# Clamp-on flow water jacket for 2 in tube (two halves, hose spigots)

> How do I water-cool a plain tri-clamp tube?

- Category: Hardware › Stirling & thermoacoustic
- Kind: Hardware
- Basis: Design values; M4 clearance holes ISO 273 medium
- Page: https://xemstudio.com/objects/tri-clamp-flow-water-jacket/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-flow-water-jacket · Plain text: https://xemstudio.com/objects/tri-clamp-flow-water-jacket/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**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

- Two halves bolted round the tube with four M4 screws; each half is its own water space with two Ø8 hose spigots (in and out), so the two run in series with a short hose between them. The inner wall is pressed on the tube by the bolts.
- On the performance engines it sits over the cooler zone, 9.5 mm behind the clamp face (a 2 in clamp reaches 7.13 mm).
- Optional: without it the cold end runs hot and the power falls; a wet rag on the cold end is the minimum.

## 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 |
|---|---|---|---|---|
| bore | Ø50.8 × 48 | 2 in tube OD | clamp | all |
| split | 1.0 total (0.5 per half) | the other half | clamp | all |
| ear holes | Ø4.5 | M4 clearance (ISO 273 medium) | designed | all |
| hose spigots | Ø8 × 10, Ø5 bore | 8 mm ID hose | press | all |
| start behind the clamp face | 9.5 | a 2 in clamp reaches 7.13 behind the face | designed | all |

## Sizes

| feature | value |
|---|---|
| bore | Ø50.8 × 48 |
| water space | r 27.4–31.4 |
| spigots | 2 per half, Ø8 × 10 |
| bolts | 4 × M4 |

## Where the files are

- Long Earth Society: [Engine builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-flow-water-jacket/index.json

- water-jacket-half-2in-48-flow: [STEP](https://xemstudio.com/files/hardware/tri-clamp-flow-water-jacket/water-jacket-half-2in-48-flow.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-flow-water-jacket/water-jacket-half-2in-48-flow.stl) — clamp-on flow water-jacket half for 2 in tube: bore Ø50.8 × 48, inner wall 2, water space 4, outer wall 2, end walls 2; ears with 2 × Ø4.5; two Ø8 × 10 hose spigots (Ø5 bore) on the crown

## Questions

**Which way does the water go?**

In at the spigot farther from the clamp face, out at the nearer one; put the outlets up so the jacket purges its air.

## Fits with

- [2 in × 152.4 mm closed-end hot spool, bore finished Ø48.00](https://xemstudio.com/objects/tri-clamp-closed-hot-spool-bored/)
- [Build list: Tri-clamp horizontal gamma generator, 2 in, chargeable](https://xemstudio.com/objects/list-tri-clamp-horizontal-gamma/)
- [Build list: Tri-clamp charged beta, 2 in](https://xemstudio.com/objects/list-tri-clamp-charged-beta/)