This inner ring provides the inner raceway for a needle roller bearing assembly, machined as a separate cylindrical component to be fitted onto a shaft. The bore diameter is 55.0 mm and the width is 45.0 mm, with a net mass of 0.255 kg. As an XL version, it is dimensioned for use with needle roller and cage assemblies of extended series, giving a running surface for the rolling elements where the shaft itself is not hardened or ground to bearing tolerances. Using a separate inner ring allows the shaft to be manufactured without induction hardening or fine grinding, since the load-bearing surface is provided by the ring instead. It must be mounted with a matching needle roller and cage assembly and an outer ring or housing bore acting as the outer raceway, and requires grease or oil lubrication supplied through the surrounding bearing arrangement rather than the ring itself.