{
 "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-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft",
 "name": "Pololu 30:1 Micro Metal Gearmotor HPCB 6V, extended motor shaft (#3072): body, D-shaft and M1.6 face holes",
 "kind": "modern",
 "category": "Electronic components",
 "group": "Motors",
 "year": null,
 "question": "What are the Pololu 30:1 Micro Metal Gearmotor (#3072) dimensions, shaft and mounting holes?",
 "tags": [
  "pololu micro metal gearmotor",
  "micro metal gearmotor dimensions",
  "pololu 3072",
  "n20 size gearmotor",
  "micro gearmotor bracket",
  "3 mm d-shaft"
 ],
 "aliases": [
  "Pololu 3072",
  "Pololu #3072",
  "30:1 Micro Metal Gearmotor HPCB 6V",
  "pololu micro metal gearmotor hp",
  "pololu 100:1 micro metal gearmotor hp 6v",
  "Pololu micro metal gearmotor extended motor shaft",
  "Pololu micro gearmotor mounting holes",
  "MP / HP / HPCB micro metal gearmotor"
 ],
 "overall_mm": {
  "length": 40.3,
  "width": 12,
  "height": 10
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/",
 "sheet_txt": "https://xemstudio.com/objects/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/sheet.txt",
 "sheet": {
  "basis": "Pololu's micro metal gearmotor 3D STEP models (extended-shaft carbon-brush version), checked against the Pololu #3072 product page and the micro metal gearmotor dimension diagram.",
  "overall_mm": {
   "length": 40.3,
   "width": 12,
   "height": 10
  },
  "notes": [
   "Axis along the length; 0 is the tip of the extended rear motor shaft. Cross-section 12.0 × 10.0 (Ø12 can with two flats).",
   "Motor can and back cap 15.4 long, gearbox 9.0 long; the gearbox output face is 30.3 from the rear shaft tip.",
   "Output: Ø3.0 D-shaft (0.5 deep flat) reaching 10.0 past the gearbox face, with a Ø4.0 bushing 0.72 proud of the face.",
   "Two M1.6 threaded holes in the gearbox output face, diagonal pair at (±3.80, ±2.80) from the shaft axis.",
   "Rear: Ø1.0 extended motor shaft, about 4.5 past the motor for an encoder; HPCB terminals 6.3 apart. The same body applies to every HPCB/HP/MP ratio except 1000:1.",
   "All dimensions are exact nominal millimetres, true size, with no tolerance added."
  ]
 },
 "sheet_text": "Pololu 30:1 Micro Metal Gearmotor HPCB 6V, extended motor shaft (#3072): body, D-shaft and M1.6 face holes — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/  (sheet CC BY 4.0)\nBasis: Pololu's micro metal gearmotor 3D STEP models (extended-shaft carbon-brush version), checked against the Pololu #3072 product page and the micro metal gearmotor dimension diagram.\nCatalog version: 2026-10-20\n\nOverall (mm): length 40.3, width 12.0, height 10.0\n- Axis along the length; 0 is the tip of the extended rear motor shaft. Cross-section 12.0 × 10.0 (Ø12 can with two flats).\n- Motor can and back cap 15.4 long, gearbox 9.0 long; the gearbox output face is 30.3 from the rear shaft tip.\n- Output: Ø3.0 D-shaft (0.5 deep flat) reaching 10.0 past the gearbox face, with a Ø4.0 bushing 0.72 proud of the face.\n- Two M1.6 threaded holes in the gearbox output face, diagonal pair at (±3.80, ±2.80) from the shaft axis.\n- Rear: Ø1.0 extended motor shaft, about 4.5 past the motor for an encoder; HPCB terminals 6.3 apart. The same body applies to every HPCB/HP/MP ratio except 1000:1.\n- All dimensions are exact nominal millimetres, true size, with no tolerance added.\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Pololu: 30:1 Micro Metal Gearmotor HPCB 6V with Extended Motor Shaft (#3072) — web — Publisher's page; dimensions are facts — https://www.pololu.com/product/3072\n- Pololu: Micro metal gearmotor dimension diagram (PDF) — web — Publisher's page; dimensions are facts — https://www.pololu.com/file/0J949/micro-metal-gearmotors-dimensions.pdf\n- Pololu: Micro metal gearmotor 3D STEP models — web — Publisher's page; dimensions are facts — https://www.pololu.com/file/0J2042/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/index.json\nAPI: https://xemstudio.com/api/geometry?object=pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft\n",
 "sources": [
  {
   "publisher": "Pololu",
   "title": "30:1 Micro Metal Gearmotor HPCB 6V with Extended Motor Shaft (#3072)",
   "url": "https://www.pololu.com/product/3072",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Pololu",
   "title": "Micro metal gearmotor dimension diagram (PDF)",
   "url": "https://www.pololu.com/file/0J949/micro-metal-gearmotors-dimensions.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Pololu",
   "title": "Micro metal gearmotor 3D STEP models",
   "url": "https://www.pololu.com/file/0J2042/",
   "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": [
  "775-dc-motor",
  "jga25-370-gearmotor",
  "dc-motor-130-size",
  "shaft-couplers",
  "pololu-a4988-stepper-driver-carrier"
 ],
 "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": "Output D-shaft",
   "exact": "Ø3.0 with 0.5 deep flat, 10.0 long from the gearbox face",
   "mates": "Pololu wheel or hub with a 3 mm D bore",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "Gearbox face holes",
   "exact": "2 × M1.6 on a (±3.80, ±2.80) diagonal",
   "mates": "face-mount bracket with M1.6 screws",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "Body cross-section",
   "exact": "12.0 × 10.0 (Ø12 can with flats)",
   "mates": "clamp-style micro gearmotor bracket",
   "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": "How big is a Pololu micro metal gearmotor?",
   "a": "12.0 × 10.0 mm in cross-section; #3072 with extended motor shaft is 40.3 mm from rear shaft tip to output shaft tip."
  },
  {
   "q": "What shaft does the Pololu #3072 have?",
   "a": "A Ø3.0 mm D-shaft with a 0.5 mm deep flat, reaching 10.0 mm past the gearbox face."
  },
  {
   "q": "Where are the micro metal gearmotor mounting holes?",
   "a": "Two M1.6 threaded holes in the gearbox output face, a diagonal pair at (±3.80, ±2.80) mm from the shaft axis."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft",
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    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft.step",
   "stl": "https://xemstudio.com/files/hardware/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft.stl",
   "note": "Pololu 30:1 Micro Metal Gearmotor HPCB 6V, extended motor shaft (#3072): body, D-shaft and M1.6 face holes"
  }
 ],
 "markdown": "https://xemstudio.com/objects/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/index.md"
}