This needle roller cage assembly is a single row K-type unit consisting of needle rollers guided by a JN cage, without an integral inner or outer ring, requiring a hardened and ground shaft and housing bore as raceways. Width is 20.0 mm and net mass is 18.7 g. The limiting speed is rated at 20900 1/min, with a reference speed of 11400 1/min. The absence of integrated rings keeps radial section height low, allowing the assembly to be fitted directly onto the shaft and into the housing bore where the mating surfaces serve as raceways for the needle rollers. The JN cage guides and retains the needle rollers, maintaining even spacing and enabling operation up to the stated limiting speed. As a bearing element only, it depends on correctly toleranced and hardened mating surfaces and adequate lubrication of the raceways to achieve the intended running characteristics at the reference speed.