{
 "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-dome-lids",
 "name": "Tri-clamp dome lids: 1½ to 12 in, plain or with a port at the crown",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Sanitary clamp fittings",
 "year": null,
 "question": "Is there a domed tri-clamp lid with a port on top?",
 "tags": [
  "dome",
  "domed lid",
  "lid",
  "dome cap",
  "bowl",
  "sanitary",
  "tri-clamp",
  "clamp fitting",
  "brewing",
  "homebrew"
 ],
 "aliases": [
  "tri clamp dome lid",
  "domed end cap tri clamp",
  "6 inch tri clamp lid",
  "tri clamp dome with port",
  "fermenter dome lid tri clamp"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 16,
 "url": "https://xemstudio.com/objects/tri-clamp-dome-lids/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-dome-lids/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design: an F&D head (crown radius = OD, knuckle 6 %) on a short skirt of the size's tube, with the ISO 2852 face; ports are a ½ NPT Class 3000 half coupling or a 1½ in clamp nozzle",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Domed lids for the same size of ferrule, vessel or spool. The dome sheds condensate back into the vessel and leaves headspace; the crown port takes an airlock, a blow-off, a thermowell or a spunding valve through a 1½ in clamp or ½ NPT.",
   "Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40."
  ],
  "table": {
   "columns": [
    "size_in",
    "tube_od_mm",
    "dome_height_mm"
   ],
   "rows": [
    [
     "1½",
     38.1,
     6.5
    ],
    [
     "2",
     50.8,
     8.6
    ],
    [
     "3",
     76.2,
     12.9
    ],
    [
     "4",
     101.6,
     17.2
    ],
    [
     "6",
     152.4,
     25.8
    ],
    [
     "8",
     203.2,
     34.4
    ],
    [
     "10",
     254,
     43
    ],
    [
     "12",
     304.8,
     51.6
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp dome lids: 1½ to 12 in, plain or with a port at the crown — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-dome-lids/  (CC BY 4.0)\nBasis: Xem Studio design: an F&D head (crown radius = OD, knuckle 6 %) on a short skirt of the size's tube, with the ISO 2852 face; ports are a ½ NPT Class 3000 half coupling or a 1½ in clamp nozzle\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Domed lids for the same size of ferrule, vessel or spool. The dome sheds condensate back into the vessel and leaves headspace; the crown port takes an airlock, a blow-off, a thermowell or a spunding valve through a 1½ in clamp or ½ NPT.\n- Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40.\n\nsize_in  tube_od_mm  dome_height_mm\n1½  38.1  6.5\n2  50.8  8.6\n3  76.2  12.9\n4  101.6  17.2\n6  152.4  25.8\n8  203.2  34.4\n10  254.0  43.0\n12  304.8  51.6\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ASME: Flanged and dished (F&D) heads: crown radius = OD, knuckle radius 6 % of OD (BPVC Section VIII torispherical head) — standard — ASME; proportions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/bpvc-viii-1-bpvc-section-viii-rules-for-construction-of-pressure-vessels-division-1\n- ASME: B1.20.1 Pipe threads, general purpose (NPT): major diameter, L2, tap drill; B16.11 forged fittings (Class 3000 couplings); B36.10 Sch 40 bore — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/b1-20-1-pipe-threads-general-purpose-inch\n- GW Kent: Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness — web — publisher's guide; dimensions cited — https://www.gwkent.com/triclamp-guide\n- Rubber Fab: Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50) — PDF — maker chart; dimensions are facts [verify license at link] — https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 16 parts): https://xemstudio.com/files/hardware/tri-clamp-dome-lids/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-dome-lids\n",
 "sources": [
  {
   "publisher": "ASME",
   "title": "Flanged and dished (F&D) heads: crown radius = OD, knuckle radius 6 % of OD (BPVC Section VIII torispherical head)",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/bpvc-viii-1-bpvc-section-viii-rules-for-construction-of-pressure-vessels-division-1",
   "formats": [
    "standard"
   ],
   "license": "ASME; proportions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "ASME",
   "title": "B1.20.1 Pipe threads, general purpose (NPT): major diameter, L2, tap drill; B16.11 forged fittings (Class 3000 couplings); B36.10 Sch 40 bore",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/b1-20-1-pipe-threads-general-purpose-inch",
   "formats": [
    "standard"
   ],
   "license": "ASME; dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "GW Kent",
   "title": "Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness",
   "url": "https://www.gwkent.com/triclamp-guide",
   "formats": [
    "web"
   ],
   "license": "publisher's guide; dimensions cited",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Rubber Fab",
