The John Deere N163911 is a genuine OEM concave washer designed for use in various John Deere agricultural machinery, including combines, cotton pickers, forage harvesters, and windrowers. This washer plays a crucial role in securing the concave assembly, providing proper spacing and reducing wear. Manufactured to John Deere's specifications, it ensures optimal performance and durability in demanding operational conditions. With an outside diameter of 38.1 mm, an inside diameter of 20.62 mm, and a thickness of 3.175 mm, this washer is engineered for precise fit and long-lasting reliability.