{
 "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": "threaded-standoffs-metric",
 "name": "Threaded standoffs, M2.5 and M3 (hex and round)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the dimensions of M3 and M2.5 hex standoffs for mounting a PCB?",
 "tags": [
  "standoff",
  "spacer",
  "fastener",
  "pcb"
 ],
 "aliases": [
  "m3 standoff",
  "m2.5 standoff",
  "hex standoff",
  "pcb spacer"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 16,
 "url": "https://xemstudio.com/objects/threaded-standoffs-metric/",
 "sheet_txt": "https://xemstudio.com/objects/threaded-standoffs-metric/sheet.txt",
 "sheet": {
  "basis": "common vendor dimensions",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "M2.5 (Raspberry Pi) standoffs: 5 mm across flats; M3: 5.5 mm across flats. Lengths 3–40 mm in 1–5 mm steps; male-female adds a 6 mm stud.",
   "Pocket for a hex standoff in a print: AF + 0.2 mm."
  ],
  "table": {
   "columns": [
    "thread",
    "width_af_mm",
    "corner_mm",
    "common_lengths_mm"
   ],
   "rows": [
    [
     "M2.5",
     5,
     5.8,
     "3, 5, 6, 8, 10, 12, 15, 20"
    ],
    [
     "M3",
     5.5,
     6.4,
     "5, 6, 8, 10, 12, 15, 20, 25, 30"
    ]
   ]
  }
 },
 "sheet_text": "Threaded standoffs, M2.5 and M3 (hex and round) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/threaded-standoffs-metric/  (CC BY 4.0)\nBasis: common vendor dimensions\nCatalog version: 2026-10-20\n\nSizes: see table below\n- M2.5 (Raspberry Pi) standoffs: 5 mm across flats; M3: 5.5 mm across flats. Lengths 3–40 mm in 1–5 mm steps; male-female adds a 6 mm stud.\n- Pocket for a hex standoff in a print: AF + 0.2 mm.\n\nthread  width_af_mm  corner_mm  common_lengths_mm\nM2.5  5  5.8  3, 5, 6, 8, 10, 12, 15, 20\nM3  5.5  6.4  5, 6, 8, 10, 12, 15, 20, 25, 30\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- McMaster-Carr: Standoffs (free STEP/IGES/STL per part, for your own design use; no redistribution) — STEP, IGES, STL, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/standoffs/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 16 parts): https://xemstudio.com/files/hardware/threaded-standoffs-metric/index.json\nAPI: https://xemstudio.com/api/geometry?object=threaded-standoffs-metric\n",
 "sources": [
  {
   "publisher": "McMaster-Carr",
   "title": "Standoffs (free STEP/IGES/STL per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/standoffs/",
   "formats": [
    "STEP",
    "IGES",
    "STL",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
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  "sheet_free": true,
  "mesh_price_usd": null,
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  "tolerance_mm": null
 },
 "related": [
  "raspberry-pi-5",
  "raspberry-pi-4-b",
  "socket-head-cap-screws-metric",
  "hex-nuts-metric"
 ],
 "faq": [
  {
   "q": "What size standoff does a Raspberry Pi use?",
   "a": "M2.5, 5 mm across flats. The Pi 4, Pi 5, Zero 2 W and Pico all mount on M2.5; common heights are 5, 6, 10 and 12 mm."
  },
  {
   "q": "What is the across-flats size of an M3 hex standoff?",
   "a": "5.5 mm across flats, 6.4 mm across corners. Pocket in a print: 5.7 mm across flats."
  }
 ],
 "files_license": null,
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}