The Nut,square,5mm is the lowest priced item on this Cylinder Head schematic.
This part-list fiche shows all the components that make up the Cb600fa3 Hornet 2010 (a) France / Abs Cmf St 25k Cylinder Head .
Some items from this specific schematic: Band B,insulator, Head Assy,cylinde, Plug,spark(u27fer, Cover,starter.