This component provides the inner raceway for a needle roller bearing arrangement without an integrated inner ring, allowing the assembly to be mounted directly on a shaft. It has a cylindrical bore of 30.0 mm, a width of 18.0 mm, and a net mass of 50.2 g. The XL design corresponds to a reinforced load rating version of this inner ring type. Using a separate inner ring such as IR30X37X18-XL allows the shaft surface to be protected from direct rolling contact, since the hardened raceway takes the load instead. This is relevant where the shaft itself is not hardened or ground to bearing-raceway tolerances, as fitting this ring restores the correct running surface and dimensional accuracy needed for the needle roller complement.