{
 "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-cross-branch-plug",
 "name": "Branch plugs for a 2 in tri-clamp cross crankcase",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I fill the side branch of a 2 inch tri-clamp cross?",
 "tags": [
  "filler",
  "plug",
  "cross",
  "dead volume",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "tri clamp cross plug",
  "cross branch filler",
  "stirling dead volume plug"
 ],
 "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-cross-branch-plug/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-cross-branch-plug/sheet.txt",
 "sheet": {
  "basis": "ASME BPE 2 in bore Ø47.5; ISO 2852 Type B lip Ø45.3 and cap recess 1.6; the saddle is the Ø47.5 run bore",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A branch plug fills a 2 in cross branch from the crank chamber to the cap: Ø47.5 up to the gasket lip, then Ø45.3 through the lip to the cap's recess floor, so no gas is left in the joint.",
   "Its inner end is cut by the Ø47.5 run, so it meets the crankcase insert face to face, and a Ø29 nose runs on into the insert's crank chamber up to the crank. The blind plug goes on the end-cap side; the bored one (Ø16) takes the bearing cap's spigot.",
   "Fits: Ø47.5 slide in the bore; Ø45.3 touches the lip; the Ø16 bore is a slide fit on the spigot."
  ],
  "table": {
   "columns": [
    "file",
    "nose_end_mm",
    "bore"
   ],
   "rows": [
    [
     "branch-plug-2in-blind",
     15.5,
     "none"
    ],
    [
     "branch-plug-2in-bore16",
     13.5,
     "Ø16"
    ]
   ]
  }
 },
 "sheet_text": "Branch plugs for a 2 in tri-clamp cross crankcase — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-cross-branch-plug/  (CC BY 4.0)\nBasis: ASME BPE 2 in bore Ø47.5; ISO 2852 Type B lip Ø45.3 and cap recess 1.6; the saddle is the Ø47.5 run bore\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A branch plug fills a 2 in cross branch from the crank chamber to the cap: Ø47.5 up to the gasket lip, then Ø45.3 through the lip to the cap's recess floor, so no gas is left in the joint.\n- Its inner end is cut by the Ø47.5 run, so it meets the crankcase insert face to face, and a Ø29 nose runs on into the insert's crank chamber up to the crank. The blind plug goes on the end-cap side; the bored one (Ø16) takes the bearing cap's spigot.\n- Fits: Ø47.5 slide in the bore; Ø45.3 touches the lip; the Ø16 bore is a slide fit on the spigot.\n\nfile  nose_end_mm  bore\nbranch-plug-2in-blind  15.5  none\nbranch-plug-2in-bore16  13.5  Ø16\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 (clamp fitting dimensions, tube OD and wall) — 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-cross-branch-plug/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-cross-branch-plug\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 (clamp fitting dimensions, tube OD and wall)",
   "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-cross-crankcase-insert",
  "tri-clamp-bearing-cap",
  "sanitary-clamp-crosses",
  "list-tri-clamp-cross-diaphragm-gamma"
 ],
 "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": "outside",
   "exact": "Ø47.5",
   "mates": "2 in cross branch bore",
   "fit": "slide",
   "files": "all"
  },
  {
   "feature": "lip spigot",
   "exact": "Ø45.3 to the cap recess floor",
   "mates": "Type B gasket lip (ID 45.3) and the cap",
   "fit": "slide",
   "files": "all"
  },
  {
   "feature": "saddle",
   "exact": "Ø47.5 cylinder across the plug",
   "mates": "crankcase insert outside",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "nose",
   "exact": "Ø29",
   "mates": "crank chamber of the insert",
   "fit": "slide",
   "files": "all"
  },
  {
   "feature": "spigot bore",
   "exact": "Ø16",
   "mates": "bearing-cap spigot",
   "fit": "slide",
   "files": "branch-plug-2in-bore16"
  },
  {
   "feature": "hub pockets",
   "exact": "Ø22 × 4 and Ø12 × 10",
   "mates": "hub web and hub turning in them",
   "fit": "designed",
   "files": "branch-plug-2in-bore16"
  }
 ],
 "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 the saddle end?",
   "a": "The insert in the run is a Ø47.5 cylinder; a flat end would leave about 6 mL of gas between them on each side."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "branch-plug-2in-blind",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-cross-branch-plug/branch-plug-2in-blind.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-cross-branch-plug/branch-plug-2in-blind.stl",
   "note": "2 in cross branch plug: Ø47.5 from the saddle to 86.95, Ø45.3 to 92.20 (from the cross centre), Ø29 nose to 15.5; end-cap side"
  },
  {
   "file": "branch-plug-2in-bore16",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-cross-branch-plug/branch-plug-2in-bore16.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-cross-branch-plug/branch-plug-2in-bore16.stl",
   "note": "2 in cross branch plug as the blind one with the nose to 13.5 and a Ø16 bore for the bearing cap's spigot"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-cross-branch-plug/index.md"
}