HTD displacer rods: Ø6 × 356.7 and M6 × 83 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/htd-displacer-rods/  (CC BY 4.0)
Basis: Exact geometry from the engine layouts
Catalog version: 2026-10-20

Sizes: see table below
- Main: Ø6 × 356.7, from the displacer hub's socket through the cap's guide, the bored spool and the piston's centre bore to the clevis below the crank. The guide and the piston bore are running fits (see Mating features); the piston bore is also the bleed that lets the crankcase follow the working space's mean pressure.

part  diameter_mm  length_mm
displacer-rod-6x356.7  6.0  356.7

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/htd-displacer-rods/index.json
API: https://xemstudio.com/api/geometry?object=htd-displacer-rods