This is a separate cylindrical inner ring designed to be mounted on a shaft as part of a needle roller bearing assembly with a separable design. The bore diameter is 12.0 mm, width is 12.0 mm, and the ring has a net mass of 5.6 g. Its cylindrical bore allows direct fitting onto a shaft without an additional sleeve. As a component part, it is intended for use together with a matching needle roller and cage assembly or outer ring, replacing a worn or damaged inner ring without exchanging the complete bearing. Because it is supplied as a separate part, correct fit tolerances on the shaft must be maintained to ensure proper radial location and load transfer.