This needle roller cage assembly transfers radial load through a single row of needles guided by a JN cage, without its own inner or outer ring, so the shaft and housing surfaces act as the raceways. Width is 27.0 mm, net mass 47.68 g, limiting speed 11500 1/min, reference speed 6500 1/min. Symbol: K40X45X27-B/0-7. Since the assembly has no rings, radial section height stays minimal, which suits mounting positions where shaft and housing bore are machined to the required raceway hardness and tolerance. The JN cage keeps the needles evenly spaced and guided during rotation, supporting operation up to the stated limiting speed, while the reference speed value reflects thermally safe continuous running under normal lubrication. Running surfaces need adequate hardening and lubrication with grease or oil to reach the rated speed values.