{
 "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": "tt-gearmotor",
 "name": "TT yellow gearmotor 70 × 22.5 × 18.5 mm, Ø5.5 double-D shafts",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What are TT motor mounting dimensions?",
 "tags": [
  "tt motor",
  "gearmotor",
  "yellow motor",
  "motor",
  "robot"
 ],
 "aliases": [
  "tt motor",
  "yellow motor dimensions",
  "tt gear motor stl",
  "tt motor shaft size",
  "tt motor mounting holes"
 ],
 "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/tt-gearmotor/",
 "sheet_txt": "https://xemstudio.com/objects/tt-gearmotor/sheet.txt",
 "sheet": {
  "basis": "Common supplier drawings for the yellow TT (1:48) gearmotor; clones vary by about ±0.5 mm",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The TT envelope is a 37 × 22.5 × 18.5 mm gearbox plus a Ø18.5 × 33 motor: 70 × 22.5 × 18.5 overall.",
   "The output is a Ø5.5 double-D shaft, 3.7 mm across the flats, sticking out 9.5 mm on both sides (41.5 across).",
   "Two Ø3.2 holes run through the gearbox's 22.5 mm width, 17.6 mm apart along its length and 17.5 mm apart in height.",
   "Many clones vary by about ±0.5 mm."
  ],
  "table": {
   "columns": [
    "feature",
    "size_mm"
   ],
   "rows": [
    [
     "overall",
     "70 × 22.5 × 18.5"
    ],
    [
     "gearbox",
     "37 × 22.5 × 18.5"
    ],
    [
     "shaft",
     "Ø5.5 double-D, 3.7 across flats"
    ],
    [
     "shaft span",
     41.5
    ],
    [
     "holes",
     "2 × Ø3.2"
    ]
   ]
  }
 },
 "sheet_text": "TT yellow gearmotor 70 × 22.5 × 18.5 mm, Ø5.5 double-D shafts — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tt-gearmotor/  (CC BY 4.0)\nBasis: Common supplier drawings for the yellow TT (1:48) gearmotor; clones vary by about ±0.5 mm\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The TT envelope is a 37 × 22.5 × 18.5 mm gearbox plus a Ø18.5 × 33 motor: 70 × 22.5 × 18.5 overall.\n- The output is a Ø5.5 double-D shaft, 3.7 mm across the flats, sticking out 9.5 mm on both sides (41.5 across).\n- Two Ø3.2 holes run through the gearbox's 22.5 mm width, 17.6 mm apart along its length and 17.5 mm apart in height.\n- Many clones vary by about ±0.5 mm.\n\nfeature  size_mm\noverall  70 × 22.5 × 18.5\ngearbox  37 × 22.5 × 18.5\nshaft  Ø5.5 double-D, 3.7 across flats\nshaft span  41.5\nholes  2 × Ø3.2\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/tt-gearmotor/index.json\nAPI: https://xemstudio.com/api/geometry?object=tt-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": [
  "n20-gearmotor",
  "775-dc-motor",
  "18650-cell"
 ],
 "fits": [
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "18650-cell",
     "why": "a common supply for TT robot chassis"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "n20-gearmotor",
     "why": "smaller metal-gear 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": "TT shaft",
   "exact": "Ø5.5 double-D, 3.7 across the flats",
   "mates": "wheel hub",
   "fit": "press",
   "files": "motor-tt-"
  },
  {
   "feature": "mounting holes",
   "exact": "Ø3.2 × 2, 17.6 apart",
   "mates": "M3 screws through the gearbox",
   "fit": "designed",
   "files": "motor-tt-"
  }
 ],
 "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 are TT motor dimensions?",
   "a": "70 × 22.5 × 18.5 mm overall with a Ø5.5 double-D shaft (3.7 across the flats) on both sides."
  },
  {
   "q": "What wheel fits a TT motor?",
   "a": "Any hub with the Ø5.5 double-D, 3.7 mm across the flats; the standard yellow wheels are 65 mm."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "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 gearmotor envelope: 70 long (37 gearbox + 33 motor), 22.5 tall × 18.8 thick, Ø5.5 double-D output shaft (3.7 across the flats) 37 tip to tip, 25.8 from the motor end of the gearbox; two Ø3.2 mounting holes through the 18.8 thickness, 5 from the motor end, 17.6 apart one above the other (0.85 mm of wall to the top and bottom faces)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tt-gearmotor/index.md"
}