The McCormick 6640440A1 piston is a genuine OEM component designed for various McCormick and Case IH agricultural machinery. This high-quality piston features a 100mm diameter, 100.5mm height, and a 35mm piston pin bore diameter, ensuring precise fit and optimal engine performance. It is compatible with McCormick CX, MC, MTX, X6, X7, and XTX series tractors, as well as Case IH MXM series tractors, which often utilize Perkins 1004.40T, 1004.40TA, 1004.42, 1006.60T, and 1006.60TA engines. This critical engine part is essential for maintaining engine compression and efficiency.