Plunger clevis for a glass syringe: cap over the piston collar with a con-rod fork — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/glass-syringe-plunger-clevis/  (CC BY 4.0)
Basis: My geometry, drawn to the glass syringe's published piston collar (KD Scientific / Tomopal: 5 mL Ø17.25, 10 mL Ø19.95); fork sized for the 5 mm thick pin-end con-rods
Catalog version: 2026-10-20

Sizes: see table below
- The cap's pocket is the piston collar's published diameter, exactly (5 mL Ø17.25, 10 mL Ø19.95), 3 deep (the collar thickness drawn on the plunger file; the datasheet gives no thickness). One M3 grub (set-m3x3) in a Ø2.5 tapped hole reaches the collar's edge; the cap's top face pushes on the collar.
- Fork: 12 × 12 block, 5 mm slot for a 5 mm con-rod, Ø3 pin hole 12 above the collar underside, for a dowel-3x12 (flush both sides).
- Used on the mug LTD and the test-tube marble engine (5 mL).

part  pocket_mm  body_mm  pin_above_collar_mm  pin
plunger-clevis-glass-5ml  17.25  23.25  12.0  Ø3 (dowel-3x12)
plunger-clevis-glass-10ml  19.95  25.95  12.0  Ø3 (dowel-3x12)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- KD Scientific: Full Line of Glass Syringes, rev. A (order codes 78-0871 to 78-0880): piston OD, barrel OD D1, barrel collar D2, piston collar D3, length L — PDF — manufacturer datasheet [verify license at link] — https://www.kdscientific.com/media/brochures/KDS%20Glass%20Syringe%20Datasheet.pdf
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/glass-syringe-plunger-clevis/index.json
API: https://xemstudio.com/api/geometry?object=glass-syringe-plunger-clevis