{
 "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": "dc-motors-775-n20-tt",
 "name": "DC motors: 775, N20 gearmotor, TT gearmotor",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What are the 775 motor dimensions and mounting holes?",
 "tags": [
  "motor",
  "dc motor",
  "gearmotor",
  "robot"
 ],
 "aliases": [
  "775 motor",
  "n20 motor",
  "tt motor",
  "yellow motor",
  "micro gearmotor"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 3,
 "url": "https://xemstudio.com/objects/dc-motors-775-n20-tt/",
 "sheet_txt": "https://xemstudio.com/objects/dc-motors-775-n20-tt/sheet.txt",
 "sheet": {
  "basis": "Common supplier drawings for the 775 brushed motor, N20 micro gearmotor and the yellow TT gearmotor; values typical, verify on your unit",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "775: Ø42 mm can, 66.7 mm long, two M4 mounting holes on 29 mm centres in the face, Ø17.5 × 2 mm boss, Ø5 mm shaft 17 mm long.",
   "N20: 12 × 10 mm section, 15 mm motor + gearbox 9–12 mm depending on ratio; Ø3 mm D-shaft 9–10 mm long; two M1.6 face holes 9 mm apart.",
   "TT (yellow, 1:48): 70 × 22.5 × 18.5 mm overall with the motor, 5.5 mm double-D shaft both sides, two Ø3.2 mounting holes 17.6 mm apart on the gearbox; many clones vary by ±0.5 mm."
  ],
  "table": {
   "columns": [
    "motor",
    "section_mm",
    "length_mm",
    "shaft",
    "mounting"
   ],
   "rows": [
    [
     "775",
     "Ø42",
     66.7,
     "Ø5 × 17",
     "2 × M4 @ 29 mm"
    ],
    [
     "N20",
     "12 × 10",
     "24–27 with gearbox",
     "Ø3 D × 10",
     "2 × M1.6 @ 9 mm"
    ],
    [
     "TT",
     "22.5 × 18.5",
     70,
     "5.5 double-D",
     "2 × Ø3.2 @ 17.6 mm (gearbox)"
    ]
   ]
  }
 },
 "sheet_text": "DC motors: 775, N20 gearmotor, TT gearmotor — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/dc-motors-775-n20-tt/  (CC BY 4.0)\nBasis: Common supplier drawings for the 775 brushed motor, N20 micro gearmotor and the yellow TT gearmotor; values typical, verify on your unit\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 775: Ø42 mm can, 66.7 mm long, two M4 mounting holes on 29 mm centres in the face, Ø17.5 × 2 mm boss, Ø5 mm shaft 17 mm long.\n- N20: 12 × 10 mm section, 15 mm motor + gearbox 9–12 mm depending on ratio; Ø3 mm D-shaft 9–10 mm long; two M1.6 face holes 9 mm apart.\n- TT (yellow, 1:48): 70 × 22.5 × 18.5 mm overall with the motor, 5.5 mm double-D shaft both sides, two Ø3.2 mounting holes 17.6 mm apart on the gearbox; many clones vary by ±0.5 mm.\n\nmotor  section_mm  length_mm  shaft  mounting\n775  Ø42  66.7  Ø5 × 17  2 × M4 @ 29 mm\nN20  12 × 10  24–27 with gearbox  Ø3 D × 10  2 × M1.6 @ 9 mm\nTT  22.5 × 18.5  70  5.5 double-D  2 × Ø3.2 @ 17.6 mm (gearbox)\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, 3 parts): https://xemstudio.com/files/hardware/dc-motors-775-n20-tt/index.json\nAPI: https://xemstudio.com/api/geometry?object=dc-motors-775-n20-tt\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": [
  "nema-17-stepper",
  "shaft-couplers",
  "18650-cell",
  "socket-head-cap-screws-metric"
 ],
 "faq": [
  {
   "q": "What are 775 motor dimensions?",
   "a": "Ø42 mm × 66.7 mm body, Ø5 mm shaft 17 mm long, two M4 holes 29 mm apart. Runs 12–24 V; needs a Ø42.3 mm printed cradle or the face holes."
  },
  {
   "q": "What is the N20 motor shaft size?",
   "a": "3 mm D-shaft, about 9–10 mm long; Pololu-style brackets clamp the 12 × 10 mm body."
  },
  {
   "q": "What are TT motor mounting dimensions?",
   "a": "Two Ø3.2 holes 17.6 mm apart on the gearbox side; body 70 × 22.5 × 18.5 mm; 5.5 mm double-D shaft for the standard 65 mm yellow wheels."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "motor-775",
   "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-775.step",
   "stl": "https://xemstudio.com/files/hardware/dc-motors-775-n20-tt/motor-775.stl",
   "note": "775 brushed DC: Ø42 × 66.7, 2 × M4 on 29 mm, Ø5 shaft × 17"
  },
  {
   "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 × 10"
  },
  {
   "file": "motor-tt-dual-shaft",
   "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-tt-dual-shaft.step",
   "stl": "https://xemstudio.com/files/hardware/dc-motors-775-n20-tt/motor-tt-dual-shaft.stl",
   "note": "TT yellow gearmotor envelope: 70 × 22.5 × 18.5, 5.5 mm double-D shafts"
  }
 ],
 "markdown": "https://xemstudio.com/objects/dc-motors-775-n20-tt/index.md"
}