{
 "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-yokes",
 "name": "Rod-end yokes with a side stub pin: Ø5 tube and Ø3 rod",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I connect a con-rod to a rod without blocking the rod's axis?",
 "tags": [
  "yoke",
  "rod end",
  "con-rod",
  "linkage",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "rod end yoke",
  "side pin rod end",
  "coaxial rod con-rod connection"
 ],
 "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-yokes/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-rd-yokes/sheet.txt",
 "sheet": {
  "basis": "Design values; Ø3 dowel (ISO 8734) stub pin, 623 con-rod eyes from the con-rod kit on this site",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A small block on the rod end with a Ø3 dowel pressed 4.5 mm into its side: the con-rod's 623 runs on the 7.5 mm that stand out, beside the block, so the rod's axis stays free.",
   "The tube yoke has a Ø3.4 passage above its Ø5 socket: in the beta the Ø3 displacer rod runs up through the power piston's tube rod and out of the top of this yoke to its own rod yoke.",
   "Both hold their rod with an M3 grub."
  ],
  "table": {
   "columns": [
    "part",
    "socket_mm",
    "pin_height_mm",
    "height_mm",
    "stub_pin"
   ],
   "rows": [
    [
     "rd-yoke-tube5",
     "Ø5 × 12",
     17,
     21,
     "Ø3 × 12, 4.5 in"
    ],
    [
     "rd-yoke-rod3",
     "Ø3 × 10",
     14,
     18,
     "Ø3 × 12, 4.5 in"
    ]
   ]
  }
 },
 "sheet_text": "Rod-end yokes with a side stub pin: Ø5 tube and Ø3 rod — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-rd-yokes/  (CC BY 4.0)\nBasis: Design values; Ø3 dowel (ISO 8734) stub pin, 623 con-rod eyes from the con-rod kit on this site\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A small block on the rod end with a Ø3 dowel pressed 4.5 mm into its side: the con-rod's 623 runs on the 7.5 mm that stand out, beside the block, so the rod's axis stays free.\n- The tube yoke has a Ø3.4 passage above its Ø5 socket: in the beta the Ø3 displacer rod runs up through the power piston's tube rod and out of the top of this yoke to its own rod yoke.\n- Both hold their rod with an M3 grub.\n\npart  socket_mm  pin_height_mm  height_mm  stub_pin\nrd-yoke-tube5  Ø5 × 12  17.0  21.0  Ø3 × 12, 4.5 in\nrd-yoke-rod3  Ø3 × 10  14.0  18.0  Ø3 × 12, 4.5 in\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, 2 parts): https://xemstudio.com/files/hardware/tri-clamp-rd-yokes/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-rd-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": [
  "tri-clamp-rd-power-head",
  "tri-clamp-rd-piston",
  "connecting-rods-623",
  "dowel-pins-metric"
 ],
 "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": "tube socket",
   "exact": "Ø5 × 12",
   "mates": "Ø5 tube rod (M3 grub)",
   "fit": "slide",
   "files": "rd-yoke-tube5"
  },
  {
   "feature": "rod passage",
   "exact": "Ø3.4",
   "mates": "Ø3 displacer rod (no contact)",
   "fit": "designed",
   "files": "rd-yoke-tube5"
  },
  {
   "feature": "rod socket",
   "exact": "Ø3 × 10",
   "mates": "Ø3 rod (M3 grub)",
   "fit": "slide",
   "files": "rd-yoke-rod3"
  },
  {
   "feature": "stub-pin hole",
   "exact": "Ø3 × 4.5",
   "mates": "Ø3 × 12 dowel",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "grub hole",
   "exact": "Ø2.5",
   "mates": "M3 tap drill",
   "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": "Why a stub pin instead of a clevis?",
   "a": "A clevis pin crosses the rod's axis; the beta needs a second rod to pass straight through, so the pin stands out to one side."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "rd-yoke-tube5",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-rd-yokes/rd-yoke-tube5.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-rd-yokes/rd-yoke-tube5.stl",
   "note": "tube-rod yoke 12 × 14 × 21: Ø5 socket 12 deep with an M3 grub (Ø2.5), Ø3.4 passage above it, Ø3 stub-pin hole 4.5 deep in the −Y face at 17"
  },
  {
   "file": "rd-yoke-rod3",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-rd-yokes/rd-yoke-rod3.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-rd-yokes/rd-yoke-rod3.stl",
   "note": "rod yoke 12 × 14 × 18: Ø3 socket 10 deep with an M3 grub (Ø2.5), Ø3 stub-pin hole 4.5 deep in the −Y face at 14"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-rd-yokes/index.md"
}