LTD crank stand for a 623 bearing, axis 112 above the foot — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/ltd-crank-stand/  (CC BY 4.0)
Basis: 623 bearing (3 × 10 × 4) pocket at the bearing OD; M3 clearance Ø3.4 (ISO 273)
Catalog version: 2026-10-20

Sizes: see table below
- The bearing stand that holds the LTD engine's Ø3 crankshaft above the top plate: a 40 × 6 upright, 119 tall, with a 28 × 14 arch under it that straddles the plate's bosses, on two 20 × 10 × 3 feet (one 68 mm foot with the arch cut out).
- A Ø10 pocket through the 6 mm upright, 112 mm above the foot's underside, holds a 623 bearing (fit: press). That height is what the con-rod needs to reach a piston inside the 90 mm syringe barrel standing in the top plate.
- Two Ø3.4 holes 54 mm apart in the feet take M3 × 8 screws into the top plate's tapped pads. Two stands carry one crankshaft, with the flywheel between them.

part  height  shaft axis  pocket  feet  holes
ltd-crank-stand-a112  119  112  Ø10 × 6  68 × 10 × 3 less the 28 arch  2 × Ø3.4 at 54

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Stirling engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stirling_engine
- James R. Senft: An Introduction to Low Temperature Differential Stirling Engines — book — Moriya Press [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, 1 parts): https://xemstudio.com/files/hardware/ltd-crank-stand/index.json
API: https://xemstudio.com/api/geometry?object=ltd-crank-stand