The Screw,taping,4x20 is the lowest priced item on this E-6 schematic.
A sample from the products for the E-6 include: Bolt,flange,sh,6x25, Fan Comp,cooling, Bolt,flange,sh,6x16, Screw,taping,4x20.
This schematic depicts all components used in the Nps50 Zoomer.dx 2009 (9) Japan Af58-180 E-6 partslist.