The McCormick 378985R2 washer is a critical component designed for various agricultural and industrial applications. This genuine OEM washer ensures proper spacing and load distribution, preventing loosening and wear in machinery assemblies. Manufactured to precise specifications, it provides reliable performance and durability for a wide range of McCormick, International Harvester, and Case IH tractors, including models 400, 450, 560, 660, 706, 756, 806, 826, 856, 1026, 1066, 1206, 1256, 1456, 1466, 1468, 1566, 1568, 2706, 2756, 2806, 2826, 2856, 4100, 4156, 4166, and 4186.