# Tri-clamp carbonation stone caps: 1½ in, 4 to 16 in down tube

> How do I mount a carbonation stone on a tri-clamp?

- Category: Hardware › Sanitary clamp fittings
- Kind: Hardware
- Basis: Xem Studio design: the standard 1½ in solid cap, a ¼ in hose barb outside, a Ø6.35 down tube and a socket for a ½ in (Ø12.7) diffusion stone
- Page: https://xemstudio.com/objects/tri-clamp-carb-stone-caps/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-carb-stone-caps · Plain text: https://xemstudio.com/objects/tri-clamp-carb-stone-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.** True size, with no printing tolerance added.

## Notes

- Gas in through the barb, out through the stone at the bottom: carbonating or oxygenating wort in the vessel.
- Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40.

## Sizes

| tube_in | tube_mm | stone |
|---|---|---|
| 4 | 101.6 | ½ in × 2 in stone |
| 6 | 152.4 | ½ in × 2 in stone |
| 12 | 304.8 | ½ in × 2 in stone |
| 16 | 406.4 | ½ in × 2 in stone |

## Where the files are

- GW Kent: [Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness](https://www.gwkent.com/triclamp-guide) — web — publisher's guide; dimensions cited
- Rubber Fab: [Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50)](https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf) — PDF — maker chart; dimensions are facts (verify at link)

## Free STEP/STL (4 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-carb-stone-caps/index.json

- carb-stone-cap-1.5in-4in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-carb-stone-caps/carb-stone-cap-1.5in-4in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-carb-stone-caps/carb-stone-cap-1.5in-4in.stl) — 1½ in cap: ¼ in barb outside, Ø6.35 tube 4 in down to a Ø12.7 × 15 socket for a ½ in diffusion stone
- carb-stone-cap-1.5in-6in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-carb-stone-caps/carb-stone-cap-1.5in-6in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-carb-stone-caps/carb-stone-cap-1.5in-6in.stl) — 1½ in cap: ¼ in barb outside, Ø6.35 tube 6 in down to a Ø12.7 × 15 socket for a ½ in diffusion stone
- carb-stone-cap-1.5in-12in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-carb-stone-caps/carb-stone-cap-1.5in-12in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-carb-stone-caps/carb-stone-cap-1.5in-12in.stl) — 1½ in cap: ¼ in barb outside, Ø6.35 tube 12 in down to a Ø12.7 × 15 socket for a ½ in diffusion stone
- carb-stone-cap-1.5in-16in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-carb-stone-caps/carb-stone-cap-1.5in-16in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-carb-stone-caps/carb-stone-cap-1.5in-16in.stl) — 1½ in cap: ¼ in barb outside, Ø6.35 tube 16 in down to a Ø12.7 × 15 socket for a ½ in diffusion stone

## Questions

**Which length?**

Long enough to put the stone near the bottom: 16 in for a 6 × 18 in vessel.

## Fits with

- [Tri-clamp dip-tube caps: 1½ and 2 in, ⅜ in tube 6 to 24 in long](https://xemstudio.com/objects/tri-clamp-dip-tube-caps/)
- [Tri-clamp vessels with a dished or round welded bottom: 4, 6 and 8 in, 12 to 24 in deep](https://xemstudio.com/objects/tri-clamp-dished-bottom-vessels/)