{
 "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": "htd-displacer-rods",
 "name": "HTD displacer rods: Ø6 × 356.7 and M6 × 83",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Tri-clamp engine parts",
 "year": null,
 "question": "How long is the displacer rod on the 10 in HTD engine?",
 "tags": [
  "htd",
  "displacer rod",
  "stirling"
 ],
 "aliases": [
  "stirling displacer rod length"
 ],
 "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/htd-displacer-rods/",
 "sheet_txt": "https://xemstudio.com/objects/htd-displacer-rods/sheet.txt",
 "sheet": {
  "basis": "Exact geometry from the engine layouts",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Main: Ø6 × 356.7, from the displacer hub's socket through the cap's guide, the bored spool and the piston's centre bore to the clevis below the crank. The guide and the piston bore are running fits (see Mating features); the piston bore is also the bleed that lets the crankcase follow the working space's mean pressure."
  ],
  "table": {
   "columns": [
    "part",
    "diameter_mm",
    "length_mm"
   ],
   "rows": [
    [
     "displacer-rod-6x356.7",
     6,
     356.7
    ]
   ]
  }
 },
 "sheet_text": "HTD displacer rods: Ø6 × 356.7 and M6 × 83 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/htd-displacer-rods/  (CC BY 4.0)\nBasis: Exact geometry from the engine layouts\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Main: Ø6 × 356.7, from the displacer hub's socket through the cap's guide, the bored spool and the piston's centre bore to the clevis below the crank. The guide and the piston bore are running fits (see Mating features); the piston bore is also the bleed that lets the crankcase follow the working space's mean pressure.\n\npart  diameter_mm  length_mm\ndisplacer-rod-6x356.7  6.0  356.7\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\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/htd-displacer-rods/index.json\nAPI: https://xemstudio.com/api/geometry?object=htd-displacer-rods\n",
 "sources": [
  {
   "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": [
  "list-htd-10in",
  "htd-displacers-10in"
 ],
 "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": "rod",
   "exact": "Ø6",
   "mates": "cap guide and piston centre bore",
   "fit": "run",
   "files": "all"
  },
  {
   "feature": "ends",
   "exact": "M6 into the displacer; Ø6 into the clevis socket with an M4 grub",
   "mates": "displacer hub, rod clevis",
   "fit": "press",
   "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": "What does the displacer rod pass through?",
   "a": "The cap's guide, the power cylinder and the piston's centre bore, to the clevis under the crank."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "displacer-rod-6x356.7",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/htd-displacer-rods/displacer-rod-6x356.7.step",
   "stl": "https://xemstudio.com/files/hardware/htd-displacer-rods/displacer-rod-6x356.7.stl",
   "note": "Ø6 × 356.7 displacer rod (main): M6 into the displacer hub, top in the clevis socket"
  }
 ],
 "markdown": "https://xemstudio.com/objects/htd-displacer-rods/index.md"
}