{
 "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-leaf-half-gasket",
 "name": "Tri-clamp half gasket for a clamped leaf or rim: 2 in, web 0.6 or 0.45",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I seal a flat plate clamped in a tri-clamp joint?",
 "tags": [
  "gasket",
  "tri-clamp",
  "half gasket",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "half gasket tri clamp",
  "gasket for plate in tri clamp joint",
  "flexure gasket"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 2,
 "url": "https://xemstudio.com/objects/tri-clamp-leaf-half-gasket/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-leaf-half-gasket/sheet.txt",
 "sheet": {
  "basis": "ISO 2852 Type B section split at the joint plane: bead into one face's 1.6 recess with the Type B's 0.3 squeeze, web so that two webs and the plate make the 1.7 joint",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Two of them sandwich a flat plate (a flexure leaf, the liner's rim) in a 2 in joint: each bead fills its ferrule's recess, each web lies on its land, the plate between the webs. Web 0.6 for a 0.5 plate, 0.45 for a 0.8 plate: 0.6 + 0.5 + 0.6 = 0.45 + 0.8 + 0.45 = 1.7, the Type B web, so the clamp closes as usual.",
   "Ratings, as facts: the gasket must be rated above the relief setting (15 bar gauge) at its temperature; helium permeates silicone faster than PTFE; PTFE cold-flows under sustained load and heat. Cut or ordered to this drawing."
  ],
  "table": {
   "columns": [
    "web_mm",
    "plate_mm",
    "bead_mm",
    "od_mm",
    "id_mm"
   ],
   "rows": [
    [
     0.6,
     0.5,
     1.9,
     63,
     47.5
    ],
    [
     0.45,
     0.8,
     1.9,
     63,
     47.5
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp half gasket for a clamped leaf or rim: 2 in, web 0.6 or 0.45 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-leaf-half-gasket/  (CC BY 4.0)\nBasis: ISO 2852 Type B section split at the joint plane: bead into one face's 1.6 recess with the Type B's 0.3 squeeze, web so that two webs and the plate make the 1.7 joint\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Two of them sandwich a flat plate (a flexure leaf, the liner's rim) in a 2 in joint: each bead fills its ferrule's recess, each web lies on its land, the plate between the webs. Web 0.6 for a 0.5 plate, 0.45 for a 0.8 plate: 0.6 + 0.5 + 0.6 = 0.45 + 0.8 + 0.45 = 1.7, the Type B web, so the clamp closes as usual.\n- Ratings, as facts: the gasket must be rated above the relief setting (15 bar gauge) at its temperature; helium permeates silicone faster than PTFE; PTFE cold-flows under sustained load and heat. Cut or ordered to this drawing.\n\nweb_mm  plate_mm  bead_mm  od_mm  id_mm\n0.6  0.5  1.9  63  47.5\n0.45  0.8  1.9  63  47.5\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 (tube OD and wall, clamp fittings) — 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, 2 parts): https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-leaf-half-gasket\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 (tube OD and wall, clamp fittings)",
   "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-flexure-leaf",
  "fpse-displacer-cylinder",
  "sanitary-high-pressure-clamp",
  "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": "bead",
   "exact": "Ø47.5–Ø56.5 × 1.9",
   "mates": "ferrule face recess 1.6 (0.3 squeeze)",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "web",
   "exact": "0.6 / 0.45 thick to Ø63",
   "mates": "ferrule land and the leaf or rim",
   "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 not a Type B gasket each side?",
   "a": "Two full gaskets plus the plate would be 1.7 + 1.7 + plate: too thick for the clamp to close."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "leaf-half-gasket-2in-w0.6",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/leaf-half-gasket-2in-w0.6.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/leaf-half-gasket-2in-w0.6.stl",
   "note": "half gasket: web 0.60 thick from Ø47.5 to Ø63, bead Ø47.5–Ø56.5 × 1.9 into one face's recess (1.6 + 0.3 squeeze); two per leaf, beads outward"
  },
  {
   "file": "leaf-half-gasket-2in-w0.45",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/leaf-half-gasket-2in-w0.45.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-leaf-half-gasket/leaf-half-gasket-2in-w0.45.stl",
   "note": "half gasket: web 0.45 thick from Ø47.5 to Ø63, bead Ø47.5–Ø56.5 × 1.9 into one face's recess (1.6 + 0.3 squeeze); two per leaf, beads outward"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-leaf-half-gasket/index.md"
}