The McCormick 6605086A1 is a genuine OEM washer designed for various McCormick and Landini tractor models. This flat washer, with an inner diameter of 10.5 mm, an outer diameter of 20 mm, and a thickness of 2 mm, provides essential support and even load distribution for bolted connections, preventing loosening and wear. It is a critical component for maintaining the integrity of machinery assemblies in models such as the McCormick X4, X5, X6, X7, X8 series and various Landini 4, 5, 6, 7, and 8 series tractors.