Flanged power cylinder liner Ø16, 20, 25, 30 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/power-cylinder-liner/  (CC BY 4.0)
Basis: Bore 16–30, 3 mm wall, flange Ø(D + 24) × 4 with 4 × M3 clearance (Ø3.4, ISO 273) on Ø(D + 16)
Catalog version: 2026-10-20

Sizes: see table below
- The power cylinder of the gamma engines when not using a syringe: a tube D bore × D + 6 outside, with a 4 thick flange of Ø(D + 24) at its base.
- Four Ø3.4 holes at 45°, 135°, 225° and 315° on a Ø(D + 16) circle take M3 screws to the base or head.
- The power piston of the same bore runs in it (fit: run); its swept volume at 12 mm stroke is in the table.

file  bore  outside  length  flange  hole circle  mL per 12 mm stroke
liner-16x40-flanged  16  22  40  40  32  2.41
liner-20x45-flanged  20  26  45  44  36  3.77
liner-25x50-flanged  25  31  50  49  41  5.89
liner-30x55-flanged  30  36  55  54  46  8.48

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Crosshead — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Crosshead
- Wikipedia: Piston — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Piston
- James R. Senft: Miniature Stirling engine piston fits (LTD book) — book — reference [verify license at link] — https://www.stirlingengine.com/
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 4 parts): https://xemstudio.com/files/hardware/power-cylinder-liner/index.json
API: https://xemstudio.com/api/geometry?object=power-cylinder-liner