{
 "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-rd-gland-caps",
 "name": "Tri-clamp gland caps, 2 in: end caps with a rod gland, an M5 port and a stop bridge or bell-crank post",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I take a displacer rod out of the top of a tri-clamp tee?",
 "tags": [
  "cap",
  "gland",
  "tri-clamp",
  "ringbom",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "tri clamp cap rod gland",
  "ringbom stirling cap",
  "end cap with bushing",
  "displacer rod gland tri clamp"
 ],
 "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-rd-gland-caps/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-rd-gland-caps/sheet.txt",
 "sheet": {
  "basis": "ISO 2852 face, recess and 20° back cone as the flat end cap on this site; pedestal clear of the 2 in clamp; rod, bushing and port sizes are design values",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A 2 in end cap with the rod's gland on its back. It closes the top of the run of a standard 2 in equal tee with a Type B gasket and a 2 in clamp, like any end cap; a Ø50.8 pedestal lifts everything on its back clear of the clamp.",
   "Ringbom cap: the Ø8 rod runs in an 8 × 12 × 20 bushing at the top of a Ø36 boss; an 8 mm collar on the rod stops on the boss top and under a bridge 26 mm up, so the free displacer travels 18 mm.",
   "Gamma cap: the Ø3 displacer rod runs in two 3 × 5 × 6 bushings, one at each end of the gland; a post on a Ø64 platform carries the bell crank's pivot 89.5 mm above the face.",
   "Both caps have an M5 tapped port from the pedestal into the cap's recess: a plug, a gauge, or a one-way valve that lets air in when the gas falls below air pressure (it keeps the rolling diaphragm the right way round)."
  ],
  "table": {
   "columns": [
    "part",
    "top_mm",
    "rod",
    "gland"
   ],
   "rows": [
    [
     "ringbom",
     30,
     "Ø8",
     "8 × 12 × 20"
    ],
    [
     "gamma",
     22,
     "Ø3",
     "2 × 3 × 5 × 6"
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp gland caps, 2 in: end caps with a rod gland, an M5 port and a stop bridge or bell-crank post — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-rd-gland-caps/  (CC BY 4.0)\nBasis: ISO 2852 face, recess and 20° back cone as the flat end cap on this site; pedestal clear of the 2 in clamp; rod, bushing and port sizes are design values\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A 2 in end cap with the rod's gland on its back. It closes the top of the run of a standard 2 in equal tee with a Type B gasket and a 2 in clamp, like any end cap; a Ø50.8 pedestal lifts everything on its back clear of the clamp.\n- Ringbom cap: the Ø8 rod runs in an 8 × 12 × 20 bushing at the top of a Ø36 boss; an 8 mm collar on the rod stops on the boss top and under a bridge 26 mm up, so the free displacer travels 18 mm.\n- Gamma cap: the Ø3 displacer rod runs in two 3 × 5 × 6 bushings, one at each end of the gland; a post on a Ø64 platform carries the bell crank's pivot 89.5 mm above the face.\n- Both caps have an M5 tapped port from the pedestal into the cap's recess: a plug, a gauge, or a one-way valve that lets air in when the gas falls below air pressure (it keeps the rolling diaphragm the right way round).\n\npart  top_mm  rod  gland\nringbom  30.0  Ø8  8 × 12 × 20\ngamma  22.0  Ø3  2 × 3 × 5 × 6\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-rd-gland-caps/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-rd-gland-caps\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-rd-tee-inserts",
  "sanitary-clamp-tees",
  "tri-clamp-end-cap",
  "tri-clamp-gasket",
  "list-tri-clamp-rd-ringbom",
  "list-tri-clamp-rd-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": "clamp face",
   "exact": "ISO 2852 2 in face, 1.6 recess (the flat end cap's)",
   "mates": "Type B gasket on the top of a 2 in tee's run, 2 in clamp",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "pedestal",
   "exact": "Ø50.8 to 10 above the face",
   "mates": "clamp inner Ø52.8 (no contact)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "M5 port",
   "exact": "Ø4.2",
   "mates": "M5 tap drill (plug, gauge or one-way valve)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "bushing seat",
   "exact": "Ø12 × 20",
   "mates": "8 × 12 × 20 sleeve bushing",
   "fit": "press",
   "files": "rd-gland-cap-2in-ringbom"
  },
  {
   "feature": "rod way",
   "exact": "Ø9",
   "mates": "Ø8 Ringbom rod (no contact)",
   "fit": "designed",
   "files": "rd-gland-cap-2in-ringbom"
  },
  {
   "feature": "bridge hole",
   "exact": "Ø10",
   "mates": "Ø8 Ringbom rod (no contact)",
   "fit": "designed",
   "files": "rd-gland-cap-2in-ringbom"
  },
  {
   "feature": "bushing seats",
   "exact": "Ø5 × 6 (two)",
   "mates": "3 × 5 × 6 sleeve bushings",
   "fit": "press",
   "files": "rd-gland-cap-2in-gamma"
  },
  {
   "feature": "rod way",
   "exact": "Ø4",
   "mates": "Ø3 displacer rod (no contact)",
   "fit": "designed",
   "files": "rd-gland-cap-2in-gamma"
  },
  {
   "feature": "pivot hole",
   "exact": "Ø3",
   "mates": "Ø3 × 16 dowel (bell-crank pivot)",
   "fit": "press",
   "files": "rd-gland-cap-2in-gamma"
  }
 ],
 "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 fitting does it go on?",
   "a": "The top of the run of a standard 2 in equal tee, or any 2 in ferrule: it is an end cap with things on its back."
  },
  {
   "q": "What is the M5 port for?",
   "a": "A plug, a pressure gauge, or a one-way valve that lets air in so the gas never drops below air pressure."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "rd-gland-cap-2in-ringbom",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-rd-gland-caps/rd-gland-cap-2in-ringbom.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-rd-gland-caps/rd-gland-cap-2in-ringbom.stl",
   "note": "2 in Ringbom gland cap: flat end cap face (ISO 2852, recess 1.6), Ø50.8 pedestal to 10, Ø36 boss to 30 with an Ø12 × 20 bushing seat at the top, Ø9 rod way, two posts and a bridge 26 above the top (Ø10 hole), M5 port (Ø4.2) at x -21"
  },
  {
   "file": "rd-gland-cap-2in-gamma",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-rd-gland-caps/rd-gland-cap-2in-gamma.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-rd-gland-caps/rd-gland-cap-2in-gamma.stl",
   "note": "2 in gamma gland cap: flat end cap face, Ø50.8 pedestal to 10, Ø64 × 4 platform, Ø16 boss to 22, Ø5 × 6 seats for two 3 × 5 × 6 bushings and an Ø4 rod way between, bell-crank post at x 30 with an Ø3 pivot hole 89.54 above the face, M5 port (Ø4.2) at x -21"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-rd-gland-caps/index.md"
}