This inner ring is a separate raceway component designed to complete a needle roller bearing arrangement without an integrated inner ring. It has a cylindrical bore of 50.0 mm, a width of 25.0 mm, and a net mass of 0.163 kg. The cylindrical bore form allows a plain shaft fit without additional retaining features on the bore surface. Used together with a matching needle roller bearing that has no own inner ring, IR50X60X25-XL provides the hardened raceway surface required for the needle rollers to run on, extending shaft service life compared to running rollers directly on an unhardened shaft. As a bare ring, it carries no seals or integrated lubrication provision, so sealing and lubrication of the assembly must be handled by the surrounding bearing arrangement.