{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "silicone-tube",
 "name": "Silicone tube 1 × 3 to 10 × 14 mm (ID × OD)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Pipe & fittings",
 "year": null,
 "question": "What size silicone tube for a Stirling engine transfer port?",
 "tags": [
  "silicone",
  "tube",
  "hose",
  "transfer port",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "silicone tube sizes",
  "silicone tubing id od",
  "4x6 silicone tube",
  "transfer port tube stirling",
  "silicone hose dimensions"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 11,
 "url": "https://xemstudio.com/objects/silicone-tube/",
 "sheet_txt": "https://xemstudio.com/objects/silicone-tube/sheet.txt",
 "sheet": {
  "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",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "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."
  ],
  "table": {
   "columns": [
    "id_mm",
    "od_mm",
    "wall_mm",
    "barb"
   ],
   "rows": [
    [
     1,
     3,
     1,
     "—"
    ],
    [
     2,
     4,
     1,
     "barb-2mm"
    ],
    [
     3,
     5,
     1,
     "barb-3mm"
    ],
    [
     4,
     6,
     1,
     "barb-4mm"
    ],
    [
     5,
     8,
     1.5,
     "—"
    ],
    [
     6,
     9,
     1.5,
     "barb-6mm"
    ],
    [
     8,
     12,
     2,
     "barb-8mm"
    ],
    [
     10,
     14,
     2,
     "—"
    ]
   ]
  }
 },
 "sheet_text": "Silicone tube 1 × 3 to 10 × 14 mm (ID × OD) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/silicone-tube/  (CC BY 4.0)\nBasis: 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\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- The tube stretches over a barb larger than its ID.\n- 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.\n- 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.\n- 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.\n\nid_mm  od_mm  wall_mm  barb\n1  3  1.0  —\n2  4  1.0  barb-2mm\n3  5  1.0  barb-3mm\n4  6  1.0  barb-4mm\n5  8  1.5  —\n6  9  1.5  barb-6mm\n8  12  2.0  barb-8mm\n10  14  2.0  —\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Hose barb — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Hose_barb\n- Wikipedia: Push-fit fitting — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Push-to-connect_fitting\n- McMaster-Carr: Tubing (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/tubing/\n- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 11 parts): https://xemstudio.com/files/hardware/silicone-tube/index.json\nAPI: https://xemstudio.com/api/geometry?object=silicone-tube\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Hose barb",
   "url": "https://en.wikipedia.org/wiki/Hose_barb",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Push-fit fitting",
   "url": "https://en.wikipedia.org/wiki/Push-to-connect_fitting",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Tubing (free STEP per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/tubing/",
   "formats": [
    "STEP",
    "PDF"
   ],
   "license": "McMaster-Carr site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine and rig builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "hose-barbs",
  "pu-pneumatic-tube",
  "can-engine-cap",
  "zip-ties",
  "plastic-syringes"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "hose-barbs",
     "why": "tube ID stretched over the barb ridges (ID + 1.2)"
    },
    {
     "slug": "can-engine-cap",
     "why": "4 mm ID tube on the cap's integral Ø4 barb"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "pu-pneumatic-tube",
     "why": "stiff tube for push-fit fittings"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "zip-ties",
     "why": "a tie over the barb as a clamp"
    }
   ]
  }
 ],
 "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": "What silicone tube for a Stirling transfer port?",
   "a": "4 mm ID × 6 mm OD, kept short (under about 30 mm), on a 4 mm barb."
  },
  {
   "q": "What wall thickness is silicone tube?",
   "a": "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."
  }
 ],
 "files_license": null,
 "offers": [
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   "license": "CC BY 4.0 (Xem Studio)",
   "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",
   "note": "silicone tube 1 ID × 3 OD, 50 mm"
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   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-2x4-50.stl",
   "note": "silicone tube 2 ID × 4 OD, 50 mm"
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  {
   "file": "silicone-tube-3x5-50",
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   "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",
   "note": "silicone tube 3 ID × 5 OD, 50 mm"
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  {
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   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-50.stl",
   "note": "silicone tube 4 ID × 6 OD, 50 mm"
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   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-5x8-50.stl",
   "note": "silicone tube 5 ID × 8 OD, 50 mm"
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   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-6x9-50.stl",
   "note": "silicone tube 6 ID × 9 OD, 50 mm"
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   "file": "silicone-tube-8x12-50",
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   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-8x12-50.stl",
   "note": "silicone tube 8 ID × 12 OD, 50 mm"
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   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-10x14-50.stl",
   "note": "silicone tube 10 ID × 14 OD, 50 mm"
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   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-20.stl",
   "note": "silicone tube 4 ID × 6 OD, cut to 20 mm"
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   "file": "silicone-tube-4x6-30",
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   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-30.stl",
   "note": "silicone tube 4 ID × 6 OD, cut to 30 mm"
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   "file": "silicone-tube-4x6-151",
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   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/silicone-tube-4x6-151.stl",
   "note": "silicone tube 4 ID × 6 OD, cut to 151 mm"
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 ],
 "markdown": "https://xemstudio.com/objects/silicone-tube/index.md"
}