   "title": "Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50)",
   "url": "https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf",
   "formats": [
    "PDF"
   ],
   "license": "maker chart; dimensions are facts",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "tri-clamp-dished-bottom-vessels",
  "tri-clamp-ported-end-caps",
  "tri-clamp-thermowells"
 ],
 "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": [],
 "faq": [
  {
   "q": "What goes in the crown port?",
   "a": "Anything with a 1½ in clamp (airlock cap, thermowell, blow-off) or a ½ NPT fitting."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "dome-lid-1.5in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-1.5in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-1.5in.stl",
   "note": "1½ in dome lid (F&D head), 14.6 from the face to the crown"
  },
  {
   "file": "dome-lid-2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-2in.stl",
   "note": "2 in dome lid (F&D head), 16.9 from the face to the crown"
  },
  {
   "file": "dome-lid-2in-half-npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-2in-half-npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-2in-half-npt.stl",
   "note": "2 in dome lid with a ½ NPT half coupling at the crown (tap-drill bore Ø18.3)"
  },
  {
   "file": "dome-lid-3in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-3in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-3in.stl",
   "note": "3 in dome lid (F&D head), 21.4 from the face to the crown"
  },
  {
   "file": "dome-lid-3in-half-npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-3in-half-npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-3in-half-npt.stl",
   "note": "3 in dome lid with a ½ NPT half coupling at the crown (tap-drill bore Ø18.3)"
  },
  {
   "file": "dome-lid-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-4in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-4in.stl",
   "note": "4 in dome lid (F&D head), 26.2 from the face to the crown"
  },
  {
   "file": "dome-lid-4in-half-npt",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-4in-half-npt.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-4in-half-npt.stl",
   "note": "4 in dome lid with a ½ NPT half coupling at the crown (tap-drill bore Ø18.3)"
  },
  {
   "file": "dome-lid-4in-1.5in-port",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-4in-1.5in-port.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-4in-1.5in-port.stl",
   "note": "4 in dome lid with a 1½ in clamp port at the crown, 51.6 from the face to the port face"
  },
  {
   "file": "dome-lid-6in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-6in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-6in.stl",
   "note": "6 in dome lid (F&D head), 34.3 from the face to the crown"
  },
  {
   "file": "dome-lid-6in-1.5in-port",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-6in-1.5in-port.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-6in-1.5in-port.stl",
   "note": "6 in dome lid with a 1½ in clamp port at the crown, 59.7 from the face to the port face"
  },
  {
   "file": "dome-lid-8in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-8in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-8in.stl",
   "note": "8 in dome lid (F&D head), 42.9 from the face to the crown"
  },
  {
   "file": "dome-lid-8in-1.5in-port",
   "formats": [
    "step",
    "stl"
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   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-8in-1.5in-port.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-8in-1.5in-port.stl",
   "note": "8 in dome lid with a 1½ in clamp port at the crown, 68.3 from the face to the port face"
  },
  {
   "file": "dome-lid-10in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-10in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-10in.stl",
   "note": "10 in dome lid (F&D head), 51.5 from the face to the crown"
  },
  {
   "file": "dome-lid-10in-1.5in-port",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-10in-1.5in-port.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-10in-1.5in-port.stl",
   "note": "10 in dome lid with a 1½ in clamp port at the crown, 76.9 from the face to the port face"
  },
  {
   "file": "dome-lid-12in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-12in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-12in.stl",
   "note": "12 in dome lid (F&D head), 60.1 from the face to the crown"
  },
  {
   "file": "dome-lid-12in-1.5in-port",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-12in-1.5in-port.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-dome-lids/dome-lid-12in-1.5in-port.stl",
   "note": "12 in dome lid with a 1½ in clamp port at the crown, 85.5 from the face to the port face"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-dome-lids/index.md"
}