NUT M12x1.25 for CF400, CF500, CF600, CF800, UF500, UF800, ZF500, ZF800 ATV and UTV models. 0180-331009-0020.Compatible with 400, 500, 600, 800; UFORCE 500, 800; ZFORCE 500, 800; X5, X6, X8; and other models listed in the compatibility range.Designed to replace the nut used in crankshaft, engine, or drivetrain assemblies where an M12x1.25 thread specification is required.Fits applications requiring secure fastening of rotating components in side-by-side and all-terrain vehicles.