{
 "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": "40mm-fan",
 "name": "40 mm axial fan",
 "kind": "standard",
 "category": "Power & cooling",
 "group": "Fans",
 "year": null,
 "question": "What are the mounting dimensions of a 40 mm fan?",
 "tags": [
  "fan",
  "cooling",
  "mount",
  "duct"
 ],
 "aliases": [
  "40mm fan",
  "4010",
  "4020"
 ],
 "overall_mm": {
  "length": 40,
  "width": 40,
  "height": 10
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/40mm-fan/",
 "sheet_txt": "https://xemstudio.com/objects/40mm-fan/sheet.txt",
 "sheet": {
  "basis": "industry standard frame",
  "overall_mm": {
   "length": 40,
   "width": 40,
   "height": 10
  },
  "notes": [
   "Frame 40 × 40 mm; four holes on a 32 × 32 mm pattern, Ø3.5 mm typical (M3 self-tapping or Ø4.3 for M4 on some).",
   "Thickness 10 mm (4010) or 20 mm (4020); check airflow direction arrows on the frame."
  ],
  "mounting_holes": {
   "count": 4,
   "diameter_mm": 3.5,
   "pattern_mm": "32 x 32",
   "screw": "M3"
  }
 },
 "sheet_text": "40 mm axial fan — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/40mm-fan/  (CC BY 4.0)\nBasis: industry standard frame\nCatalog version: 2026-10-20\n\nOverall (mm): length 40, width 40, height 10\nMounting holes: 4 × Ø3.5 mm, pattern 32 x 32, screw M3\n- Frame 40 × 40 mm; four holes on a 32 × 32 mm pattern, Ø3.5 mm typical (M3 self-tapping or Ø4.3 for M4 on some).\n- Thickness 10 mm (4010) or 20 mm (4020); check airflow direction arrows on the frame.\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Computer fan (dimensions table) — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Computer_fan\n\nXem Studio scan: not needed; this is a published standard. The sheet is the geometry.\nAPI: https://xemstudio.com/api/geometry?object=40mm-fan\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Computer fan (dimensions table)",
   "url": "https://en.wikipedia.org/wiki/Computer_fan",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "socket-head-cap-screws-metric",
  "raspberry-pi-5",
  "raspberry-pi-4-b",
  "120mm-fan"
 ],
 "faq": [
  {
   "q": "What is the 40 mm fan hole spacing?",
   "a": "32 × 32 mm, Ø3.5 mm holes (M3 self-tapping). Frame 40 × 40, 10 mm (4010) or 20 mm (4020) thick."
  },
  {
   "q": "What screws fit a 40 mm fan?",
   "a": "M3 × 16–20 for a 10 mm fan through a 3 mm plate, or #6-32 × 3/4 in self-tapping fan screws on 4.3 mm holes."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/40mm-fan/index.md"
}