This needle roller cage assembly guides a single row of needle rollers within a 13.0 mm width, using a JN cage to keep the rolling elements evenly spaced and correctly aligned in the housing bore. Net mass is 18.73 g, with a limiting speed of 11000 1/min and a reference speed of 6400 1/min, indicating the thermal and mechanical operating range under continuous rotation. Since the assembly consists only of the cage and needle rollers, it requires a hardened and ground shaft and housing bore to form the complete bearing arrangement, allowing a compact radial section where full complement rollers are not needed. The design suits applications where radial space is limited and running accuracy depends on the mating surfaces, with lubrication supplied externally as grease or oil according to the operating speed and load conditions.