This component provides the inner raceway for a needle roller bearing assembly, supplied as a separate cylindrical inner ring to be combined with the corresponding outer bearing element. It has a bore diameter of 10.0 mm, a width of 13.0 mm, and a net mass of 0.007 kg, matching the XL series dimensions for use with needle roller and cage assemblies of the same bore size. Using a separate inner ring allows the shaft seat to run directly on a hardened raceway surface instead of the shaft material itself, which supports higher load capacity and reduces wear at the rolling contact. Since it is supplied without integrated sealing or lubrication, the mounting arrangement, fit tolerance, and lubricant selection must be handled separately, in accordance with the mating needle roller and cage or full complement bearing design it is intended to complete.