# Tri-clamp power head: ISO 2852 cap with a Ø15.9 socket for a 10 mL syringe, 1.5, 2 and 3 in

> How do I mount a syringe as the power cylinder on a tri-clamp Stirling engine?

- Category: Stirling engines › Tri-clamp engine parts
- Kind: Hardware
- Basis: ISO 2852 cap face with a Ø15.9 socket (10 mL syringe barrel OD) and an M5 port (Ø4.2 tap hole)
- Page: https://xemstudio.com/objects/tri-clamp-syringe-head/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-syringe-head · Plain text: https://xemstudio.com/objects/tri-clamp-syringe-head/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

**Exact dimensions.** Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part.

## Notes

- An ISO 2852 end cap carrying a 10 mL syringe barrel as the power cylinder, on centre.
- Socket Ø15.9 × 14 deep (floor 8 mm above the face) in a Ø22.9 boss that stands 16 mm off the back of the 6 mm cap; a Ø11.9 port through the floor joins the barrel to the engine.
- Opposite side: an M5 port (Ø4.2 tap hole) in a Ø10 boss for a sensor, a vent or a second transfer line.
- The 10 mL barrel's 14.5 mm bore sweeps about 2 mL per 12 mm of plunger stroke.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| syringe socket | Ø15.9 | 10 mL syringe barrel | socket | head-power-* |
| head faces | ISO 2852 | ferrule face + Type B gasket | clamp | head-* |
| vent / instrument port | Ø4.2 | M5 tap drill | designed | head-power-* |

## Sizes

| size_in | flange_od_mm | socket_mm | socket_depth_mm | port_mm | m5_tap_mm | overall_h_mm |
|---|---|---|---|---|---|---|
| 1.5 | 50.5 | 15.9 | 14 | 11.9 | 4.2 | 22 |
| 2 | 64.0 | 15.9 | 14 | 11.9 | 4.2 | 22 |
| 3 | 91.0 | 15.9 | 14 | 11.9 | 4.2 | 22 |

## Where the files are

- Long Earth Society: [Tri-clamp Stirling engine builds](https://longearthsociety.com/engineering/) — web, video — LES site
- James R. Senft: [An Introduction to Low Temperature Differential Stirling Engines (displacer and gap design)](https://www.stirlingengine.com/) — book — Moriya Press (verify at link)
- Wikipedia: [Stirling engine](https://en.wikipedia.org/wiki/Stirling_engine) — web — CC BY-SA 4.0 (text)

## Free STEP/STL (3 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-syringe-head/index.json

- head-power-syringe-1.5in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/head-power-syringe-1.5in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/head-power-syringe-1.5in.stl) — 1.5 in ISO 2852 cap: socket for a 10 mL syringe barrel (Ø15.9) as the power cylinder, M5 instrument/vent port
- head-power-syringe-2in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/head-power-syringe-2in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/head-power-syringe-2in.stl) — 2 in ISO 2852 cap: socket for a 10 mL syringe barrel (Ø15.9) as the power cylinder, M5 instrument/vent port
- head-power-syringe-3in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/head-power-syringe-3in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-displacers-and-heads/head-power-syringe-3in.stl) — 3 in ISO 2852 cap: socket for a 10 mL syringe barrel (Ø15.9) as the power cylinder, M5 instrument/vent port

## How it fits

### Goes in or on
- [Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch](https://xemstudio.com/objects/tri-clamp-spool/): ISO 2852 face on the spool or tee ferrule

### Connects to
- [Plastic syringes 1–60 mL as pistons and cylinders](https://xemstudio.com/objects/plastic-syringes/): 10 mL barrel (Ø15.9) in the socket
- [Syringe pistons: ring-less pistons with a con-rod fork for 10, 20 and 30 mL syringe barrels](https://xemstudio.com/objects/syringe-pistons/): piston for the 14.5 mm barrel bore
- [Tri-clamp displacer head: ISO 2852 cap with Ø3 rod bore and 4 mm barb, 1.5, 2 and 3 in](https://xemstudio.com/objects/tri-clamp-displacer-head/): transfer tube from its barb

### Also needed
- [Tri-clamp clamp, two-bolt: every flange size ½ to 4 in](https://xemstudio.com/objects/tri-clamp-clamps/): clamp and gasket on the face

## Questions

**Can I use a syringe as the power cylinder on a tri-clamp engine?**

Yes: this head has a Ø15.9 × 14 socket for a 10 mL barrel on centre, with a Ø11.9 port into the engine.

**How much does a 10 mL syringe sweep?**

Its 14.5 mm bore sweeps about 2 mL per 12 mm of stroke.

**What is the M5 hole for?**

An extra port: a sensor, a vent or a second line, Ø4.2 for an M5 thread.

## Fits with

- [Plastic syringes 1–60 mL as pistons and cylinders](https://xemstudio.com/objects/plastic-syringes/)
- [Syringe pistons: ring-less pistons with a con-rod fork for 10, 20 and 30 mL syringe barrels](https://xemstudio.com/objects/syringe-pistons/)
- [Tri-clamp displacer head: ISO 2852 cap with Ø3 rod bore and 4 mm barb, 1.5, 2 and 3 in](https://xemstudio.com/objects/tri-clamp-displacer-head/)
- [Tri-clamp clamp, two-bolt: every flange size ½ to 4 in](https://xemstudio.com/objects/tri-clamp-clamps/)
- [Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch](https://xemstudio.com/objects/tri-clamp-spool/)