{
 "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-finned-cooler",
 "name": "Tri-clamp finned cooler: clamp-on halves for a 2 in tube",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I cool the cold side of a tri-clamp Stirling engine?",
 "tags": [
  "cooler",
  "fins",
  "heat sink",
  "cold end",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "tri clamp heat sink",
  "finned tri clamp cooler",
  "stirling cold side fins",
  "clamp on fins 2 inch tube"
 ],
 "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-finned-cooler/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-finned-cooler/sheet.txt",
 "sheet": {
  "basis": "ASME BPE 2 in tube OD (Ø50.8); clearance under a standard clamp; fin sizes are design values",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Two halves close on the tube OD between the clamps of a 3 in spool (61.9 mm of plain tube); each half is 56 long with a 3 mm sleeve and nine Ø88 × 2 fins at 6 mm pitch.",
   "The halves leave 1 mm between them; four M4 × 30 screws and nuts through the ears pull them onto the tube (clamp fit).",
   "The fins clear the clamps: the clamp ring reaches 7.1 mm past the ferrule face, the cooler starts 3 mm beyond that."
  ],
  "table": {
   "columns": [
    "size_in",
    "bore_mm",
    "length_mm",
    "fin_od_mm",
    "fins",
    "screws"
   ],
   "rows": [
    [
     "2",
     50.8,
     56,
     88,
     9,
     "4 × M4 × 30 + nuts"
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp finned cooler: clamp-on halves for a 2 in tube — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-finned-cooler/  (CC BY 4.0)\nBasis: ASME BPE 2 in tube OD (Ø50.8); clearance under a standard clamp; fin sizes are design values\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Two halves close on the tube OD between the clamps of a 3 in spool (61.9 mm of plain tube); each half is 56 long with a 3 mm sleeve and nine Ø88 × 2 fins at 6 mm pitch.\n- The halves leave 1 mm between them; four M4 × 30 screws and nuts through the ears pull them onto the tube (clamp fit).\n- The fins clear the clamps: the clamp ring reaches 7.1 mm past the ferrule face, the cooler starts 3 mm beyond that.\n\nsize_in  bore_mm  length_mm  fin_od_mm  fins  screws\n2  50.8  56.0  88.0  9  4 × M4 × 30 + nuts\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-finned-cooler/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-finned-cooler\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-jacket-shell",
  "sanitary-clamp-spools",
  "tri-clamp-clamps",
  "list-tri-clamp-elbow-diaphragm-alpha"
 ],
 "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": "bore",
   "exact": "Ø50.8",
   "mates": "2 in tube OD",
   "fit": "clamp",
   "files": "cooler-half-"
  },
  {
   "feature": "ear holes",
   "exact": "Ø4.5",
   "mates": "M4 clearance (ISO 273 medium)",
   "fit": "designed",
   "files": "cooler-half-"
  }
 ],
 "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": "Does it fit between the clamps of a 3 in spool?",
   "a": "Yes: 56 mm on 61.9 mm of plain tube, 3 mm clear of each clamp."
  },
  {
   "q": "Is there a liquid-cooled option?",
   "a": "The jacket shell on this site clamps on the same tube in the same place."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "cooler-half-2in-56",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-finned-cooler/cooler-half-2in-56.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-finned-cooler/cooler-half-2in-56.stl",
   "note": "clamp-on finned cooler half for the 2 in tube OD (Ø50.8 bore) × 56: 3 mm sleeve, fins Ø88 × 2 at 6 pitch, ears with 2 × Ø4.5 (M4) each side"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-finned-cooler/index.md"
}