This needle roller cage assembly consists of a single row of needle rollers guided in a JN cage, without an integral inner or outer ring, requiring the adjacent shaft and housing bore to serve as the running surfaces. Width is 24.0 mm and net mass 173.68 g. The limiting speed is rated at 3950 1/min, with a reference speed of 2650 1/min. Because the rolling elements run directly on the shaft and housing, radial section height stays low while full needle complement contact area is maintained, giving high load capacity for the available space. The open cage design allows lubrication directly onto the raceway surfaces and permits inspection of the rollers, but requires that the mating shaft and bore be hardened and ground to the tolerances needed for direct rolling contact. Symbol K120X127X24-A/0-7 designates the specific bore, outside diameter, and width combination together with the JN cage execution.