{
 "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-flexure-carrier",
 "name": "Tri-clamp flexure carrier: clamp-in 2 in, two Ø40 flexure stacks",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Tri-clamp engine parts",
 "year": null,
 "question": "Where do the flexure bearings of a sealed free piston go in a tri-clamp engine?",
 "tags": [
  "flexure",
  "carrier",
  "free piston",
  "clamp-in",
  "tri-clamp",
  "long earth society",
  "thermoacoustic"
 ],
 "aliases": [
  "flexure bearing holder tri clamp",
  "clamp in flexure plate",
  "free piston flexure mount"
 ],
 "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-flexure-carrier/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-flexure-carrier/sheet.txt",
 "sheet": {
  "basis": "ISO 2852 faces as the ferrule on this site; ledge hole circle = the Ø40 spiral flexure's rim holes (r 17.6)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A part with a full 2 in ferrule face on each side, clamped between the honed cylinder and the next fitting like a thick gasket (each side its own gasket and clamp). Inside, two ledges carry two flexure stacks of Ø40 spiral leaves 48 mm apart, so the piston's rod is held on centre at two points and the mover never touches the bore.",
   "Stack A hangs under the upper ledge, stack B stands on the lower ledge; each is leaf, spacer, leaf (opposite hand), clamp plate, with three M3 × 10 into the ledge. The rod passes the Ø31 ledge windows; M4 nuts and washers clamp the leaf hubs.",
   "The carrier's inside is part of the gas space behind the piston.",
   "Fits: faces are clamp faces; the M3 holes are tap drills; the ledge windows are clearance (designed)."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "face to face",
     "60"
    ],
    [
     "ledges",
     "Ø31 window, 4 thick"
    ],
    [
     "holes",
     "3 × M3 on r 17.6"
    ]
   ]
  }
 },
 "sheet_text": "Tri-clamp flexure carrier: clamp-in 2 in, two Ø40 flexure stacks — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-flexure-carrier/  (CC BY 4.0)\nBasis: ISO 2852 faces as the ferrule on this site; ledge hole circle = the Ø40 spiral flexure's rim holes (r 17.6)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A part with a full 2 in ferrule face on each side, clamped between the honed cylinder and the next fitting like a thick gasket (each side its own gasket and clamp). Inside, two ledges carry two flexure stacks of Ø40 spiral leaves 48 mm apart, so the piston's rod is held on centre at two points and the mover never touches the bore.\n- Stack A hangs under the upper ledge, stack B stands on the lower ledge; each is leaf, spacer, leaf (opposite hand), clamp plate, with three M3 × 10 into the ledge. The rod passes the Ø31 ledge windows; M4 nuts and washers clamp the leaf hubs.\n- The carrier's inside is part of the gas space behind the piston.\n- Fits: faces are clamp faces; the M3 holes are tap drills; the ledge windows are clearance (designed).\n\nfeature  value\nface to face  60\nledges  Ø31 window, 4 thick\nholes  3 × M3 on r 17.6\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\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- 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- 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-flexure-carrier/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-flexure-carrier\n",
 "sources": [
  {
   "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": "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": "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": [
  "spiral-flexure-bearing",
  "free-piston-mover-2in",
  "tri-clamp-clamp-in-bearing-plate",
  "list-ta-ring-3x2in"
 ],
 "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": "ledge holes",
   "exact": "2 × 3 × Ø2.5 (M3 tap drill) on r 17.6",
   "mates": "shcs-m3x10 through the flexure stacks",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "ledge windows",
   "exact": "Ø31 × 4",
   "mates": "leaf arms, hubs and hub nuts at ±8 stroke (no contact)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "ledge faces",
   "exact": "flat ring Ø31–Ø47.5",
   "mates": "flexure leaf rims",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "neck",
   "exact": "Ø50.8",
   "mates": "spool hanger (ring engine)",
   "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 clamp-in?",
   "a": "The stacks must sit inside the pressure boundary on the same axis as the cylinder; a part with a ferrule face both sides does that and keeps every joint a standard clamp joint."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "flexure-carrier-2in-60",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-flexure-carrier/flexure-carrier-2in-60.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-flexure-carrier/flexure-carrier-2in-60.stl",
   "note": "flexure carrier 60 face to face: ISO 2852 2 in face each side on a Ø50.8 neck, Ø47.5 bore, ledges Ø47.5 / Ø31 × 4 at 6–10 and 50–54 from the top face, 3 × M3 tap drill Ø2.5 on r 17.6 each"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-flexure-carrier/index.md"
}