The McCormick 4212951M1 is a genuine OEM washer designed for use in various McCormick X-series agricultural tractors, including X4, X5, X6, X7, and X8 models. This essential component ensures proper spacing and secure fastening of parts, preventing loosening due to vibration. With an inner diameter of 18 mm, an outer diameter of 30 mm, and a thickness of 2 mm, it meets original equipment specifications for reliable performance and durability.