{
 "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-clamp-in-bearing-plate",
 "name": "Clamp-in bearing plate: 2 in, two ISO 2852 faces, spigot with two 623 seats",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I carry a crankshaft inside a sealed tri-clamp vessel without a shaft seal?",
 "tags": [
  "bearing plate",
  "bearing",
  "crankcase",
  "sealed",
  "623",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "tri clamp bearing plate",
  "bearing between tri clamp ferrules",
  "sealed crankcase bearing tri clamp",
  "clamp in bearing",
  "tri clamp spacer plate"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/tri-clamp-clamp-in-bearing-plate/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-clamp-in-bearing-plate/sheet.txt",
 "sheet": {
  "basis": "ISO 2852 face and 20° back (as the ferrule and the flat end cap) on both sides, ASME BPE tube OD for the neck; 16 mm face to face so two standard 2 in clamps (15.97 wide each) sit side by side over 1.7 mm gaskets; 623 bearing 3 × 10 × 4 (ISO 15)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A plate clamped between two faces like a thick gasket: each side is an ISO 2852 face (land Ø56.5–Ø64, 2.85 rim, 1.6 recess inside Ø56.5) with the 20° back down to the tube OD, the two joined by a Ø50.8 neck. Each side takes its own Type B gasket and clamp; the two clamps sit 1.74 mm apart.",
   "Inside: a Ø16 spigot runs 52.1 mm inward from the inner face with a 623 seat at its end; a second 623 seat sits 3.1–7.1 mm inside the inner face; a Ø4 bore joins them, clear of the Ø3 shaft. The shaft never leaves the vessel: the plate's outer face holds a Ø44 pocket for a Ø42 pocket flywheel on the shaft end, and a flat end cap clamps over it.",
   "Four Ø4 vents join the pocket to the crankcase, so the pocket is crankcase gas too. The sealed generator uses two, one in each branch of the cross.",
   "Fits: the faces are clamp faces; the seats press on the 623 outer rings; the Ø4 and Ø12 bores are clearance (designed)."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "faces",
     "ISO 2852 both sides, 2 in"
    ],
    [
     "face to face",
     16
    ],
    [
     "neck",
     "Ø50.8"
    ],
    [
     "spigot",
     "Ø16 × 52.1 from the inner face"
    ],
    [
     "bearing seats",
     "2 × Ø10 × 4 (623)"
    ],
    [
     "shaft bore",
     "Ø4 (no contact)"
    ],
    [
     "flywheel pocket",
     "Ø44 × 6.2, Ø12 hub bore"
    ],
    [
     "vents",
     "4 × Ø4 on Ø34"
    ]
   ]
  }
 },
 "sheet_text": "Clamp-in bearing plate: 2 in, two ISO 2852 faces, spigot with two 623 seats — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-clamp-in-bearing-plate/  (CC BY 4.0)\nBasis: ISO 2852 face and 20° back (as the ferrule and the flat end cap) on both sides, ASME BPE tube OD for the neck; 16 mm face to face so two standard 2 in clamps (15.97 wide each) sit side by side over 1.7 mm gaskets; 623 bearing 3 × 10 × 4 (ISO 15)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A plate clamped between two faces like a thick gasket: each side is an ISO 2852 face (land Ø56.5–Ø64, 2.85 rim, 1.6 recess inside Ø56.5) with the 20° back down to the tube OD, the two joined by a Ø50.8 neck. Each side takes its own Type B gasket and clamp; the two clamps sit 1.74 mm apart.\n- Inside: a Ø16 spigot runs 52.1 mm inward from the inner face with a 623 seat at its end; a second 623 seat sits 3.1–7.1 mm inside the inner face; a Ø4 bore joins them, clear of the Ø3 shaft. The shaft never leaves the vessel: the plate's outer face holds a Ø44 pocket for a Ø42 pocket flywheel on the shaft end, and a flat end cap clamps over it.\n- Four Ø4 vents join the pocket to the crankcase, so the pocket is crankcase gas too. The sealed generator uses two, one in each branch of the cross.\n- Fits: the faces are clamp faces; the seats press on the 623 outer rings; the Ø4 and Ø12 bores are clearance (designed).\n\nfeature  value\nfaces  ISO 2852 both sides, 2 in\nface to face  16.0\nneck  Ø50.8\nspigot  Ø16 × 52.1 from the inner face\nbearing seats  2 × Ø10 × 4 (623)\nshaft bore  Ø4 (no contact)\nflywheel pocket  Ø44 × 6.2, Ø12 hub bore\nvents  4 × Ø4 on Ø34\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, 1 parts): https://xemstudio.com/files/hardware/tri-clamp-clamp-in-bearing-plate/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-clamp-in-bearing-plate\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-bearing-cap",
  "tri-clamp-crankcase-flywheel",
  "tri-clamp-end-cap",
  "tri-clamp-clamps",
  "ball-bearings-metric",
  "list-tri-clamp-sealed-diaphragm-generator"
 ],
 "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": "faces",
   "exact": "ISO 2852 both sides (land Ø56.5–Ø64, rim 2.85, 1.6 recess, 20° back to Ø50.8)",
   "mates": "standard clamps + Type B gaskets",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "bearing seats",
   "exact": "2 × Ø10 × 4 (spigot end; 3.1–7.1 inside the inner face)",
   "mates": "623 outer ring",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "shaft bore",
   "exact": "Ø4",
   "mates": "Ø3 crankshaft (no contact)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "hub bore and flywheel pocket",
   "exact": "Ø12; Ø44 × 6.2",
   "mates": "pocket-flywheel hub Ø10 and disc Ø42 (1 mm radial, 1 mm behind)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "spigot",
   "exact": "Ø16",
   "mates": "inside the 2 in branch bore (no contact)",
   "fit": "designed",
   "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": "Will two clamps fit on one plate?",
   "a": "Yes: each 2 in clamp reaches 7.98 mm from its joint plane, the joint planes are 17.7 mm apart (16 + 1.7), so 1.74 mm is left between the clamps."
  },
  {
   "q": "Where are the bearings?",
   "a": "One 623 at the spigot end, 52.1 mm in from the inner face, one 3.1 mm inside the inner face; the crank sits between the two plates' spigots."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "bearing-plate-2in-623",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-clamp-in-bearing-plate/bearing-plate-2in-623.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-clamp-in-bearing-plate/bearing-plate-2in-623.stl",
   "note": "clamp-in bearing plate: ISO 2852 face (land Ø56.5–Ø64, rim 2.85, recess 1.6) and 20° back on both sides, Ø50.8 neck, 16 face to face; Ø16 spigot 52.1 inward with a 623 seat at its end, 623 seat 3.1–7.1 inside the inner face, Ø4 bore between; Ø12 bore and Ø44 × 6.2 flywheel pocket in the outer face; 4 × Ø4 vents"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-clamp-in-bearing-plate/index.md"
}