This component is a separate cylindrical inner ring designed for use with needle roller bearings that require a mating inner raceway on the shaft seat. It has a bore diameter of 75.0 mm, a width of 25.0 mm, and a net mass of 0.237 kg. The cylindrical bore allows direct mounting on a plain shaft without additional adapter sleeves. Being sold as a separate ring, it is intended for assemblies where the shaft itself does not provide a hardened raceway surface, allowing the needle roller complement to run on a precision-ground steel surface instead of directly on the shaft. This setup depends on correct fit selection between the ring bore and shaft to maintain proper internal clearance and running accuracy.