This needle roller cage assembly guides a single row of needle rollers within a JN-type cage, giving the assembly a width of 17.0 mm and a net mass of 10.25 g. The limiting speed reaches 22900 1/min, with a reference speed of 14400 1/min, defining the rotational conditions the assembly can sustain. Since the cage assembly contains only rollers without an integral inner or outer ring, it must be run against a hardened and ground shaft and housing bore that form the raceways, keeping radial space minimal while allowing precise roller guidance. The K17X21X17-A/0-7 design suits applications where mounting space is limited and where the surrounding components already provide the running surfaces required for the needle rollers.