The McCormick 6665431A1 is a genuine OEM washer designed for a wide range of McCormick and Landini agricultural tractors. This essential component ensures proper spacing and load distribution in critical assemblies. It features an inner diameter of 10.5 mm, an outer diameter of 20 mm, and a thickness of 2 mm, weighing 0.002 kg. This washer is also cross-referenced as OEM part number 354020X1 for multiple other tractor brands including Massey Ferguson, Case IH, John Deere, and New Holland, ensuring broad compatibility and reliability.