{
 "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": "stirling-crosshead-yokes",
 "name": "Crosshead yokes with a Ø5 stub wrist pin: Ø6, Ø8 and hollow Ø10 rods",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I join a con-rod to a piston rod outside the cylinder?",
 "tags": [
  "yoke",
  "crosshead",
  "wrist pin",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "crosshead yoke",
  "stub pin rod end"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 3,
 "url": "https://xemstudio.com/objects/stirling-crosshead-yokes/",
 "sheet_txt": "https://xemstudio.com/objects/stirling-crosshead-yokes/sheet.txt",
 "sheet": {
  "basis": "Design values; Ø5 dowel (ISO 8734) stub pin with a 625 in the con-rod's small end",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A block on the rod's end with a Ø5 dowel pressed 6 mm into its side: the con-rod's 625 runs on the pin beside the block and a Ø5 shaft collar holds it. The rod's axis stays clear, so in the beta the displacer rod passes straight up through the hollow rod's yoke (and its 6 × 10 × 10 bushing guides it there)."
  ],
  "table": {
   "columns": [
    "part",
    "socket",
    "pin height",
    "block"
   ],
   "rows": [
    [
     "yoke-rod6-m6",
     "M6 × 12",
     15,
     "14 × 14 × 24"
    ],
    [
     "yoke-rod8-m8",
     "M8 × 12",
     16,
     "14 × 14 × 26"
    ],
    [
     "yoke-tube10-m10x1",
     "M10 × 1 × 16",
     22,
     "14 × 24 × 30"
    ]
   ]
  }
 },
 "sheet_text": "Crosshead yokes with a Ø5 stub wrist pin: Ø6, Ø8 and hollow Ø10 rods — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/stirling-crosshead-yokes/  (CC BY 4.0)\nBasis: Design values; Ø5 dowel (ISO 8734) stub pin with a 625 in the con-rod's small end\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A block on the rod's end with a Ø5 dowel pressed 6 mm into its side: the con-rod's 625 runs on the pin beside the block and a Ø5 shaft collar holds it. The rod's axis stays clear, so in the beta the displacer rod passes straight up through the hollow rod's yoke (and its 6 × 10 × 10 bushing guides it there).\n\npart  socket  pin height  block\nyoke-rod6-m6  M6 × 12  15  14 × 14 × 24\nyoke-rod8-m8  M8 × 12  16  14 × 14 × 26\nyoke-tube10-m10x1  M10 × 1 × 16  22  14 × 24 × 30\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, 3 parts): https://xemstudio.com/files/hardware/stirling-crosshead-yokes/index.json\nAPI: https://xemstudio.com/api/geometry?object=stirling-crosshead-yokes\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": [
  "stirling-conrods-626-625",
  "stirling-precision-rods",
  "list-tri-clamp-horizontal-gamma",
  "list-tri-clamp-charged-beta"
 ],
 "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 sockets",
   "exact": "M6 (Ø5.0 × 12) / M8 (Ø6.8 × 12) / M10 × 1 (Ø9.0 × 16)",
   "mates": "rod ends",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "stub-pin hole",
   "exact": "Ø5 × 6",
   "mates": "Ø5 dowel wrist pin",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "bushing seat",
   "exact": "Ø10 × 10 at the top",
   "mates": "6 × 10 × 10 sleeve bushing (guides the displacer rod)",
   "fit": "press",
   "files": "yoke-tube10"
  }
 ],
 "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 not a clevis?",
   "a": "A clevis pin crosses the rod's axis; the beta's coaxial rods need the axis clear."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "yoke-rod6-m6",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/stirling-crosshead-yokes/yoke-rod6-m6.step",
   "stl": "https://xemstudio.com/files/hardware/stirling-crosshead-yokes/yoke-rod6-m6.stl",
   "note": "crosshead yoke 14 × 14 × 24 for the rod6 rod: tapped socket from the bottom, Ø5 stub-pin hole 6 deep in the −Y face at 15"
  },
  {
   "file": "yoke-rod8-m8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/stirling-crosshead-yokes/yoke-rod8-m8.step",
   "stl": "https://xemstudio.com/files/hardware/stirling-crosshead-yokes/yoke-rod8-m8.stl",
   "note": "crosshead yoke 14 × 14 × 26 for the rod8 rod: tapped socket from the bottom, Ø5 stub-pin hole 6 deep in the −Y face at 16"
  },
  {
   "file": "yoke-tube10-m10x1",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/stirling-crosshead-yokes/yoke-tube10-m10x1.step",
   "stl": "https://xemstudio.com/files/hardware/stirling-crosshead-yokes/yoke-tube10-m10x1.stl",
   "note": "crosshead yoke 14 × 14 × 30 for the tube10 rod: tapped socket from the bottom, Ø5 stub-pin hole 6 deep in the −Y face at 22, Ø7 passage and Ø10 × 10 bushing seat at the top"
  }
 ],
 "markdown": "https://xemstudio.com/objects/stirling-crosshead-yokes/index.md"
}