# Tri-clamp half gasket for a clamped leaf or rim: 2 in, web 0.6 or 0.45

> How do I seal a flat plate clamped in a tri-clamp joint?

- Category: Hardware › Stirling & thermoacoustic
- Kind: Hardware
- Basis: ISO 2852 Type B section split at the joint plane: bead into one face's 1.6 recess with the Type B's 0.3 squeeze, web so that two webs and the plate make the 1.7 joint
- Page: https://xemstudio.com/objects/tri-clamp-leaf-half-gasket/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-leaf-half-gasket · Plain text: https://xemstudio.com/objects/tri-clamp-leaf-half-gasket/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 of them sandwich a flat plate (a flexure leaf, the liner's rim) in a 2 in joint: each bead fills its ferrule's recess, each web lies on its land, the plate between the webs. Web 0.6 for a 0.5 plate, 0.45 for a 0.8 plate: 0.6 + 0.5 + 0.6 = 0.45 + 0.8 + 0.45 = 1.7, the Type B web, so the clamp closes as usual.
- Ratings, as facts: the gasket must be rated above the relief setting (15 bar gauge) at its temperature; helium permeates silicone faster than PTFE; PTFE cold-flows under sustained load and heat. Cut or ordered to this drawing.

## 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 |
|---|---|---|---|---|
| bead | Ø47.5–Ø56.5 × 1.9 | ferrule face recess 1.6 (0.3 squeeze) | clamp | all |
| web | 0.6 / 0.45 thick to Ø63 | ferrule land and the leaf or rim | clamp | all |

## Sizes

| web_mm | plate_mm | bead_mm | od_mm | id_mm |
|---|---|---|---|---|
| 0.6 | 0.5 | 1.9 | 63 | 47.5 |
| 0.45 | 0.8 | 1.9 | 63 | 47.5 |

## Where the files are

- ISO (via iTeh sample): [ISO 2852 clamp liners: face profile and flange / groove diameters](https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf) — PDF — standard excerpt; dimensions are facts
- ASME: [BPE Bioprocessing Equipment (tube OD and wall, clamp fittings)](https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment) — standard — ASME; dimensions are facts (verify at link)
- Long Earth Society: [Engine builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (2 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/index.json

- leaf-half-gasket-2in-w0.6: [STEP](https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/leaf-half-gasket-2in-w0.6.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/leaf-half-gasket-2in-w0.6.stl) — half gasket: web 0.60 thick from Ø47.5 to Ø63, bead Ø47.5–Ø56.5 × 1.9 into one face's recess (1.6 + 0.3 squeeze); two per leaf, beads outward
- leaf-half-gasket-2in-w0.45: [STEP](https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/leaf-half-gasket-2in-w0.45.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/leaf-half-gasket-2in-w0.45.stl) — half gasket: web 0.45 thick from Ø47.5 to Ø63, bead Ø47.5–Ø56.5 × 1.9 into one face's recess (1.6 + 0.3 squeeze); two per leaf, beads outward

## Questions

**Why not a Type B gasket each side?**

Two full gaskets plus the plate would be 1.7 + 1.7 + plate: too thick for the clamp to close.

## Fits with

- [Tri-clamp flexure leaf: spiral planar spring clamped in a 2 in joint like a gasket (displacer and piston)](https://xemstudio.com/objects/tri-clamp-flexure-leaf/)
- [Free-piston displacer liner: Ø40 bore, regenerator inner wall, rim clamped in the tri-clamp joint](https://xemstudio.com/objects/fpse-displacer-cylinder/)
- [High-pressure bolted sanitary clamp, 2 in (bought part: ratings, no drawing)](https://xemstudio.com/objects/sanitary-high-pressure-clamp/)
- [Build list: Free-piston Stirling generator, 2 in tri-clamp (pressurised, linear alternator)](https://xemstudio.com/objects/list-fpse-generator-2in/)