This seating washer is a supporting component used together with a rolling bearing, providing a flat mounting surface between the bearing and the adjacent housing or shaft element. Its net mass is 0.02 kg, indicating a small, thin-profile design intended for precise axial positioning rather than load-bearing itself. The washer compensates for minor surface irregularities and helps distribute contact pressure evenly across the bearing seat, supporting stable alignment during assembly. It contains no separate lubrication or sealing system, as its function is purely mechanical positioning within the bearing arrangement designated U204.