The Bolt Flang 6x12 is the lowest priced item on this Crankcase schematic.
Some items from this specific schematic: Bolt Flange 6x18, Bolt,flange,6x50, Bolt,flange,6x60, Bolt,ubs 8x98.
The Crankcase assembly is constructed from several parts from which the Crankcase Set is the most expensive.