This needle roller cage assembly guides a single row of needle rollers within a JN-type cage, running directly on the shaft and housing bore surfaces. Width is 17.0 mm and net mass is 11.8 g, allowing a limiting speed of 21300 1/min and a reference speed of 12500 1/min under normal operating conditions. The absence of inner and outer rings keeps radial section height minimal, so this cage assembly suits applications requiring high radial load capacity within tight installation space where the shaft and housing surfaces are hardened and ground to serve as raceways. The JN cage design guides the needle rollers accurately, and lubrication must be supplied externally, as this component includes no integrated sealing or grease reservoir.