This inner ring is designed as a separate component that runs on the shaft seat in needle roller bearing assemblies without an integral inner race, providing a hardened cylindrical raceway for the rolling elements. It has a bore diameter of 8.0 mm, a width of 12.5 mm, and a net mass of 5.91 g, corresponding to the INA IR8X12X12,5-XL designation. Being a separate ring, it allows the raceway surface to be matched precisely to the shaft dimension while keeping the rolling element complement independent of shaft tolerances. The cylindrical form and compact width suit installations where axial space is limited and the inner ring must be fitted directly onto a ground shaft section, with lubrication and sealing provided by the surrounding bearing arrangement rather than the ring itself.