The Fiat 440441 locking ring is an original equipment manufacturer (OEM) part designed for a wide range of Fiat agricultural tractors. This essential component, with an outer diameter of 70 mm, an inner diameter of 50 mm, and a thickness of 2 mm, provides secure fastening and prevents movement of critical parts within the machinery. It ensures reliable operation and maintains the integrity of assemblies in models such as Fiat 450, 480, 500, 540, 550, 600, 640, 650, 750, 850, 900, 950, 1000, 1180, 1280, 1380, 1580, and 1880 series tractors, including their DT (four-wheel drive) variants.