{
 "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": "n20-gearmotor",
 "name": "N20 micro gearmotor 12 × 10 mm, Ø3 D-shaft",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What is the N20 motor size and shaft diameter?",
 "tags": [
  "n20",
  "gearmotor",
  "micro motor",
  "motor",
  "robot"
 ],
 "aliases": [
  "n20 motor",
  "n20 motor dimensions",
  "micro gearmotor size",
  "n20 shaft size",
  "n20 motor stl"
 ],
 "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/n20-gearmotor/",
 "sheet_txt": "https://xemstudio.com/objects/n20-gearmotor/sheet.txt",
 "sheet": {
  "basis": "Common supplier drawings for the N20 micro metal gearmotor; gearbox length varies by ratio",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The N20 is 12 × 10 mm in section: a 15 mm motor with R2 rounded edges plus a gearbox 9–12 mm long depending on ratio; the file has the 9 mm gearbox (24 mm body).",
   "The output is a Ø3 D-shaft, 2.5 mm across the flat, 10 mm long; 34 mm overall.",
   "The gearbox face has two M1.6 holes 9 mm apart, drawn as Ø1.6 × 4 deep."
  ],
  "table": {
   "columns": [
    "feature",
    "size_mm"
   ],
   "rows": [
    [
     "section",
     "12 × 10"
    ],
    [
     "motor",
     15
    ],
    [
     "gearbox (this file)",
     9
    ],
    [
     "shaft",
     "Ø3 D, 2.5 across flat × 10"
    ],
    [
     "face holes",
     "2 × M1.6 on 9"
    ]
   ]
  }
 },
 "sheet_text": "N20 micro gearmotor 12 × 10 mm, Ø3 D-shaft — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/n20-gearmotor/  (CC BY 4.0)\nBasis: Common supplier drawings for the N20 micro metal gearmotor; gearbox length varies by ratio\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The N20 is 12 × 10 mm in section: a 15 mm motor with R2 rounded edges plus a gearbox 9–12 mm long depending on ratio; the file has the 9 mm gearbox (24 mm body).\n- The output is a Ø3 D-shaft, 2.5 mm across the flat, 10 mm long; 34 mm overall.\n- The gearbox face has two M1.6 holes 9 mm apart, drawn as Ø1.6 × 4 deep.\n\nfeature  size_mm\nsection  12 × 10\nmotor  15\ngearbox (this file)  9\nshaft  Ø3 D, 2.5 across flat × 10\nface holes  2 × M1.6 on 9\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Pololu: Micro metal gearmotor dimension diagram — PDF, STEP — Pololu site terms [verify license at link] — https://www.pololu.com/category/60/micro-metal-gearmotors\n- DFRobot: TT geared motor drawing — web — DFRobot site terms [verify license at link] — https://www.dfrobot.com/product-100.html\n- Wikipedia: DC motor — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/DC_motor\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/n20-gearmotor/index.json\nAPI: https://xemstudio.com/api/geometry?object=n20-gearmotor\n",
 "sources": [
  {
   "publisher": "Pololu",
   "title": "Micro metal gearmotor dimension diagram",
   "url": "https://www.pololu.com/category/60/micro-metal-gearmotors",
   "formats": [
    "PDF",
    "STEP"
   ],
   "license": "Pololu site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "DFRobot",
   "title": "TT geared motor drawing",
   "url": "https://www.dfrobot.com/product-100.html",
   "formats": [
    "web"
   ],
   "license": "DFRobot site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "DC motor",
   "url": "https://en.wikipedia.org/wiki/DC_motor",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "775-dc-motor",
  "tt-gearmotor",
  "shaft-couplers"
 ],
 "fits": [
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "shaft-couplers",
     "why": "Ø3 D-shaft into a wheel or coupler hub (press)"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "tt-gearmotor",
     "why": "larger plastic-gearbox motor"
    }
   ]
  }
 ],
 "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": [
  {
   "feature": "N20 shaft",
   "exact": "Ø3 D (2.5 across the flat)",
   "mates": "wheel hub",
   "fit": "press",
   "files": "motor-n20-"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "What is the N20 motor shaft size?",
   "a": "3 mm D-shaft, 2.5 mm across the flat, about 10 mm long."
  },
  {
   "q": "How long is an N20 gearmotor?",
   "a": "15 mm motor plus a 9–12 mm gearbox; the file is 24 mm body, 34 mm with the shaft."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "motor-n20-9mm-gearbox",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/dc-motors-775-n20-tt/motor-n20-9mm-gearbox.step",
   "stl": "https://xemstudio.com/files/hardware/dc-motors-775-n20-tt/motor-n20-9mm-gearbox.stl",
   "note": "N20 micro gearmotor: 12 × 10 × 15 motor + 9 mm gearbox, Ø3 D-shaft (2.5 across the flat) × 10"
  }
 ],
 "markdown": "https://xemstudio.com/objects/n20-gearmotor/index.md"
}