This track roller runs on a particularly thick-walled outer ring guided axially by the internal ball complement, combined with a single row of balls, a cage and an inner ring. Bore diameter is 6.0 mm, outside diameter 19.0 mm, height 6.0 mm, and net mass is 0.008 kg. Sealing is provided on both sides by lip seals, designation 2RSR, giving both axial and radial sealing action. The self-retaining ball and cage assembly allows the outer ring to be axially guided directly by the balls, so the roller can carry the guiding load of a track surface without a separate cage retention feature failing under load. The double lip seal keeps contaminants out on both faces while retaining internal lubrication, making the bearing suited to direct rolling contact against a track or guide surface where compact bore and outside diameter dimensions are required.