This needle roller bearing carries the full complement of needle rollers guided directly against the housing bore, with an outside diameter of 50.0 mm and a net mass of 0.124 kg. The standard cage keeps the rollers evenly spaced and running true, supporting a limiting speed of 11400 1/min and a reference speed of 6700 1/min. As part of the NK light series, the radial section stays compact relative to the load-carrying rollers. The absence of an inner ring in this configuration means the shaft seat must be hardened and ground to serve as the raceway, so mounting requires a shaft finished to the tolerance and surface hardness the rollers need to run on directly. The standard cage design suits general radial loading where a compact envelope and low radial height are needed, and the specified limiting and reference speeds define the practical operating range for continuous running under adequate lubrication.