The Case-IH 81815991 is a genuine OEM flat washer designed for use in a wide range of Case-IH agricultural and construction machinery. This essential component helps distribute load, prevent loosening, and provide proper spacing within mechanical assemblies. With an inner diameter of 10.32 mm, an outer diameter of 20.64 mm, and a thickness of 1.59 mm, this washer ensures reliable performance and fitment in demanding environments.