{
 "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": "oldham-coupling",
 "name": "Oldham coupling (parallel-offset shaft coupling)",
 "kind": "hardware",
 "category": "Mechanisms",
 "group": "Couplings & joints",
 "year": null,
 "question": "How does an Oldham coupling handle offset shafts?",
 "tags": [
  "mechanism",
  "couplings & joints",
  "kinematics"
 ],
 "aliases": [
  "oldham coupling",
  "oldham coupler",
  "z axis oldham coupling"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/oldham-coupling/",
 "sheet_txt": "https://xemstudio.com/objects/oldham-coupling/sheet.txt",
 "sheet": {
  "basis": "Xem Studio drawing; classic mechanism",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Two hubs with face tongues at 90° to each other and a centre disc slotted on both faces: the disc slides on both tongues, so shafts that are parallel but offset turn together.",
   "Speed is exactly 1:1 (no cyclic error, unlike a universal joint); the disc centre orbits at twice shaft speed with a radius of half the offset.",
   "Common on 3D-printer Z lead screws and pumps.",
   "Parts (each has its own page): oldham-coupling-hub-40, oldham-coupling-disc-40, shaft-couplers."
  ],
  "table": {
   "columns": [
    "parameter",
    "value"
   ],
   "rows": [
    [
     "diameter",
     "40 mm"
    ],
    [
     "max offset",
     "≈2 mm for this size"
    ],
    [
     "bores",
     "Ø5"
    ]
   ]
  }
 },
 "sheet_text": "Oldham coupling (parallel-offset shaft coupling) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/oldham-coupling/  (CC BY 4.0)\nBasis: Xem Studio drawing; classic mechanism\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Two hubs with face tongues at 90° to each other and a centre disc slotted on both faces: the disc slides on both tongues, so shafts that are parallel but offset turn together.\n- Speed is exactly 1:1 (no cyclic error, unlike a universal joint); the disc centre orbits at twice shaft speed with a radius of half the offset.\n- Common on 3D-printer Z lead screws and pumps.\n- Parts (each has its own page): oldham-coupling-hub-40, oldham-coupling-disc-40, shaft-couplers.\n\nparameter  value\ndiameter  40 mm\nmax offset  ≈2 mm for this size\nbores  Ø5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/oldham-coupling/index.json\nAPI: https://xemstudio.com/api/geometry?object=oldham-coupling\n",
 "sources": [
  {
   "publisher": "Xem Studio",
   "title": "drawing",
   "url": "https://xemstudio.com/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "oldham-coupling-hub-40",
  "oldham-coupling-disc-40",
  "shaft-couplers"
 ],
 "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": [],
 "faq": [
  {
   "q": "How does an Oldham coupling handle offset shafts?",
   "a": "Two hubs with face tongues at 90° to each other and a centre disc slotted on both faces: the disc slides on both tongues, so shafts that are parallel but offset turn together."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "oldham-coupling-assembly",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/oldham-coupling/oldham-coupling-assembly.step",
   "stl": "https://xemstudio.com/files/hardware/oldham-coupling/oldham-coupling-assembly.stl",
   "note": "Assembled mechanism, all parts placed (STEP keeps each part separate)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/oldham-coupling/index.md"
}