{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "carbon-fibre-square-tube-sizes",
 "name": "Carbon fibre square tube (box section) sizes, 4 to 20 mm",
 "kind": "standard",
 "category": "RC planes",
 "group": "Carbon tubes and spars",
 "year": null,
 "question": "What sizes do carbon fibre square tubes come in?",
 "tags": [
  "carbon fiber square tube",
  "box section",
  "carbon tube",
  "rc plane",
  "drone",
  "stock sizes"
 ],
 "aliases": [
  "carbon fiber square tube sizes",
  "carbon box section sizes",
  "10mm square carbon tube",
  "square carbon spar"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/carbon-fibre-square-tube-sizes/",
 "sheet_txt": "https://xemstudio.com/objects/carbon-fibre-square-tube-sizes/sheet.txt",
 "sheet": {
  "basis": "Maker's product listings (Easy Composites box section)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "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."
  ],
  "table": {
   "columns": [
    "outer mm",
    "inner mm",
    "wall mm"
   ],
   "rows": [
    [
     "4",
     "2.5",
     "0.75"
    ],
    [
     "6",
     "4",
     "1"
    ],
    [
     "8",
     "7",
     "0.5"
    ],
    [
     "10",
     "8",
     "1"
    ],
    [
     "20",
     "17",
     "1.5"
    ]
   ]
  }
 },
 "sheet_text": "Carbon fibre square tube (box section) sizes, 4 to 20 mm — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/carbon-fibre-square-tube-sizes/  (sheet CC BY 4.0)\nBasis: Maker's product listings (Easy Composites box section)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- Tolerance stated for the 6 × 4 section: ±0.25 mm on outer and inner size.\n- No file: the corner radii are not published, and a square section drawn with invented corners would not be the real fit.\n\nouter mm  inner mm  wall mm\n4  2.5  0.75\n6  4  1\n8  7  0.5\n10  8  1\n20  17  1.5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Easy Composites: Carbon fibre box section (category: outer and inner size in each title) — web — Publisher's page; dimensions are facts — https://www.easycomposites.co.uk/carbon-fibre-box-section\n- Easy Composites: 6mm (4mm) carbon fibre box section (OD / ID tolerance 0.25 mm) — web — Publisher's page; dimensions are facts — https://www.easycomposites.co.uk/6mm-4mm-carbon-fibre-box-section\n- Easy Composites: Technical datasheet: carbon fibre pultrusions (tube, rod, strip, box section sizes) — web — Publisher's page; dimensions are facts — https://media.easycomposites.eu/datasheets/EC-TDS-Carbon-Fibre-Pultrusions.pdf\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=carbon-fibre-square-tube-sizes\n",
 "sources": [
  {
   "publisher": "Easy Composites",
   "title": "Carbon fibre box section (category: outer and inner size in each title)",
   "url": "https://www.easycomposites.co.uk/carbon-fibre-box-section",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Easy Composites",
   "title": "6mm (4mm) carbon fibre box section (OD / ID tolerance 0.25 mm)",
   "url": "https://www.easycomposites.co.uk/6mm-4mm-carbon-fibre-box-section",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Easy Composites",
   "title": "Technical datasheet: carbon fibre pultrusions (tube, rod, strip, box section sizes)",
   "url": "https://media.easycomposites.eu/datasheets/EC-TDS-Carbon-Fibre-Pultrusions.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "carbon-fibre-tube-sizes",
  "carbon-fibre-rod-sizes",
  "carbon-fibre-strip-sizes"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "How thick is the wall of a 10 mm square carbon tube?",
   "a": "1 mm (10 outer, 8 inner) for the listed 10 × 8 box section."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/carbon-fibre-square-tube-sizes/index.md"
}