This is a separate cylindrical inner ring designed to work as a mating component with a needle roller bearing without an inner ring, forming a complete radial bearing arrangement. It has a bore diameter of 17.0 mm and a width of 20.0 mm, with a net mass of 0.018 kg. The cylindrical bore allows mounting directly on a shaft, providing a hardened and precision-ground raceway surface for the rolling elements. Using a separate inner ring of this type allows the raceway surface to be replaced independently of the outer bearing components, which is useful when the shaft itself is not hardened or ground to bearing-quality tolerances. Since it is supplied as a standalone ring without seals or integrated lubrication, the surrounding housing and bearing selection determine the sealing and lubrication method for the complete assembly.