The McCormick 3686742A1 is an authentic OEM washer designed for critical applications across a wide range of McCormick agricultural equipment. This flat washer provides essential load distribution and prevents loosening of threaded fasteners, contributing to the structural integrity and reliable operation of your machinery. Manufactured to precise specifications, it ensures optimal fit and and performance in compatible McCormick X4, X5, X6, X7, X8, CX, MC, MTX, TTX, XTX, and ZTX series tractors.