The Nut (5h0) is the lowest priced item on this Crankshaft - Piston schematic.
A sample from the products for the Crankshaft - Piston include: Gear, Drive, Key Woodruff 146115450000, Piston Ring Set (1.00mm O/s), O-ring (538).
Of all the components used in this assembly the Crankshaft Assy is the most expensive.