{
 "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-heat-shield",
 "name": "Tri-clamp heat shield washer: 0.6 mm, ½ to 4 in tube",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Tri-clamp engine parts",
 "year": null,
 "question": "What goes between the flame and a tri-clamp clamp?",
 "tags": [
  "tri-clamp",
  "heat shield",
  "washer",
  "stirling",
  "hot end",
  "long earth society"
 ],
 "aliases": [
  "tri clamp heat shield",
  "clamp heat shield washer",
  "stirling hot end shield"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 6,
 "url": "https://xemstudio.com/objects/tri-clamp-heat-shield/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-heat-shield/sheet.txt",
 "sheet": {
  "basis": "Washer: bore = flange OD (C3), OD = clamp OD + 16, 0.6 mm thick",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A flat washer that slides over a ferrule rim (bore = flange OD) and rests on the hot-end clamp, so the flame's plume is turned away from the tube and the parts above the hot joint.",
   "Bore = flange OD (25.0 / 50.5 / 64.0 / 77.5 / 91.0 / 119.0); OD = clamp OD + 16 (Ø50 / 75.5 / 89 / 102.5 / 116 / 144), 0.6 mm thick.",
   "It goes on from the open end of the spool before the cold-end head and its clamp; it drops down the tube onto the hot clamp."
  ],
  "table": {
   "columns": [
    "size_in",
    "bore_mm",
    "od_mm",
    "thickness_mm"
   ],
   "rows": [
    [
     "¾",
     25,
     50,
     0.6
    ],
    [
     "1½",
     50.5,
     75.5,
     0.6
    ],
    [
     "2",
     64,
     89,
     0.6
    ],
    [
     "2½",
     77.5,
     102.5,
     0.6
    ],
    [
     "3",
     91,
     116,
     0.6
    ],
    [
     "4",
     119,
     144,
     0.6
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp heat shield washer: 0.6 mm, ½ to 4 in tube — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-heat-shield/  (CC BY 4.0)\nBasis: Washer: bore = flange OD (C3), OD = clamp OD + 16, 0.6 mm thick\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A flat washer that slides over a ferrule rim (bore = flange OD) and rests on the hot-end clamp, so the flame's plume is turned away from the tube and the parts above the hot joint.\n- Bore = flange OD (25.0 / 50.5 / 64.0 / 77.5 / 91.0 / 119.0); OD = clamp OD + 16 (Ø50 / 75.5 / 89 / 102.5 / 116 / 144), 0.6 mm thick.\n- It goes on from the open end of the spool before the cold-end head and its clamp; it drops down the tube onto the hot clamp.\n\nsize_in  bore_mm  od_mm  thickness_mm\n¾  25.0  50.0  0.6\n1½  50.5  75.5  0.6\n2  64.0  89.0  0.6\n2½  77.5  102.5  0.6\n3  91.0  116.0  0.6\n4  119.0  144.0  0.6\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ISO: ISO 2852:1993 Stainless steel clamp pipe couplings for the food industry — standard — ISO [verify license at link] — https://www.iso.org/standard/7873.html\n- Long Earth Society: Tri-clamp Stirling engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/tri-clamp-heat-shield/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-heat-shield\n",
 "sources": [
  {
   "publisher": "ISO",
   "title": "ISO 2852:1993 Stainless steel clamp pipe couplings for the food industry",
   "url": "https://www.iso.org/standard/7873.html",
   "formats": [
    "standard"
   ],
   "license": "ISO",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Tri-clamp Stirling 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-clamps",
  "tri-clamp-hot-gasket",
  "tri-clamp-spool"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "tri-clamp-spool",
     "why": "bore = flange OD, slides over the rim and down the tube"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "tri-clamp-clamps",
     "why": "rests on the hot-end clamp (OD = clamp OD + 16)"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "tri-clamp-hot-gasket",
     "why": "flat gasket at the same hot joint"
    }
   ]
  }
 ],
 "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": "heat-shield bore",
   "exact": "flange OD (C3)",
   "mates": "ferrule rim it passes over; rests on the clamp",
   "fit": "slide",
   "files": "heat-shield-"
  }
 ],
 "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": "What size heat shield for a 2 inch tri-clamp?",
   "a": "Ø89 × Ø64 bore × 0.6 mm: it passes over the 2 in ferrule rim and sits on the 73 mm clamp with 8 mm to spare all round."
  },
  {
   "q": "How does the heat shield go on a finished spool?",
   "a": "Its bore is the flange OD, so it slides over the rim from the open end of the spool and down the tube onto the hot-end clamp."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "heat-shield-0.75in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-0.75in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-0.75in.stl",
   "note": "0.75 in heat shield washer Ø50 OD (clamp OD + 16) × Ø25 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint"
  },
  {
   "file": "heat-shield-1.5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-1.5in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-1.5in.stl",
   "note": "1.5 in heat shield washer Ø75.5 OD (clamp OD + 16) × Ø50.5 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint"
  },
  {
   "file": "heat-shield-2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-2in.stl",
   "note": "2 in heat shield washer Ø89 OD (clamp OD + 16) × Ø64 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint"
  },
  {
   "file": "heat-shield-2.5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-2.5in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-2.5in.stl",
   "note": "2.5 in heat shield washer Ø102.5 OD (clamp OD + 16) × Ø77.5 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint"
  },
  {
   "file": "heat-shield-3in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-3in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-3in.stl",
   "note": "3 in heat shield washer Ø116 OD (clamp OD + 16) × Ø91 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint"
  },
  {
   "file": "heat-shield-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-4in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-clamps/heat-shield-4in.stl",
   "note": "4 in heat shield washer Ø144 OD (clamp OD + 16) × Ø119 bore (= flange OD) × 0.6: slides over a ferrule rim and rests on the hot-end clamp, shading the tube above the joint"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-heat-shield/index.md"
}