This is a cylindrical inner ring, designed as a separate component for needle roller bearings without an integrated inner ring, allowing the raceway to run directly on the shaft when this ring is not used, or providing a hardened, ground seat when it is fitted. The bore diameter is 40.0 mm, width is 20.0 mm, and net mass is 0.051 kg. The XL designation indicates an extended series inner ring with reinforced load-carrying cross-section compared to the standard series. Because it is supplied as an individual ring, it can be mounted directly on the shaft to create the inner raceway for the mating needle roller and cage assembly, giving precise control over the running accuracy of the bearing arrangement. Fitting practice and shaft tolerance should match the ring's bore diameter to maintain correct internal clearance and raceway geometry.