{
 "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": "dowel-pins-metric",
 "name": "Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What hole size does a 3 mm dowel pin need for a press fit versus a slip fit?",
 "tags": [
  "pin",
  "dowel",
  "alignment",
  "hinge",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "dowel pin",
  "m3 dowel",
  "3mm pin",
  "hinge pin",
  "iso 2338"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 23,
 "url": "https://xemstudio.com/objects/dowel-pins-metric/",
 "sheet_txt": "https://xemstudio.com/objects/dowel-pins-metric/sheet.txt",
 "sheet": {
  "basis": "ISO 2338 (h8) and DIN 6325 (m6) pin tolerances; fits per ISO 286",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Press fit in a print: pin diameter − 0.05 mm (and print slightly undersize holes, then ream). Slip fit for a hinge: pin + 0.15–0.2 mm.",
   "Common lengths 6–40 mm; 1.5 × diameter chamfer on each end."
  ],
  "table": {
   "columns": [
    "dia_mm",
    "press_fit_hole_mm",
    "slip_fit_hole_mm",
    "common_lengths_mm"
   ],
   "rows": [
    [
     2,
     1.95,
     2.2,
     "8, 10, 12, 16, 20"
    ],
    [
     3,
     2.95,
     3.2,
     "10, 12, 16, 20, 30"
    ],
    [
     4,
     3.95,
     4.2,
     "12, 16, 20, 30, 40"
    ],
    [
     5,
     4.95,
     5.2,
     "16, 20, 30, 40"
    ],
    [
     6,
     5.95,
     6.2,
     "20, 30, 40, 50"
    ]
   ]
  }
 },
 "sheet_text": "Dowel pins, 2–6 mm (ISO 2338 / DIN 6325) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/dowel-pins-metric/  (CC BY 4.0)\nBasis: ISO 2338 (h8) and DIN 6325 (m6) pin tolerances; fits per ISO 286\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Press fit in a print: pin diameter − 0.05 mm (and print slightly undersize holes, then ream). Slip fit for a hinge: pin + 0.15–0.2 mm.\n- Common lengths 6–40 mm; 1.5 × diameter chamfer on each end.\n\ndia_mm  press_fit_hole_mm  slip_fit_hole_mm  common_lengths_mm\n2  1.95  2.2  8, 10, 12, 16, 20\n3  2.95  3.2  10, 12, 16, 20, 30\n4  3.95  4.2  12, 16, 20, 30, 40\n5  4.95  5.2  16, 20, 30, 40\n6  5.95  6.2  20, 30, 40, 50\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- McMaster-Carr: Dowel pins (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/dowel-pins/\n- Wikipedia: Dowel — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Dowel\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 23 parts): https://xemstudio.com/files/hardware/dowel-pins-metric/index.json\nAPI: https://xemstudio.com/api/geometry?object=dowel-pins-metric\n",
 "sources": [
  {
   "publisher": "McMaster-Carr",
   "title": "Dowel pins (free STEP/IGES/STL per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/dowel-pins/",
   "formats": [
    "STEP",
    "IGES",
    "STL",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Dowel",
   "url": "https://en.wikipedia.org/wiki/Dowel",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
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  "tolerance_mm": null
 },
 "related": [
  "608-bearing",
  "neodymium-disc-magnets"
 ],
 "faq": [
  {
   "q": "What hole size for a 3 mm dowel pin press fit?",
   "a": "2.95 mm for a press fit, 3.2 mm for a slip fit (ISO 2338). In a print, model 2.9 mm and ream to 2.95."
  },
  {
   "q": "Can I use a 3 mm dowel pin as a hinge pin in a 3D print?",
   "a": "Yes: 3.2 mm hole in the moving part, 2.95 mm press fit in the fixed part. Lengths 10–30 mm are common; pins are hardened steel, chamfered 1.5 × d."
  }
 ],
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