The McCormick 6637084A1 Collar is an authentic OEM replacement component specifically designed for various McCormick X-series agricultural tractors. This critical part ensures secure fastening and proper alignment within the machinery, contributing to the overall operational integrity and longevity of the system. Manufactured to McCormick's rigorous quality standards, it provides reliable performance for models including the X4.20, X5.35, X6.420, X7.440, and X8.660 series.