{
 "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-elbow-4mm",
 "name": "Transfer elbow for 4 × 6 mm tube: a 90° turn in a syringe engine's transfer line",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Drives & mechanisms",
 "year": null,
 "question": "How do I turn a 4 mm ID silicone transfer line through 90° between two syringe tips?",
 "tags": [
  "elbow",
  "tube",
  "fitting",
  "transfer",
  "stirling",
  "syringe",
  "long earth society"
 ],
 "aliases": [
  "4mm tube elbow",
  "6mm od tube 90 degree elbow",
  "silicone tube elbow",
  "stirling transfer tube elbow"
 ],
 "overall_mm": {
  "length": 18,
  "width": 18,
  "height": 10
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/transfer-elbow-4mm/",
 "sheet_txt": "https://xemstudio.com/objects/transfer-elbow-4mm/sheet.txt",
 "sheet": {
  "basis": "Tube sizes from the silicone-tube entry (4 ID × 6 OD); sockets drawn at the tube OD, flow bore at the tube ID",
  "overall_mm": {
   "length": 18,
   "width": 18,
   "height": 10
  },
  "notes": [
   "Two Ø10 arms at 90° meet in a rounded corner. Each arm ends in a port face 13 mm from the corner with a Ø6 socket 8 deep: the 6 mm OD tube pushes in until its end bottoms 5 mm from the corner. A Ø4 flow bore (the tube's ID) joins the two socket floors through the corner.",
   "Used where a transfer line has to turn: two on the can engine (up from the cap barb, across, up into the Luer tip), two on the Ross yoke alpha (tips up, 40 mm apart: up, across, down), three on the alpha V-twin (tips pointing away from each other at ±45°).",
   "The sockets take the tube's OD exactly (see Mating features)."
  ],
  "table": {
   "columns": [
    "feature",
    "size_mm"
   ],
   "rows": [
    [
     "arm OD",
     10
    ],
    [
     "port face from corner",
     13
    ],
    [
     "socket",
     "Ø6 × 8"
    ],
    [
     "tube end from corner",
     5
    ],
    [
     "flow bore",
     "Ø4"
    ]
   ]
  }
 },
 "sheet_text": "Transfer elbow for 4 × 6 mm tube: a 90° turn in a syringe engine's transfer line — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/transfer-elbow-4mm/  (CC BY 4.0)\nBasis: Tube sizes from the silicone-tube entry (4 ID × 6 OD); sockets drawn at the tube OD, flow bore at the tube ID\nCatalog version: 2026-10-20\n\nOverall (mm): length 18.0, width 18.0, height 10\n- Two Ø10 arms at 90° meet in a rounded corner. Each arm ends in a port face 13 mm from the corner with a Ø6 socket 8 deep: the 6 mm OD tube pushes in until its end bottoms 5 mm from the corner. A Ø4 flow bore (the tube's ID) joins the two socket floors through the corner.\n- Used where a transfer line has to turn: two on the can engine (up from the cap barb, across, up into the Luer tip), two on the Ross yoke alpha (tips up, 40 mm apart: up, across, down), three on the alpha V-twin (tips pointing away from each other at ±45°).\n- The sockets take the tube's OD exactly (see Mating features).\n\nfeature  size_mm\narm OD  10\nport face from corner  13.0\nsocket  Ø6 × 8\ntube end from corner  5.0\nflow bore  Ø4\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/transfer-elbow-4mm/index.json\nAPI: https://xemstudio.com/api/geometry?object=transfer-elbow-4mm\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": [
  "silicone-tube",
  "transfer-tee-4mm",
  "plastic-syringes",
  "list-alpha-v-twin-syringe",
  "list-ross-yoke-alpha",
  "list-can-engine"
 ],
 "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": "sockets",
   "exact": "Ø6 × 8",
   "mates": "6 mm OD of 4 × 6 tube",
   "fit": "press",
   "files": "transfer-elbow-"
  },
  {
   "feature": "flow bore",
   "exact": "Ø4",
   "mates": "4 mm tube ID (no contact)",
   "fit": "designed",
   "files": "transfer-elbow-"
  }
 ],
 "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": "How far does the tube go into the transfer elbow?",
   "a": "8 mm, to the socket floor; the tube end then sits 5 mm from the corner and the Ø4 bore carries on round it."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "transfer-elbow-4mm",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/transfer-elbow-4mm/transfer-elbow-4mm.step",
   "stl": "https://xemstudio.com/files/hardware/transfer-elbow-4mm/transfer-elbow-4mm.stl",
   "note": "90° transfer elbow for 4 × 6 tube: Ø10 arms, port faces 13 from the corner, Ø6 sockets 8 deep, Ø4 flow bore"
  }
 ],
 "markdown": "https://xemstudio.com/objects/transfer-elbow-4mm/index.md"
}