This camshaft nut is intended for use in engines of Citroën vehicles from the specified series. The nut provides firm axial retention of the camshaft and supports correct alignment of rotating components. Its metric thread size and pitch allow installation in the existing engine block. The material is suitable for the mechanical loads and temperatures in the engine compartment. The shape of the nut allows use with standard tools. The camshaft nut supports reliable valve train operation and limits unwanted play on the camshaft during running conditions, which helps maintain stable timing between crankshaft and camshaft movement.