This inner ring provides the seat for needle roller bearings that operate as separate raceway systems, allowing the rolling elements to run directly on a hardened surface matched to shaft dimensions. It is precision machined to DIN 620, with a bore diameter of 10.0 mm, width of 12.0 mm, and a net mass of 0.007 kg. A lubrication hole is incorporated into the ring body, allowing grease or oil to reach the raceway during operation without dismounting the assembly. Because the raceway is machined as a separate component, it can be replaced independently of the outer bearing elements, which simplifies maintenance where wear occurs primarily on the inner running surface. The precision-ground bore ensures a defined fit on the shaft, supporting accurate radial guidance and consistent rolling contact geometry across the 12.0 mm width.