The McCormick 6605688A2 is a genuine OEM thickness washer designed for various McCormick X-series agricultural tractors. This essential component ensures proper spacing and alignment within machinery assemblies, contributing to optimal performance and longevity. It is compatible with models such as the X4.060, X4.070, X4.080, X4.090, X5.085, X5.095, X5.105, X5.115, X6.420, X6.430, X6.440, X7.440, X7.450, X7.460, X7.650, X7.660, X7.670, X7.680, X7.690, X8.660, X8.670, and X8.680.