Rod clevises for a Ø2 or Ø3 rod or a Ø5 tube, 5 mm gap — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/rod-clevises/  (CC BY 4.0)
Basis: Clevis with a socket at the rod Ø, M3 grub, 5 mm gap for a 5 mm con-rod and a Ø3 cross pin 8 mm above the slot floor (a con-rod eye, R7, clears the floor by 1 mm)
Catalog version: 2026-10-20

Sizes: see table below
- A fork 12 × 9 × 18 with a 5 mm gap (the con-rod thickness) between two 3.5 mm cheeks and a Ø3 cross hole 12 mm up; the slot floor is 4 mm up, 8 below the pin, so the con-rod's R7 eye swings 1 mm clear of it. A round socket below; overall 30 tall.
- Rod-clevis-2mm: Ø8 socket boss with a Ø2 bore for the can and LTD engines' displacer rod. rod-clevis-3mm: Ø9 socket boss with a Ø3 bore 16 deep for the displacer rod. rod-clevis-5mm-tube: Ø11 boss with a Ø5 bore for the tube piston rod. Socket wall 3 mm, so an M3 × 3 grub sits flush.
- A radial Ø2.5 hole (M3 tap drill) 6 mm below the fork locks the rod with a grub.
- The con-rod's 623 end sits in the gap on a Ø3 × 12 pin, the full width of the fork.

file  socket  boss  gap  pin hole  overall
rod-clevis-2mm  Ø2 × 16  Ø7  5  Ø3  11 × 9 × 26
rod-clevis-3mm  Ø3 × 16  Ø9  5  Ø3 at 12, floor at 4  12 × 9 × 30
rod-clevis-5mm-tube  Ø5 × 16  Ø11  5  Ø3 at 12, floor at 4  12 × 11 × 30

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Long Earth Society: Tri-clamp Stirling 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/rod-clevises/index.json
API: https://xemstudio.com/api/geometry?object=rod-clevises