The paper presents the results of work aimed at further improvement of the designs of rolling cutter drilling tools. Based on the research and design-engineering works, several promising options of sliding bearings designs were proposed, which would significantly increase the reliability and efficiency of the support units of the roller drilling tools. The technical result of the work was the development of several new designs of supporting elements of rolling cutter drilling tools that make it possible to improve the efficiency of the tool’s work by increasing the operational lifetime of its supporting assemblies and simplifying their design. The essence of technical development lies in the complete abandonment of the use of ball lock bearings as a means of fixing the rolling cutter on the drilling bit leg axle with their further replacement by various fixing devices, that allow not only to simplify the technological process of manufacture of a rolling cutter drilling tool, but also to increase the reliability and operational lifetime of its bearings units. Equipment of a rolling cutter drilling tool with sliding bearings of a new design will not only increase the reliability and operational lifetime of the supporting structures, but also the efficiency of the rolling cutter drilling tool in general.