{
 "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-disc-40",
 "name": "Oldham coupling centre disc Ø40",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is the Oldham centre disc?",
 "tags": [
  "mechanism part",
  "linkage"
 ],
 "aliases": [
  "oldham disc",
  "oldham coupling center"
 ],
 "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-disc-40/",
 "sheet_txt": "https://xemstudio.com/objects/oldham-coupling-disc-40/sheet.txt",
 "sheet": {
  "basis": "Xem Studio drawing",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Ø40 × 8 disc with two 8.2 mm slots at 90°, one per face: each hub's tongue slides in one slot."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "diameter",
     "40 mm"
    ],
    [
     "slots",
     "8.2 × 4 mm, crossed"
    ]
   ]
  }
 },
 "sheet_text": "Oldham coupling centre disc Ø40 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/oldham-coupling-disc-40/  (CC BY 4.0)\nBasis: Xem Studio drawing\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Ø40 × 8 disc with two 8.2 mm slots at 90°, one per face: each hub's tongue slides in one slot.\n\ndimension  value\ndiameter  40 mm\nslots  8.2 × 4 mm, crossed\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/objects/oldham-coupling/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/oldham-coupling-disc-40/index.json\nAPI: https://xemstudio.com/api/geometry?object=oldham-coupling-disc-40\n",
 "sources": [
  {
   "publisher": "Xem Studio",
   "title": "drawing",
   "url": "https://xemstudio.com/objects/oldham-coupling/",
   "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"
 ],
 "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": "What is the Oldham centre disc?",
   "a": "Ø40 × 8 disc with two 8.2 mm slots at 90°, one per face: each hub's tongue slides in one slot."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "oldham-disc-40",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/oldham-coupling-disc-40/oldham-disc-40.step",
   "stl": "https://xemstudio.com/files/hardware/oldham-coupling-disc-40/oldham-disc-40.stl",
   "note": "Centre disc"
  }
 ],
 "markdown": "https://xemstudio.com/objects/oldham-coupling-disc-40/index.md"
}