Of all the components that make up this Camshaft / Valve the Nut Hex 6mm has the lowest price.
The twenty-seven Cb550k 1978 Usa Camshaft / Valve component parts are all listed in this schematic.
A sample from the products for the Camshaft / Valve include: Screw,tapet, Cotter, Valve, Camshaft, Nut,hex 6mm.