multi-walled carbon nanotubes (MWCNTs), zinc oxide (ZnO), and nanoboric acid (nBA) nanomaterials were used as an additive. The 52100 steel ball specimens were considered in the four-ball tribometer to analyze the friction coefficient, lubricant film strength, wear scar diameter (WSD), wear volume, and frictional power loss parameters. In addition, the thermal conductivity of base grease and …