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The work presents the results of the following researches: – samples of gears made of 18KhGT steel (determination of the thickness of the cemented layer, distribution of microhardness over the thickness of the cemented layer, measurement of the surface and core hardness, analysis of the microstructure of the cemented layer and core); – suspensions of grades VAP-2, VAP-4 and VFP-5 (determination of the conditional viscosity, mass fraction of nonvolatile substances, coating impact strength, coating elasticity in ben-ding, coating adhesion, hardness and density). There has been performed a comparative analysis of the tribological characteristics of solid lubricating coatings of the VAP-2, VAP-4 and VFP-5 grades on samples of steel 18KhGT after carburizing and hardening heat treatment.