The McCormick 6517870M91 is a genuine OEM brake disk designed for various McCormick and Massey Ferguson agricultural tractors. This essential component ensures reliable braking performance. With an outer diameter of 150 mm, an inner diameter of 85 mm, and a thickness of 4 mm, it is engineered for precise fitment and durability. Compatible with McCormick C, CX, MC, MTX, and XTX series, as well as Massey Ferguson 5400, 6400, 7400, and 8400 series tractors.