# Carbon fibre square tube (box section) sizes, 4 to 20 mm

> What sizes do carbon fibre square tubes come in?

- Category: RC planes › Carbon tubes and spars
- Kind: Standard part
- Basis: Maker's product listings (Easy Composites box section)
- Page: https://xemstudio.com/objects/carbon-fibre-square-tube-sizes/ · JSON: https://xemstudio.com/api/geometry?object=carbon-fibre-square-tube-sizes · Plain text: https://xemstudio.com/objects/carbon-fibre-square-tube-sizes/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- 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

- Square carbon tube (box section) as listed: outer size, inner size and wall in mm. Lengths 1000 mm (4 and 6 mm) or 1000 / 2000 mm.
- Tolerance stated for the 6 × 4 section: ±0.25 mm on outer and inner size.
- No file: the corner radii are not published, and a square section drawn with invented corners would not be the real fit.

## Sizes

| outer mm | inner mm | wall mm |
|---|---|---|
| 4 | 2.5 | 0.75 |
| 6 | 4 | 1 |
| 8 | 7 | 0.5 |
| 10 | 8 | 1 |
| 20 | 17 | 1.5 |

## Where the files are

- Easy Composites: [Carbon fibre box section (category: outer and inner size in each title)](https://www.easycomposites.co.uk/carbon-fibre-box-section) — web — Publisher's page; dimensions are facts
- Easy Composites: [6mm (4mm) carbon fibre box section (OD / ID tolerance 0.25 mm)](https://www.easycomposites.co.uk/6mm-4mm-carbon-fibre-box-section) — web — Publisher's page; dimensions are facts
- Easy Composites: [Technical datasheet: carbon fibre pultrusions (tube, rod, strip, box section sizes)](https://media.easycomposites.eu/datasheets/EC-TDS-Carbon-Fibre-Pultrusions.pdf) — web — Publisher's page; dimensions are facts

## Questions

**How thick is the wall of a 10 mm square carbon tube?**

1 mm (10 outer, 8 inner) for the listed 10 × 8 box section.

## Fits with

- [Carbon fibre tube sizes: pultruded and roll-wrapped, 0.7 to 60 mm OD](https://xemstudio.com/objects/carbon-fibre-tube-sizes/)
- [Carbon fibre rod sizes: round 0.28 to 12 mm, square 4 to 10 mm](https://xemstudio.com/objects/carbon-fibre-rod-sizes/)
- [Carbon fibre strip sizes: 3 × 0.5 to 12 × 2 mm](https://xemstudio.com/objects/carbon-fibre-strip-sizes/)