This inner ring provides a cylindrical bore surface of 25.0 mm diameter, designed as a separate component for use with a matching needle roller and outer ring assembly. The width is 18.0 mm and the net mass is 30.0 g. As a separate inner ring, it allows the raceway to be replaced or matched independently of the outer bearing components. Since the ring is supplied as an individual part without integrated sealing, it must be paired with a compatible needle roller bearing outer assembly to form a complete rolling bearing arrangement. The cylindrical bore design allows mounting directly onto a shaft, with the fit and running accuracy of the assembly depending on the selected outer ring and roller set used alongside this inner ring.