# 2 in end cap with a bored boss for two 8 × 12 × 20 sleeve bushings (piston-rod gland)

> How do I take a piston rod out of a charged tri-clamp cylinder?

- Category: Hardware › Stirling & thermoacoustic
- Kind: Hardware
- Basis: ISO 2852 2 in face; bushing size from its standard; boss length is a design value
- Page: https://xemstudio.com/objects/tri-clamp-rod-gland-cap/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-rod-gland-cap · Plain text: https://xemstudio.com/objects/tri-clamp-rod-gland-cap/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 a bored boss: two 8 × 12 × 20 sleeve bushings 36 mm apart guide the Ø8 piston rod and are its gland. The rod's side load from the con-rod is taken here, so the piston in the bore carries none.

## 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 |
|---|---|---|---|---|
| face | ISO 2852 2 in | Type B gasket, 2 in clamp | clamp | all |
| gland seat | Ø12, z 6–62 | two 8 × 12 × 20 sleeve bushings | press | gland-cap-2in-2x-8x12x20* |
| gland seat | Ø10, z 6–62 | two 6 × 10 × 10 sleeve bushings | press | gland-cap-2in-2x-6x10x10* |
| port bosses | 3 × 1/4-18 NPT on r 17, tap drill Ø11.1 × 12 | fill valve, gauge, relief valve | designed | gland-cap-2in-2x-6x10x10* |

## Sizes

| feature | value |
|---|---|
| face | ISO 2852 2 in |
| boss | Ø24, to 62 from the face |
| seat | Ø12, z 6–62 |

## 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-rod-gland-cap/index.json

- gland-cap-2in-2x-8x12x20: [STEP](https://xemstudio.com/files/hardware/tri-clamp-rod-gland-cap/gland-cap-2in-2x-8x12x20.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-rod-gland-cap/gland-cap-2in-2x-8x12x20.stl) — 2 in rod-gland cap: ISO 2852 face, body Ø50.8 to 12, boss Ø24 to 62, Ø12 seat z 6–62 for two 8 × 12 × 20 bushings (6–26, 42–62), Ø9 below
- gland-cap-2in-2x-6x10x10-3x-npt14: [STEP](https://xemstudio.com/files/hardware/tri-clamp-rod-gland-cap/gland-cap-2in-2x-6x10x10-3x-npt14.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-rod-gland-cap/gland-cap-2in-2x-6x10x10-3x-npt14.stl) — 2 in rod-gland cap for a Ø6 rod: ISO 2852 face, body Ø50.8 to 12, boss Ø22 to 62, Ø10 seat z 6–62 for two 6 × 10 × 10 bushings (6–16, 52–62), three 1/4 NPT bosses on its back on r 17

## Questions

**Does it leak?**

A close-running gland always leaks a little: at 5 bar gauge about 10.1 mL/min at 5 µm radial clearance, 81 mL/min at 10 µm (at the gland's pressure).

## Fits with

- [2 in × 6 in spool with three 1/4 NPT bosses at mid-length](https://xemstudio.com/objects/tri-clamp-spool-npt-bosses/)
- [Ground rods, hollow piston rod and crank shafts for the performance engines (Ø6, Ø8, Ø10 / 7)](https://xemstudio.com/objects/stirling-precision-rods/)
- [Build list: Tri-clamp horizontal gamma generator, 2 in, chargeable](https://xemstudio.com/objects/list-tri-clamp-horizontal-gamma/)