The most reasonably priced component used on the Ke125-a10 Ke125 1983 Usa Usa Canada Rear Hub/brake/chain ('80-'81 A7 is the Nut,8m/m.
Some items from this specific schematic: Collar,rr Brake,l=22, Nut,castle,14mm, Panel Assy,rr Brake, Drum-assy,rr.
With six applications this Nut,8m/m is the most specified part.