The component with the lowest price in the REAR HUB schematic is the Pin-cotter,4.0x35.
A sample from the products for the Rear Hub include: Pin-cotter,4.0x35, Collar,rear Axle,l=17, Sprocket-hub,43t, Circlip,47m/m.
This REAR HUB assembly utilises eight Stud, 8x16(s) - the highest specified component.