This genuine Fiat FT5107017 nut is an original equipment manufacturer (OEM) part, featuring an M14x1.5 thread. It has a height of 12.5 mm and requires a 22 mm wrench for installation. Designed for durability and precise fit, this nut is compatible with a wide range of Fiat agricultural tractor models including the 450, 480, 500, 540, 550, 600, 640, 650, 666, 750, 766, 850, 880, 900, 950, 980, 1000, 1180, 1280, 1380, 1580, and 1880 series, along with their DT and S variants.