{
 "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": "tri-clamp-tee-filler-plugs",
 "name": "Filler plugs for a 2 in tee: run plug with the displacer-rod bore and branch plug, with a Ø12 gas passage",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I use a standard 2 in tee in a Stirling engine without its dead volume?",
 "tags": [
  "filler",
  "insert",
  "tee",
  "dead volume",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "tri clamp tee filler plug",
  "stirling dead volume filler"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 2,
 "url": "https://xemstudio.com/objects/tri-clamp-tee-filler-plugs/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-tee-filler-plugs/sheet.txt",
 "sheet": {
  "basis": "Stock 2 in tee bore Ø47.5 (ASME BPE); passage size from the cycle model",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A standard 2 in tee holds about 390 mL of gas. Two inserts fill it: a run plug (slid in from a run end) and a branch plug whose saddle-shaped bottom sits on it. What is left is a Ø12 passage from the hot spool's side up to the power cylinder, the displacer rod's Ø6.6 bore and a Ø4 hole to the gland cap's ports.",
   "Gas left in the tee and its joints about 25.9 mL; Ø44 spigots reach through each gasket's lip to 0.5 mm from what they face."
  ],
  "table": {
   "columns": [
    "part",
    "size"
   ],
   "rows": [
    [
     "tee-run-plug-2in-rod6",
     "Ø47.50 × 172.9, spigots Ø44"
    ],
    [
     "tee-branch-plug-2in",
     "Ø47.50 to 86.45, spigot Ø44"
    ]
   ]
  }
 },
 "sheet_text": "Filler plugs for a 2 in tee: run plug with the displacer-rod bore and branch plug, with a Ø12 gas passage — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-tee-filler-plugs/  (CC BY 4.0)\nBasis: Stock 2 in tee bore Ø47.5 (ASME BPE); passage size from the cycle model\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A standard 2 in tee holds about 390 mL of gas. Two inserts fill it: a run plug (slid in from a run end) and a branch plug whose saddle-shaped bottom sits on it. What is left is a Ø12 passage from the hot spool's side up to the power cylinder, the displacer rod's Ø6.6 bore and a Ø4 hole to the gland cap's ports.\n- Gas left in the tee and its joints about 25.9 mL; Ø44 spigots reach through each gasket's lip to 0.5 mm from what they face.\n\npart  size\ntee-run-plug-2in-rod6  Ø47.50 × 172.9, spigots Ø44\ntee-branch-plug-2in  Ø47.50 to 86.45, spigot Ø44\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ISO (via iTeh sample): ISO 2852 clamp liners: face profile and flange / groove diameters — PDF — standard excerpt; dimensions are facts — https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf\n- ASME: BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall) — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment\n- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/tri-clamp-tee-filler-plugs/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-tee-filler-plugs\n",
 "sources": [
  {
   "publisher": "ISO (via iTeh sample)",
   "title": "ISO 2852 clamp liners: face profile and flange / groove diameters",
   "url": "https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf",
   "formats": [
    "PDF"
   ],
   "license": "standard excerpt; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ASME",
   "title": "BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall)",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment",
   "formats": [
    "standard"
   ],
   "license": "ASME; dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine 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": [
  "list-tri-clamp-walking-beam-gamma",
  "sanitary-clamp-tees"
 ],
 "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": [
  {
   "feature": "outside",
   "exact": "Ø47.50",
   "mates": "2 in tee bore",
   "fit": "slide",
   "files": "all"
  },
  {
   "feature": "spigots",
   "exact": "Ø44.0",
   "mates": "inside the gasket lips (no contact)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "rod bore",
   "exact": "Ø6.6",
   "mates": "Ø6 displacer rod (no contact)",
   "fit": "designed",
   "files": "tee-run-plug"
  },
  {
   "feature": "saddle",
   "exact": "Ø47.50 cylinder",
   "mates": "run plug (rests on it)",
   "fit": "designed",
   "files": "tee-branch-plug"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "Do they seal?",
   "a": "No, they only fill: the gasket and clamps seal. The fit in the bore is a slide fit."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "tee-run-plug-2in-rod6",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-tee-filler-plugs/tee-run-plug-2in-rod6.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-tee-filler-plugs/tee-run-plug-2in-rod6.stl",
   "note": "run filler Ø47.50 × 172.9 for a 2 in tee with Ø44 spigots to x ±92.05 / 91.70, Ø6.6 rod bore, Ø12 passages (z 12 axial, x 0 up), Ø4 to the +X end"
  },
  {
   "file": "tee-branch-plug-2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-tee-filler-plugs/tee-branch-plug-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-tee-filler-plugs/tee-branch-plug-2in.stl",
   "note": "branch filler Ø47.50 from the run bore to 86.45, Ø44 spigot to 92.05, Ø12 passage on the axis"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-tee-filler-plugs/index.md"
}