{
 "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-flow-water-jacket",
 "name": "Clamp-on flow water jacket for 2 in tube (two halves, hose spigots)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I water-cool a plain tri-clamp tube?",
 "tags": [
  "water jacket",
  "cooler",
  "heat exchanger",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "tri clamp water jacket",
  "clamp on cooling jacket 2 inch"
 ],
 "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-flow-water-jacket/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-flow-water-jacket/sheet.txt",
 "sheet": {
  "basis": "Design values; M4 clearance holes ISO 273 medium",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Two halves bolted round the tube with four M4 screws; each half is its own water space with two Ø8 hose spigots (in and out), so the two run in series with a short hose between them. The inner wall is pressed on the tube by the bolts.",
   "On the performance engines it sits over the cooler zone, 9.5 mm behind the clamp face (a 2 in clamp reaches 7.13 mm).",
   "Optional: without it the cold end runs hot and the power falls; a wet rag on the cold end is the minimum."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "bore",
     "Ø50.8 × 48"
    ],
    [
     "water space",
     "r 27.4–31.4"
    ],
    [
     "spigots",
     "2 per half, Ø8 × 10"
    ],
    [
     "bolts",
     "4 × M4"
    ]
   ]
  }
 },
 "sheet_text": "Clamp-on flow water jacket for 2 in tube (two halves, hose spigots) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-flow-water-jacket/  (CC BY 4.0)\nBasis: Design values; M4 clearance holes ISO 273 medium\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Two halves bolted round the tube with four M4 screws; each half is its own water space with two Ø8 hose spigots (in and out), so the two run in series with a short hose between them. The inner wall is pressed on the tube by the bolts.\n- On the performance engines it sits over the cooler zone, 9.5 mm behind the clamp face (a 2 in clamp reaches 7.13 mm).\n- Optional: without it the cold end runs hot and the power falls; a wet rag on the cold end is the minimum.\n\nfeature  value\nbore  Ø50.8 × 48\nwater space  r 27.4–31.4\nspigots  2 per half, Ø8 × 10\nbolts  4 × M4\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-flow-water-jacket/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-flow-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": [
  "tri-clamp-closed-hot-spool-bored",
  "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": "bore",
   "exact": "Ø50.8 × 48",
   "mates": "2 in 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": "ear holes",
   "exact": "Ø4.5",
   "mates": "M4 clearance (ISO 273 medium)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "hose spigots",
   "exact": "Ø8 × 10, Ø5 bore",
   "mates": "8 mm ID hose",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "start behind the clamp face",
   "exact": "9.5",
   "mates": "a 2 in clamp reaches 7.13 behind the face",
   "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": "Which way does the water go?",
   "a": "In at the spigot farther from the clamp face, out at the nearer one; put the outlets up so the jacket purges its air."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "water-jacket-half-2in-48-flow",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-flow-water-jacket/water-jacket-half-2in-48-flow.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-flow-water-jacket/water-jacket-half-2in-48-flow.stl",
   "note": "clamp-on flow water-jacket half for 2 in tube: bore Ø50.8 × 48, inner wall 2, water space 4, outer wall 2, end walls 2; ears with 2 × Ø4.5; two Ø8 × 10 hose spigots (Ø5 bore) on the crown"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-flow-water-jacket/index.md"
}