{
 "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-closed-hot-spool-bored",
 "name": "2 in × 152.4 mm closed-end hot spool, bore finished Ø48.00",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I spec a one-piece closed tri-clamp hot end for a pressurised Stirling engine?",
 "tags": [
  "hot end",
  "closed end spool",
  "bored",
  "custom spool",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "closed end tri clamp spool",
  "stirling hot end tri clamp",
  "custom sanitary spool spec",
  "welded closed end spool"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/tri-clamp-closed-hot-spool-bored/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-closed-hot-spool-bored/sheet.txt",
 "sheet": {
  "basis": "ISO 2852 face and ASME BPE 2 in tube as the ferrule and spools on this site; the closed end and the finished bore are design values",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A fabrication spec: a standard 2 in ferrule end, 16 ga tube and a 3 mm closed end welded into one piece, 152.4 mm (6 in) from the face to the outer end, 1.5 mm outer round on the end. Plain outside: the fin sleeve and the water jacket are separate parts that slide or clamp on. Nothing that seals is near the flame; the only joint is the clamp face.",
   "After the end is closed, the bore is finished Ø48.00 from the face to the floor (149.4 deep). That size cleans up any 2 in tube within its OD and wall tolerances, and the slotted liner's fin tips are a press fit in it.",
   "Inside, from the face: the liner's cold ring and ports, the cooler zone (z 9–54, under the water jacket), the regenerator (54–94), the heater zone (94–144, under the fin sleeve) and the hot space at the floor.",
   "I use it on both performance engines: lying down in the horizontal gamma and standing in the charged beta."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "face",
     "ISO 2852 2 in"
    ],
    [
     "face to outer end",
     152.39999999999998
    ],
    [
     "closed end",
     "3, 1.5 outer round"
    ],
    [
     "finished bore",
     "Ø48.00 × 149.4"
    ]
   ]
  }
 },
 "sheet_text": "2 in × 152.4 mm closed-end hot spool, bore finished Ø48.00 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-closed-hot-spool-bored/  (CC BY 4.0)\nBasis: ISO 2852 face and ASME BPE 2 in tube as the ferrule and spools on this site; the closed end and the finished bore are design values\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A fabrication spec: a standard 2 in ferrule end, 16 ga tube and a 3 mm closed end welded into one piece, 152.4 mm (6 in) from the face to the outer end, 1.5 mm outer round on the end. Plain outside: the fin sleeve and the water jacket are separate parts that slide or clamp on. Nothing that seals is near the flame; the only joint is the clamp face.\n- After the end is closed, the bore is finished Ø48.00 from the face to the floor (149.4 deep). That size cleans up any 2 in tube within its OD and wall tolerances, and the slotted liner's fin tips are a press fit in it.\n- Inside, from the face: the liner's cold ring and ports, the cooler zone (z 9–54, under the water jacket), the regenerator (54–94), the heater zone (94–144, under the fin sleeve) and the hot space at the floor.\n- I use it on both performance engines: lying down in the horizontal gamma and standing in the charged beta.\n\nfeature  value\nface  ISO 2852 2 in\nface to outer end  152.39999999999998\nclosed end  3, 1.5 outer round\nfinished bore  Ø48.00 × 149.4\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, 1 parts): https://xemstudio.com/files/hardware/tri-clamp-closed-hot-spool-bored/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-closed-hot-spool-bored\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": [
  "tri-clamp-ring-fin-sleeve",
  "tri-clamp-flow-water-jacket",
  "stirling-slotted-regenerator-liner",
  "tri-clamp-spool-bored-honed",
  "list-tri-clamp-horizontal-gamma",
  "list-tri-clamp-charged-beta"
 ],
 "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": "face",
   "exact": "ISO 2852 2 in (land Ø56.5–Ø64, rim 2.85, 1.6 recess, 20° back)",
   "mates": "Type B gasket, 2 in clamp",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "finished bore",
   "exact": "Ø48.00 × 149.4 (face to floor)",
   "mates": "liner cold ring Ø48.00 (slide) and fin tips Ø48.00 (press)",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "tube OD",
   "exact": "Ø50.8",
   "mates": "fin sleeve bore, water-jacket halves, cradle seat",
   "fit": "slide",
   "files": "all"
  },
  {
   "feature": "closed end",
   "exact": "flat outer face, 1.5 round",
   "mates": "fin sleeve inside bottom",
   "fit": "slide",
   "files": "all"
  }
 ],
 "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": "Why a closed end instead of a cap?",
   "a": "A gasket in the flame is the first thing to fail on a charged engine. A closed end puts the only joint at the cold face."
  },
  {
   "q": "Why bore it?",
   "a": "Stock 2 in tube is made to its OD and wall, not its bore. Finishing the bore to Ø48.00 makes it round and on size for the liner's press fit."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "hot-spool-2in-152.4-closed-bored-48.00",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-closed-hot-spool-bored/hot-spool-2in-152.4-closed-bored-48.00.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-closed-hot-spool-bored/hot-spool-2in-152.4-closed-bored-48.00.stl",
   "note": "2 in × 152.4 closed-end hot spool, one piece: ISO 2852 face, Ø50.8 × 1.65 tube, 3.0 closed end with a 1.5 outer round; bore finished Ø48.00 × 149.4 (to the floor)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-closed-hot-spool-bored/index.md"
}