# Tri-clamp gland caps, 2 in: end caps with a rod gland, an M5 port and a stop bridge or bell-crank post

> How do I take a displacer rod out of the top of a tri-clamp tee?

- Category: Hardware › Stirling & thermoacoustic
- Kind: Hardware
- Basis: ISO 2852 face, recess and 20° back cone as the flat end cap on this site; pedestal clear of the 2 in clamp; rod, bushing and port sizes are design values
- Page: https://xemstudio.com/objects/tri-clamp-rd-gland-caps/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-rd-gland-caps · Plain text: https://xemstudio.com/objects/tri-clamp-rd-gland-caps/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

- A 2 in end cap with the rod's gland on its back. It closes the top of the run of a standard 2 in equal tee with a Type B gasket and a 2 in clamp, like any end cap; a Ø50.8 pedestal lifts everything on its back clear of the clamp.
- Ringbom cap: the Ø8 rod runs in an 8 × 12 × 20 bushing at the top of a Ø36 boss; an 8 mm collar on the rod stops on the boss top and under a bridge 26 mm up, so the free displacer travels 18 mm.
- Gamma cap: the Ø3 displacer rod runs in two 3 × 5 × 6 bushings, one at each end of the gland; a post on a Ø64 platform carries the bell crank's pivot 89.5 mm above the face.
- Both caps have an M5 tapped port from the pedestal into the cap's recess: a plug, a gauge, or a one-way valve that lets air in when the gas falls below air pressure (it keeps the rolling diaphragm the right way round).

## 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 |
|---|---|---|---|---|
| clamp face | ISO 2852 2 in face, 1.6 recess (the flat end cap's) | Type B gasket on the top of a 2 in tee's run, 2 in clamp | clamp | all |
| pedestal | Ø50.8 to 10 above the face | clamp inner Ø52.8 (no contact) | designed | all |
| M5 port | Ø4.2 | M5 tap drill (plug, gauge or one-way valve) | designed | all |
| bushing seat | Ø12 × 20 | 8 × 12 × 20 sleeve bushing | press | rd-gland-cap-2in-ringbom* |
| rod way | Ø9 | Ø8 Ringbom rod (no contact) | designed | rd-gland-cap-2in-ringbom* |
| bridge hole | Ø10 | Ø8 Ringbom rod (no contact) | designed | rd-gland-cap-2in-ringbom* |
| bushing seats | Ø5 × 6 (two) | 3 × 5 × 6 sleeve bushings | press | rd-gland-cap-2in-gamma* |
| rod way | Ø4 | Ø3 displacer rod (no contact) | designed | rd-gland-cap-2in-gamma* |
| pivot hole | Ø3 | Ø3 × 16 dowel (bell-crank pivot) | press | rd-gland-cap-2in-gamma* |

## Sizes

| part | top_mm | rod | gland |
|---|---|---|---|
| ringbom | 30.0 | Ø8 | 8 × 12 × 20 |
| gamma | 22.0 | Ø3 | 2 × 3 × 5 × 6 |

## 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 (clamp fitting dimensions, tube OD and wall)](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-rd-gland-caps/index.json

- rd-gland-cap-2in-ringbom: [STEP](https://xemstudio.com/files/hardware/tri-clamp-rd-gland-caps/rd-gland-cap-2in-ringbom.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-rd-gland-caps/rd-gland-cap-2in-ringbom.stl) — 2 in Ringbom gland cap: flat end cap face (ISO 2852, recess 1.6), Ø50.8 pedestal to 10, Ø36 boss to 30 with an Ø12 × 20 bushing seat at the top, Ø9 rod way, two posts and a bridge 26 above the top (Ø10 hole), M5 port (Ø4.2) at x -21
- rd-gland-cap-2in-gamma: [STEP](https://xemstudio.com/files/hardware/tri-clamp-rd-gland-caps/rd-gland-cap-2in-gamma.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-rd-gland-caps/rd-gland-cap-2in-gamma.stl) — 2 in gamma gland cap: flat end cap face, Ø50.8 pedestal to 10, Ø64 × 4 platform, Ø16 boss to 22, Ø5 × 6 seats for two 3 × 5 × 6 bushings and an Ø4 rod way between, bell-crank post at x 30 with an Ø3 pivot hole 89.54 above the face, M5 port (Ø4.2) at x -21

## Questions

**What fitting does it go on?**

The top of the run of a standard 2 in equal tee, or any 2 in ferrule: it is an end cap with things on its back.

**What is the M5 port for?**

A plug, a pressure gauge, or a one-way valve that lets air in so the gas never drops below air pressure.

## Fits with

- [Tee inserts, 2 in: volume fillers for the run and branch of a standard 2 in equal tee](https://xemstudio.com/objects/tri-clamp-rd-tee-inserts/)
- [Sanitary clamp tees and short-outlet tees (7MP, 7MPS): ½ to 4 in](https://xemstudio.com/objects/sanitary-clamp-tees/)
- [Tri-clamp end cap, 6 mm flat: 1.5 and 2 in](https://xemstudio.com/objects/tri-clamp-end-cap/)
- [Tri-clamp gasket, ISO 2852 Type B: 1.5 and 2 in](https://xemstudio.com/objects/tri-clamp-gasket/)
- [Build list: Tri-clamp rolling-diaphragm Ringbom, 2 in](https://xemstudio.com/objects/list-tri-clamp-rd-ringbom/)
- [Build list: Tri-clamp rolling-diaphragm gamma, 2 in](https://xemstudio.com/objects/list-tri-clamp-rd-gamma/)