This track roller guides motion along a running surface using a single row of self-retaining balls positioned between a particularly thick-walled outer ring and an inner ring. Axial guidance of the outer ring is provided by the balls themselves, eliminating the need for a separate flange. Bore diameter is 25.0 mm, outside diameter 62.0 mm, height 15.0 mm, and net mass is 0.23 kg. Sealing type 2RSR uses lip seals on both sides, combining axial and radial sealing action. The thick-walled outer ring allows the roller to carry direct contact loads from a track surface while the internal ball set maintains axial positioning without external guiding elements. The double lip seal arrangement protects the internal ball and cage assembly from contaminants entering from either the side or the running surface, supporting continuous rolling contact operation where the outer ring itself acts as the rolling element against the mating track.