This is a separate cylindrical inner ring designed as a mating component for needle roller bearings without an integrated inner ring. Bore diameter is 140.0 mm, width 50.0 mm, and net mass is 1.78 kg. The XL suffix indicates a reinforced cross-section version of the ring. Using a hardened, ground inner ring in place of a shaft running surface allows the needle roller bearing to operate on a shaft that does not meet the hardness and surface finish requirements needed for direct roller contact. The cylindrical bore and matched dimensions to the corresponding needle roller bearing bore diameter ensure correct radial fit and running accuracy. Lubrication (grease or oil) and sealing arrangement must be selected according to the needle roller bearing used together with this ring, as the ring itself does not include sealing or lubrication features.