# Silicone tube 1 × 3 to 10 × 14 mm (ID × OD)

> What size silicone tube for a Stirling engine transfer port?

- Category: Hardware › Pipe & fittings
- Kind: Hardware
- Basis: Common silicone tube sizes (ID × OD, 1–2 mm wall); each size as a 50 mm length, and 4 × 6 also at the lengths the syringe engines' transfer lines are cut to
- Page: https://xemstudio.com/objects/silicone-tube/ · JSON: https://xemstudio.com/api/geometry?object=silicone-tube · Plain text: https://xemstudio.com/objects/silicone-tube/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Silicone tube sizes, ID × OD: 1×3, 2×4, 3×5, 4×6, 5×8, 6×9, 8×12, 10×14 mm; walls 1.0 to 2.0 mm. Each size is a 50 mm length at exact ID and OD; 4 × 6 also comes cut to 20, 30 and 151 mm.
- The tube stretches over a barb larger than its ID.
- For a transfer port on a can or test-tube Stirling I use 4 mm ID tube kept as short as possible, since every mL inside the tube is dead volume.
- The barbs on the hose-barb page are drawn with the shank at the tube ID and ridges at ID + 1.2 for each size.
- Cut lengths on the engines here: can engine 20 + 20 + 20 (cap barb up, across, up into the Luer tip, through two transfer elbows); Ross yoke alpha 20 + 30 + 20 through two elbows; alpha V-twin 20 + 151 + 151 + 20 through three elbows.

## Sizes

| id_mm | od_mm | wall_mm | barb |
|---|---|---|---|
| 1 | 3 | 1.0 | — |
| 2 | 4 | 1.0 | barb-2mm |
| 3 | 5 | 1.0 | barb-3mm |
| 4 | 6 | 1.0 | barb-4mm |
| 5 | 8 | 1.5 | — |
| 6 | 9 | 1.5 | barb-6mm |
| 8 | 12 | 2.0 | barb-8mm |
| 10 | 14 | 2.0 | — |

## Where the files are

- Wikipedia: [Hose barb](https://en.wikipedia.org/wiki/Hose_barb) — web — CC BY-SA 4.0 (text)
- Wikipedia: [Push-fit fitting](https://en.wikipedia.org/wiki/Push-to-connect_fitting) — web — CC BY-SA 4.0 (text)
- McMaster-Carr: [Tubing (free STEP per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/tubing/) — STEP, PDF — McMaster-Carr site terms (verify at link)
- Long Earth Society: [Engine and rig builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (11 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/silicone-tube/index.json

- silicone-tube-1x3-50: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-1x3-50.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-1x3-50.stl) — silicone tube 1 ID × 3 OD, 50 mm
- silicone-tube-2x4-50: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-2x4-50.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-2x4-50.stl) — silicone tube 2 ID × 4 OD, 50 mm
- silicone-tube-3x5-50: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-3x5-50.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-3x5-50.stl) — silicone tube 3 ID × 5 OD, 50 mm
- silicone-tube-4x6-50: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-50.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-50.stl) — silicone tube 4 ID × 6 OD, 50 mm
- silicone-tube-5x8-50: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-5x8-50.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-5x8-50.stl) — silicone tube 5 ID × 8 OD, 50 mm
- silicone-tube-6x9-50: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-6x9-50.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-6x9-50.stl) — silicone tube 6 ID × 9 OD, 50 mm
- silicone-tube-8x12-50: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-8x12-50.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-8x12-50.stl) — silicone tube 8 ID × 12 OD, 50 mm
- silicone-tube-10x14-50: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-10x14-50.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-10x14-50.stl) — silicone tube 10 ID × 14 OD, 50 mm
- silicone-tube-4x6-20: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-20.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-20.stl) — silicone tube 4 ID × 6 OD, cut to 20 mm
- silicone-tube-4x6-30: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-30.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-30.stl) — silicone tube 4 ID × 6 OD, cut to 30 mm
- silicone-tube-4x6-151: [STEP](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-151.step) · [STL](https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-151.stl) — silicone tube 4 ID × 6 OD, cut to 151 mm

## How it fits

### Goes in or on
- [Hose barbs for 2, 3, 4, 6 and 8 mm ID tube](https://xemstudio.com/objects/hose-barbs/): tube ID stretched over the barb ridges (ID + 1.2)
- [Can-engine cap for 53.3, 58, 66 and 76.2 mm cans](https://xemstudio.com/objects/can-engine-cap/): 4 mm ID tube on the cap's integral Ø4 barb

### Alternatives
- [PU pneumatic tube 4 to 12 mm OD (push-fit sizes)](https://xemstudio.com/objects/pu-pneumatic-tube/): stiff tube for push-fit fittings

### Also needed
- [Zip tie (cable tie) 4.8 × 1.3 mm cross-section](https://xemstudio.com/objects/zip-ties/): a tie over the barb as a clamp

## Questions

**What silicone tube for a Stirling transfer port?**

4 mm ID × 6 mm OD, kept short (under about 30 mm), on a 4 mm barb.

**What wall thickness is silicone tube?**

1.0 mm up to 4 × 6, 1.5 mm for 5 × 8 and 6 × 9, 2.0 mm for 8 × 12 and 10 × 14.

## Fits with

- [Hose barbs for 2, 3, 4, 6 and 8 mm ID tube](https://xemstudio.com/objects/hose-barbs/)
- [PU pneumatic tube 4 to 12 mm OD (push-fit sizes)](https://xemstudio.com/objects/pu-pneumatic-tube/)
- [Can-engine cap for 53.3, 58, 66 and 76.2 mm cans](https://xemstudio.com/objects/can-engine-cap/)
- [Zip tie (cable tie) 4.8 × 1.3 mm cross-section](https://xemstudio.com/objects/zip-ties/)
- [Plastic syringes 1–60 mL as pistons and cylinders](https://xemstudio.com/objects/plastic-syringes/)