This inner ring provides the inner raceway for a needle roller bearing arrangement, machined to DIN 620 accuracy with a bore diameter of 50.0 mm, width of 20.0 mm and net mass of 0.129 kg. A lubrication hole is incorporated into the ring body, allowing grease or oil to be fed directly to the raceway during operation. The precision-machined surface finish and dimensional accuracy make this ring suitable for use as a mating component on a shaft where a separate hardened raceway is required. The lubrication hole supports relubrication without dismantling the assembly, which is relevant where the ring remains mounted on the shaft for extended service periods. As a separate inner ring (IS1 design), it is intended to be combined with a matching outer bearing component rather than used as a complete bearing on its own.