# Tri-clamp heat shield washer: 0.6 mm, ½ to 4 in tube

> What goes between the flame and a tri-clamp clamp?

- Category: Stirling engines › Tri-clamp engine parts
- Kind: Hardware
- Basis: Washer: bore = flange OD (C3), OD = clamp OD + 16, 0.6 mm thick
- Page: https://xemstudio.com/objects/tri-clamp-heat-shield/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-heat-shield · Plain text: https://xemstudio.com/objects/tri-clamp-heat-shield/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

- A flat washer that slides over a ferrule rim (bore = flange OD) and rests on the hot-end clamp, so the flame's plume is turned away from the tube and the parts above the hot joint.
- Bore = flange OD (25.0 / 50.5 / 64.0 / 77.5 / 91.0 / 119.0); OD = clamp OD + 16 (Ø50 / 75.5 / 89 / 102.5 / 116 / 144), 0.6 mm thick.
- It goes on from the open end of the spool before the cold-end head and its clamp; it drops down the tube onto the hot clamp.

## 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 |
|---|---|---|---|---|
| heat-shield bore | flange OD (C3) | ferrule rim it passes over; rests on the clamp | slide | heat-shield-* |

## Sizes

| size_in | bore_mm | od_mm | thickness_mm |
|---|---|---|---|
| ¾ | 25.0 | 50.0 | 0.6 |
| 1½ | 50.5 | 75.5 | 0.6 |
| 2 | 64.0 | 89.0 | 0.6 |
| 2½ | 77.5 | 102.5 | 0.6 |
| 3 | 91.0 | 116.0 | 0.6 |
| 4 | 119.0 | 144.0 | 0.6 |

## Where the files are

- ISO: [ISO 2852:1993 Stainless steel clamp pipe couplings for the food industry](https://www.iso.org/standard/7873.html) — standard — ISO (verify at link)
- Long Earth Society: [Tri-clamp Stirling engine builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (6 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-heat-shield/index.json

- heat-shield-0.75in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-0.75in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-0.75in.stl) — 0.75 in heat shield washer Ø50 OD (clamp OD + 16) × Ø25 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint
- heat-shield-1.5in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-1.5in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-1.5in.stl) — 1.5 in heat shield washer Ø75.5 OD (clamp OD + 16) × Ø50.5 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint
- heat-shield-2in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-2in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-2in.stl) — 2 in heat shield washer Ø89 OD (clamp OD + 16) × Ø64 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint
- heat-shield-2.5in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-2.5in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-2.5in.stl) — 2.5 in heat shield washer Ø102.5 OD (clamp OD + 16) × Ø77.5 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint
- heat-shield-3in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-3in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-3in.stl) — 3 in heat shield washer Ø116 OD (clamp OD + 16) × Ø91 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint
- heat-shield-4in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-4in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-4in.stl) — 4 in heat shield washer Ø144 OD (clamp OD + 16) × Ø119 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint

## 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/): bore = flange OD, slides over the rim and down the tube

### Connects to
- [Tri-clamp clamp, two-bolt: every flange size ½ to 4 in](https://xemstudio.com/objects/tri-clamp-clamps/): rests on the hot-end clamp (OD = clamp OD + 16)

### Also needed
- [Tri-clamp flat gasket (hot joint, bore ID): 1.7 mm ring, ½ to 4 in](https://xemstudio.com/objects/tri-clamp-hot-gasket/): flat gasket at the same hot joint

## Questions

**What size heat shield for a 2 inch tri-clamp?**

Ø89 × Ø64 bore × 0.6 mm: it passes over the 2 in ferrule rim and sits on the 73 mm clamp with 8 mm to spare all round.

**How does the heat shield go on a finished spool?**

Its bore is the flange OD, so it slides over the rim from the open end of the spool and down the tube onto the hot-end clamp.

## Fits with

- [Tri-clamp clamp, two-bolt: every flange size ½ to 4 in](https://xemstudio.com/objects/tri-clamp-clamps/)
- [Tri-clamp flat gasket (hot joint, bore ID): 1.7 mm ring, ½ to 4 in](https://xemstudio.com/objects/tri-clamp-hot-gasket/)
- [Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch](https://xemstudio.com/objects/tri-clamp-spool/)