This needle roller cage assembly guides a single row of needle rollers within a JN-type cage, running without an inner or outer ring at a width of 17.0 mm. Net mass is 18.65 g, with a limiting speed of 17500 1/min and a reference speed of 9600 1/min, giving a defined thermal and mechanical speed reference for the design. Because the assembly has no rings of its own, the shaft and housing bore act directly as the rolling surfaces, keeping radial space to a minimum. The cage design (JN) locates the needle rollers evenly and reduces friction losses at speeds up to the limiting value, while the reference speed indicates the level suited for continuous operation. Lubrication must be supplied externally through grease or oil, matched to the running conditions and speed range required.