This component is a cylindrical inner ring designed for use with needle roller bearings, providing the running surface for the rolling elements against the shaft. It has a bore diameter of 35.0 mm, an outer measurement of 42 mm and a width of 20.5 mm, with a net mass of 65.9 g. The XL execution indicates an extended inner ring design. As a separate inner ring, IR35X42X20,5-XL is used to complete a separable bearing arrangement where the ring must be fitted onto the shaft independently of the outer bearing components. This allows the shaft-side element to be mounted, aligned and replaced separately, which simplifies assembly and maintenance where the inner ring runs directly on a shaft seat matched to the 35.0 mm bore.