The McCormick 398328R3 is a genuine OEM flat washer designed for critical applications in International Harvester and McCormick agricultural equipment. This durable washer ensures proper spacing and load distribution, preventing loosening due to vibration. With an inner diameter of 20.6 mm, an outer diameter of 34.9 mm, and a thickness of 3.2 mm, it is a direct replacement part for maintaining the integrity and reliable operation of your machinery.