Tube piston rods Ø5 × Ø3.4 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tube-piston-rods-5mm/  (CC BY 4.0)
Basis: Ø5 OD tube with a Ø3.4 bore, so the Ø3 displacer rod passes inside without touching
Catalog version: 2026-10-20

Sizes: see table below
- Ø5 OD × Ø3.4 ID tubes, 80, 120 and 160 long, 0.3 chamfers on both ends.
- The OD seats in the piston plug's Ø5 socket and in the rhombic lower yoke or the flexure hub collars; the Ø3 displacer rod runs inside with 0.2 mm radial gap by design.
- Wall thickness 0.8.

file  OD  ID  length
tube-rod-5x3.4x80  5  3.4  80
tube-rod-5x3.4x120  5  3.4  120
tube-rod-5x3.4x160  5  3.4  160

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, 3 parts): https://xemstudio.com/files/hardware/tube-piston-rods-5mm/index.json
API: https://xemstudio.com/api/geometry?object=tube-piston-rods-5mm