The Case IH 81900328 is a genuine OEM washer designed for critical applications in Case IH agricultural and construction equipment. With an inner diameter of 10.5 mm, an outer diameter of 20 mm, and a thickness of 2 mm, this precision-engineered washer ensures proper spacing and load distribution. It contributes to the reliable operation and longevity of components and is compatible with a wide range of Case IH tractors and other machinery, maintaining original equipment specifications.