{
 "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-hub-40",
 "name": "Oldham coupling hub Ø40, 5 mm bore",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is an Oldham coupling hub?",
 "tags": [
  "mechanism part",
  "linkage"
 ],
 "aliases": [
  "oldham hub"
 ],
 "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-hub-40/",
 "sheet_txt": "https://xemstudio.com/objects/oldham-coupling-hub-40/sheet.txt",
 "sheet": {
  "basis": "Xem Studio drawing",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Ø40 hub with an 8 mm tongue across its face and a Ø5 bore; two hubs and a centre disc make an Oldham coupling."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "diameter",
     "40 mm"
    ],
    [
     "tongue",
     "8 × 4 mm"
    ],
    [
     "bore",
     "Ø5"
    ]
   ]
  }
 },
 "sheet_text": "Oldham coupling hub Ø40, 5 mm bore — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/oldham-coupling-hub-40/  (CC BY 4.0)\nBasis: Xem Studio drawing\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Ø40 hub with an 8 mm tongue across its face and a Ø5 bore; two hubs and a centre disc make an Oldham coupling.\n\ndimension  value\ndiameter  40 mm\ntongue  8 × 4 mm\nbore  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/objects/oldham-coupling/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/oldham-coupling-hub-40/index.json\nAPI: https://xemstudio.com/api/geometry?object=oldham-coupling-hub-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 an Oldham coupling hub?",
   "a": "Ø40 hub with an 8 mm tongue across its face and a Ø5 bore; two hubs and a centre disc make an Oldham coupling."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "oldham-hub-40",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/oldham-coupling-hub-40/oldham-hub-40.step",
   "stl": "https://xemstudio.com/files/hardware/oldham-coupling-hub-40/oldham-hub-40.stl",
   "note": "Hub, 5 mm bore"
  }
 ],
 "markdown": "https://xemstudio.com/objects/oldham-coupling-hub-40/index.md"
}