{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "pololu-37d-metal-gearmotor",
 "name": "Pololu 37D metal gearmotor (100:1, #4745): Ø36.8 body, 6 mm shaft and M3 face-mount holes",
 "kind": "modern",
 "category": "Electronic components",
 "group": "Motors",
 "year": null,
 "question": "What are the Pololu 37D metal gearmotor dimensions, shaft and mounting holes?",
 "tags": [
  "pololu 37d",
  "37d gearmotor",
  "37 mm gearmotor",
  "rover motor",
  "robot drivetrain motor",
  "m3 face mount motor"
 ],
 "aliases": [
  "Pololu 37D metal gearmotor",
  "pololu 37d",
  "Pololu 4745",
  "100:1 Metal Gearmotor 37Dx57L mm 12V",
  "pololu 37d metal gearmotor dimensions",
  "pololu 37d mounting holes",
  "rover wheel motor"
 ],
 "overall_mm": {
  "length": 79,
  "width": 36.8,
  "height": 36.8
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/pololu-37d-metal-gearmotor/",
 "sheet_txt": "https://xemstudio.com/objects/pololu-37d-metal-gearmotor/sheet.txt",
 "sheet": {
  "basis": "Pololu product page #4745 and the Pololu 37D metal gearmotor dimension diagram.",
  "overall_mm": {
   "length": 79,
   "width": 36.8,
   "height": 36.8
  },
  "notes": [
   "Datum: motor axis on Z, centred on X and Y; back of the motor can on z=0, gearbox face plate at z=57.0.",
   "Body Ø36.8 × 57.0 (100:1, no encoder); central boss Ø12.0 × 6.0; output shaft Ø6.0 D-shaft × 16.0, ending at z=79.0.",
   "Six M3 tapped holes in the face plate, 3.0 mm max screw engagement, on a Ø31.0 bolt circle (hexagon, 15.5 between neighbours), first hole on +X.",
   "Gearbox length varies with ratio: 21.5 (19:1, 30:1), 24.0 (50:1, 70:1), 26.5 (100:1, 131:1, 150:1); encoder versions add a rear encoder.",
   "Modelled: body as one Ø36.8 cylinder, boss, shaft (flat not modelled), face holes. Not modelled: rear terminals.",
   "Exact nominal mm."
  ],
  "table": {
   "columns": [
    "hole",
    "x (mm)",
    "y (mm)",
    "thread"
   ],
   "rows": [
    [
     "1",
     15.5,
     0,
     "M3"
    ],
    [
     "2",
     7.75,
     13.42,
     "M3"
    ],
    [
     "3",
     -7.75,
     13.42,
     "M3"
    ],
    [
     "4",
     -15.5,
     0,
     "M3"
    ],
    [
     "5",
     -7.75,
     -13.42,
     "M3"
    ],
    [
     "6",
     7.75,
     -13.42,
     "M3"
    ]
   ]
  }
 },
 "sheet_text": "Pololu 37D metal gearmotor (100:1, #4745): Ø36.8 body, 6 mm shaft and M3 face-mount holes — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/pololu-37d-metal-gearmotor/  (sheet CC BY 4.0)\nBasis: Pololu product page #4745 and the Pololu 37D metal gearmotor dimension diagram.\nCatalog version: 2026-10-20\n\nOverall (mm): length 79.0, width 36.8, height 36.8\n- Datum: motor axis on Z, centred on X and Y; back of the motor can on z=0, gearbox face plate at z=57.0.\n- Body Ø36.8 × 57.0 (100:1, no encoder); central boss Ø12.0 × 6.0; output shaft Ø6.0 D-shaft × 16.0, ending at z=79.0.\n- Six M3 tapped holes in the face plate, 3.0 mm max screw engagement, on a Ø31.0 bolt circle (hexagon, 15.5 between neighbours), first hole on +X.\n- Gearbox length varies with ratio: 21.5 (19:1, 30:1), 24.0 (50:1, 70:1), 26.5 (100:1, 131:1, 150:1); encoder versions add a rear encoder.\n- Modelled: body as one Ø36.8 cylinder, boss, shaft (flat not modelled), face holes. Not modelled: rear terminals.\n- Exact nominal mm.\n\nhole  x (mm)  y (mm)  thread\n1  15.5  0  M3\n2  7.75  13.42  M3\n3  -7.75  13.42  M3\n4  -15.5  0  M3\n5  -7.75  -13.42  M3\n6  7.75  -13.42  M3\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Pololu: 100:1 Metal Gearmotor 37Dx57L mm 12V (#4745) — web — Publisher's page; dimensions are facts — https://www.pololu.com/product/4745\n- Pololu: Dimensions of the 37D metal gearmotors (PDF) — web — Publisher's page; dimensions are facts — https://www.pololu.com/file/0J1704/37d-metal-gearmotors-dimension-diagram.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/pololu-37d-metal-gearmotor/index.json\nAPI: https://xemstudio.com/api/geometry?object=pololu-37d-metal-gearmotor\n",
 "sources": [
  {
   "publisher": "Pololu",
   "title": "100:1 Metal Gearmotor 37Dx57L mm 12V (#4745)",
   "url": "https://www.pololu.com/product/4745",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Pololu",
   "title": "Dimensions of the 37D metal gearmotors (PDF)",
   "url": "https://www.pololu.com/file/0J1704/37d-metal-gearmotors-dimension-diagram.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "jga25-370-gearmotor",
  "775-dc-motor",
  "shaft-couplers",
  "metric-shafts",
  "socket-head-cap-screws-metric"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. 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. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [
  {
   "feature": "Face-plate holes",
   "exact": "6 × M3 on Ø31.0, 3.0 deep max",
   "mates": "M3 screws through an L-bracket",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "Output shaft",
   "exact": "Ø6.0 D-shaft, 16.0 long",
   "mates": "6 mm wheel hub or coupler",
   "fit": "slide",
   "files": "all"
  },
  {
   "feature": "Gearbox body",
   "exact": "Ø36.8",
   "mates": "clamp-style motor mount",
   "fit": "clamp",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.",
  "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. ISO 286 equivalent: H7/g6 or H7/h6.",
  "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.",
  "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 Pololu 37D mounting-hole pattern?",
   "a": "Six M3 tapped holes on a Ø31.0 mm bolt circle in the gearbox face, max 3.0 mm screw engagement."
  },
  {
   "q": "What shaft does the 37D have?",
   "a": "Ø6.0 mm D-shaft, 16.0 mm long, from a Ø12.0 × 6.0 mm boss."
  },
  {
   "q": "How long is the 37D gearmotor?",
   "a": "For 100:1: 57.0 mm body plus 22.0 mm boss and shaft, 79.0 mm overall; shorter ratios have shorter gearboxes."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "pololu-37d-metal-gearmotor",
   "formats": [
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   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/pololu-37d-metal-gearmotor/pololu-37d-metal-gearmotor.step",
   "stl": "https://xemstudio.com/files/hardware/pololu-37d-metal-gearmotor/pololu-37d-metal-gearmotor.stl",
   "note": "Pololu 37D metal gearmotor (100:1, #4745): Ø36.8 body, 6 mm shaft and M3 face-mount holes"
  }
 ],
 "markdown": "https://xemstudio.com/objects/pololu-37d-metal-gearmotor/index.md"
}