Of all the components that make up this Fuel Tank the Screw-washer,5x30 has the lowest price.
Some items from this specific schematic: Bolt,flange,6x28, Tube B,fuel, O-ring, Washer, 8.3m/m.
This schematic depicts all components used in the Cbr600f Hurricane 1987 (h) Australia / Kph Fuel Tank partslist.