The McCormick 6521404M1 is a genuine OEM piston ring designed for a wide range of McCormick agricultural tractors, including models in the CX, MC, MTX, XTX, and ZTX series. This essential engine component ensures proper compression and oil control within the cylinder. Featuring a 100mm bore diameter and 3mm thickness, it is engineered to meet original equipment specifications for optimal engine performance and longevity. Cross-referenced with Perkins and Massey Ferguson equivalent part numbers, this piston ring is a critical component for engine maintenance and repair.