The lowest price component in this Rear Hub/brake/chain parts-list fiche is the Pin-cotter,4.0x35.
Some items from this specific schematic: Bearing-ball,#6305c3, Chain,drive,ek50mv-ox, Bolt-rr Sprckt 10x49, Damper,rr Hub Shock.
With a quantity of six pieces, the Nut,10mm is the most used part in the REAR HUB/BRAKE/CHAIN diagram.