In this schematic the "Bolt" is used most often.
A sample from the products for the Steering Stem (model T/v/w/x) include: Bolt, Bearing(25x47x15), Nut,cap, Washer(22.5x32x1.6).
The Cap(od:12) is the lowest priced item on this Steering Stem (model T/v/w/x) schematic.