{
 "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": "transfer-tee-4mm",
 "name": "Transfer tee for 4 × 6 mm tube",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Drives & mechanisms",
 "year": null,
 "question": "What joins the two cylinders of an alpha Stirling engine?",
 "tags": [
  "alpha",
  "transfer",
  "tee",
  "tube fitting",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "4mm tube tee",
  "alpha stirling transfer tube",
  "transfer tee stl"
 ],
 "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/transfer-tee-4mm/",
 "sheet_txt": "https://xemstudio.com/objects/transfer-tee-4mm/sheet.txt",
 "sheet": {
  "basis": "Sockets at the 6 mm OD of 4 × 6 tube (fit: press), flow bores at its 4 mm ID",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A tee with a Ø10 body: the run along X with port faces 13 mm either side of the centre, the branch at right angles with its port face 13 mm out.",
   "Each port is a Ø6 socket 8 deep: the 6 mm OD of 4 × 6 tube pushes in (fit: press) until it bottoms 5 mm from the centre. Ø4 flow bores, the tube's ID, join the three socket floors.",
   "Same ports as the transfer elbow; the tee joins three lines (hot cylinder, cold cylinder and a third line such as a gauge)."
  ],
  "table": {
   "columns": [
    "parameter",
    "value"
   ],
   "rows": [
    [
     "body",
     "Ø10, run 26 port to port, branch 13"
    ],
    [
     "sockets",
     "Ø6 × 8 (3)"
    ],
    [
     "flow bores",
     "Ø4"
    ],
    [
     "tube end from centre",
     5
    ]
   ]
  }
 },
 "sheet_text": "Transfer tee for 4 × 6 mm tube — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/transfer-tee-4mm/  (CC BY 4.0)\nBasis: Sockets at the 6 mm OD of 4 × 6 tube (fit: press), flow bores at its 4 mm ID\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A tee with a Ø10 body: the run along X with port faces 13 mm either side of the centre, the branch at right angles with its port face 13 mm out.\n- Each port is a Ø6 socket 8 deep: the 6 mm OD of 4 × 6 tube pushes in (fit: press) until it bottoms 5 mm from the centre. Ø4 flow bores, the tube's ID, join the three socket floors.\n- Same ports as the transfer elbow; the tee joins three lines (hot cylinder, cold cylinder and a third line such as a gauge).\n\nparameter  value\nbody  Ø10, run 26 port to port, branch 13\nsockets  Ø6 × 8 (3)\nflow bores  Ø4\ntube end from centre  5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Stirling engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stirling_engine\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/transfer-tee-4mm/index.json\nAPI: https://xemstudio.com/api/geometry?object=transfer-tee-4mm\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Stirling engine",
   "url": "https://en.wikipedia.org/wiki/Stirling_engine",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "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": [
  "alpha-v-twin-syringe-frame",
  "ross-yoke-frame",
  "silicone-tube",
  "regenerator-mesh-disc",
  "list-alpha-v-twin-syringe",
  "list-ross-yoke-alpha"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "alpha-v-twin-syringe-frame",
     "why": "between the V-twin's syringe tips"
    },
    {
     "slug": "ross-yoke-frame",
     "why": "between the Ross alpha's syringe tips"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "silicone-tube",
     "why": "4 mm tube in each Ø4 bore"
    },
    {
     "slug": "plastic-syringes",
     "why": "tube to each syringe tip"
    },
    {
     "slug": "regenerator-mesh-disc",
     "why": "regenerator in the line between the cylinders"
    }
   ]
  }
 ],
 "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": "transfer-tee sockets",
   "exact": "Ø6 × 8",
   "mates": "6 mm OD of 4 × 6 tube",
   "fit": "press",
   "files": "transfer-tee-"
  },
  {
   "feature": "transfer-tee flow bores",
   "exact": "Ø4",
   "mates": "4 mm tube ID (no contact)",
   "fit": "designed",
   "files": "transfer-tee-"
  }
 ],
 "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 size tube does the transfer tee take?",
   "a": "4 × 6 tube: the 6 mm OD goes into Ø6 sockets 8 deep (fit: press); the Ø4 flow bores match the tube's ID."
  },
  {
   "q": "What turns a transfer line through 90°?",
   "a": "The transfer elbow, with the same Ø6 × 8 sockets; the two-syringe alphas on this site use elbows between their tips."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "transfer-tee-4mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/alpha-twin-crank-90/transfer-tee-4mm.step",
   "stl": "https://xemstudio.com/files/hardware/alpha-twin-crank-90/transfer-tee-4mm.stl",
   "note": "transfer tee for 4 × 6 tube: Ø10 run (port faces ±13) and branch (port face 13), Ø6 sockets 8 deep for the 6 mm tube OD, Ø4 flow bores (the tube ID)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/transfer-tee-4mm/index.md"
}