{
 "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-clamp-on-water-jacket",
 "name": "Clamp-on water jacket for a 2 in tri-clamp tube, 20 mm, with hose spigots (optional)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I water-cool a tri-clamp Stirling cooler without a jacketed spool?",
 "tags": [
  "water jacket",
  "cooler",
  "heat exchanger",
  "optional",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "clamp on water jacket tri clamp",
  "stirling cooler water jacket"
 ],
 "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-clamp-on-water-jacket/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-clamp-on-water-jacket/sheet.txt",
 "sheet": {
  "basis": "Design values: closed half-annular water chambers whose inner wall clamps on the Ø50.8 tube",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Two halves clamp onto the 3 in cooler spool above its hanger (2 × M4 × 12); each half is its own closed water chamber with a hose spigot in and out: run them in series. Heat to reject at the design point: about 53 W.",
   "Optional: without it, a wet cloth round the cooler spool or air alone will do for a short run at low charge; the engine's power falls as the cold end warms."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "length",
     20
    ],
    [
     "chamber",
     "5 deep, 1.5 walls"
    ],
    [
     "spigots",
     "Ø6 × 10, Ø4 bore"
    ]
   ]
  }
 },
 "sheet_text": "Clamp-on water jacket for a 2 in tri-clamp tube, 20 mm, with hose spigots (optional) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-clamp-on-water-jacket/  (CC BY 4.0)\nBasis: Design values: closed half-annular water chambers whose inner wall clamps on the Ø50.8 tube\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Two halves clamp onto the 3 in cooler spool above its hanger (2 × M4 × 12); each half is its own closed water chamber with a hose spigot in and out: run them in series. Heat to reject at the design point: about 53 W.\n- Optional: without it, a wet cloth round the cooler spool or air alone will do for a short run at low charge; the engine's power falls as the cold end warms.\n\nfeature  value\nlength  20.0\nchamber  5 deep, 1.5 walls\nspigots  Ø6 × 10, Ø4 bore\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\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-clamp-on-water-jacket/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-clamp-on-water-jacket\n",
 "sources": [
  {
   "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": [
  "fpse-fin-inserts",
  "tri-clamp-spool",
  "list-fpse-generator-2in"
 ],
 "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": "S3 tube OD",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "split",
   "exact": "1.0 total (0.5 per half)",
   "mates": "the other half",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "hose spigots",
   "exact": "Ø6 × 10, Ø4 bore",
   "mates": "6 mm ID hose",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "ear holes",
   "exact": "Ø4.5",
   "mates": "M4 clearance (ISO 273 medium)",
   "fit": "designed",
   "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": "Is it required?",
   "a": "No: optional, like every heat exchanger on this engine."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "water-jacket-half-2in-20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-clamp-on-water-jacket/water-jacket-half-2in-20.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-clamp-on-water-jacket/water-jacket-half-2in-20.stl",
   "note": "water jacket half (optional): 20 long, inner wall on Ø50.8, closed 5 mm water chamber, hose spigots Ø6 × 10 (Ø4 bore), ears with one M4"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-clamp-on-water-jacket/index.md"
}