{
 "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-honed-cylinder-spool",
 "name": "Tri-clamp honed cylinder spool: 2 in × 6 in, bore finished Ø48.00",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Tri-clamp engine parts",
 "year": null,
 "question": "Can a tri-clamp spool be a piston cylinder?",
 "tags": [
  "cylinder",
  "honed",
  "free piston",
  "clearance seal",
  "spool",
  "tri-clamp",
  "long earth society",
  "thermoacoustic"
 ],
 "aliases": [
  "honed tri clamp spool",
  "tri clamp piston cylinder",
  "bore a sanitary spool for a piston",
  "spool 2in 6in bored 48"
 ],
 "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-honed-cylinder-spool/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-honed-cylinder-spool/sheet.txt",
 "sheet": {
  "basis": "Standard 2 in × 6 in spool (ASME BPE tube Ø50.8 × 1.65, ISO 2852 faces) with the bore opened from Ø47.5 to Ø48.00 so it is round, straight and finished along its whole length",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A standard 6 in spool sent out to have its bore finished: Ø48.00 through the tube and both ferrules, so the free-piston mover's sleeve (Ø48.00) runs in it as a clearance seal with no contact. The finish and roundness are the machinist's to hold; the fit class says what the bore is for.",
   "Opening 47.5 to 48.00 leaves a 1.40 wall: at a 30 bar relief setting the hoop stress is p·D / 2t = 3.0 × 48 / 2.8 ≈ 51 MPa.",
   "The ferrule faces are untouched clamp faces. The Type B gasket's lip (Ø45.3) stands 1.95 into the bore at each end, so the mover never reaches the last 3 mm at either face (Mating features).",
   "On the thermoacoustic generators the alternator's coils and return shell clamp round this spool's tube: the magnets move inside, the coils stay outside, and no wire passes through the pressure wall."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "bore",
     "Ø48.00 × 152.4 (through)"
    ],
    [
     "tube OD",
     "Ø50.8"
    ],
    [
     "wall after finishing",
     "1.40"
    ],
    [
     "faces",
     "ISO 2852, 2 in"
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp honed cylinder spool: 2 in × 6 in, bore finished Ø48.00 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-honed-cylinder-spool/  (CC BY 4.0)\nBasis: Standard 2 in × 6 in spool (ASME BPE tube Ø50.8 × 1.65, ISO 2852 faces) with the bore opened from Ø47.5 to Ø48.00 so it is round, straight and finished along its whole length\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A standard 6 in spool sent out to have its bore finished: Ø48.00 through the tube and both ferrules, so the free-piston mover's sleeve (Ø48.00) runs in it as a clearance seal with no contact. The finish and roundness are the machinist's to hold; the fit class says what the bore is for.\n- Opening 47.5 to 48.00 leaves a 1.40 wall: at a 30 bar relief setting the hoop stress is p·D / 2t = 3.0 × 48 / 2.8 ≈ 51 MPa.\n- The ferrule faces are untouched clamp faces. The Type B gasket's lip (Ø45.3) stands 1.95 into the bore at each end, so the mover never reaches the last 3 mm at either face (Mating features).\n- On the thermoacoustic generators the alternator's coils and return shell clamp round this spool's tube: the magnets move inside, the coils stay outside, and no wire passes through the pressure wall.\n\nfeature  value\nbore  Ø48.00 × 152.4 (through)\ntube OD  Ø50.8\nwall after finishing  1.40\nfaces  ISO 2852, 2 in\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\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- 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- 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-honed-cylinder-spool/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-honed-cylinder-spool\n",
 "sources": [
  {
   "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": "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": "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": [
  "free-piston-mover-2in",
  "canned-linear-alternator-stator-2in",
  "tri-clamp-flexure-carrier",
  "list-ta-ring-3x2in"
 ],
 "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": "finished bore",
   "exact": "Ø48.00 × 152.4, through tube and both ferrules",
   "mates": "mover sleeve Ø48.00: clearance seal, no contact",
   "fit": "run",
   "files": "all"
  },
  {
   "feature": "faces",
   "exact": "ISO 2852, 2 in, recess opened to the Ø48.00 bore",
   "mates": "standard clamp + Type B gasket",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "tube outside",
   "exact": "Ø50.8 between the ferrule hubs",
   "mates": "stator bobbin bore Ø50.8",
   "fit": "clamp",
   "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 48.00?",
   "a": "It is the smallest round number that cleans up a 47.5 nominal sanitary bore along its whole length and leaves a usable wall."
  },
  {
   "q": "What clearance does the piston get?",
   "a": "The drawing is exact: bore and sleeve are both Ø48.00. The running fit is the machinist's: the mover's sleeve is finished to give the clearance-seal gap the fit class asks for."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "spool-2in-6in-honed-48.00",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-honed-cylinder-spool/spool-2in-6in-honed-48.00.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-honed-cylinder-spool/spool-2in-6in-honed-48.00.stl",
   "note": "2 in × 6 in spool (152.4 face to face) with the bore finished to Ø48.00 over the full length, tube and both ferrules; wall left 1.40"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-honed-cylinder-spool/index.md"
}