The problems of the creation of composite polymer-based materials with theuse of nanosized molybdenum and tungsten fillers with the particle size ofless than 10 nm are considered. The copolymer of formaldehyde and dioxolane(CFD) and the polyphenylene sulphide (PPS) are chosen as polymeric matrixes.A comparative analysis of the tribological properties of composite materialswith fine nanosized fillers (5-10 nm) and nanosized analogues (100-200) ismade. It is determined that the use of nanosized isotropic structure Mofillers leads to improved wear-resistance up to three times for CFD-basedcomposites and up to four times for PPS-based. The highest hardness valueswere observed while using isotropic nanosized tungsten fillers. Thenanosized crystalline fillers also give positive results, but the biggersized fillers decrease the polymer hardness characteristics comparativelynanosize isotropic analogues.