{
 "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-motor-380-size",
 "name": "380 / 385 size brushed DC motor: Ø27.7 × 37.8 mm, 2 × M2.6 on 16",
 "kind": "hardware",
 "category": "Electronics",
 "group": "Motors",
 "year": null,
 "question": "What are the dimensions of a 380 size DC motor?",
 "tags": [
  "380",
  "385",
  "dc motor",
  "brushed motor",
  "rs-380",
  "rs-385",
  "motor",
  "motor envelope",
  "stirling"
 ],
 "aliases": [
  "380 motor dimensions",
  "385 motor dimensions",
  "rs-380 size",
  "rs-385 size",
  "380 motor mounting holes",
  "385 motor hole spacing",
  "380 motor step",
  "385 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/dc-motor-380-size/",
 "sheet_txt": "https://xemstudio.com/objects/dc-motor-380-size/sheet.txt",
 "sheet": {
  "basis": "Mabuchi RS-380PH and RS-385SH dimension drawings (identical outside sizes); outside size also on the MonotaRO RS-380PH listing, hole spacing on the MakerBazar RS-385 listing. Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn.",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn.",
   "The 380 and 385 share one envelope: a Ø27.7 × 37.8 can with a Ø10.0 × 2.6 boss on each end.",
   "The Ø2.3 shaft runs 16.4 mm out from the front face. The drawing's 57.0 overall is 0.2 longer than the drawn parts.",
   "Two M2.6 × 0.45 tapped holes on 16.0 mm centres, drawn at the major diameter 3.0 deep (the usable screw length on the drawing).",
   "Vent holes, terminal tabs and the wire exit are not drawn. The drawing's Ø29.2 maximum is over the end-cap terminals.",
   "In DIY Stirling builds, brushed DC motors of this kind are turned by the engine and used as a generator (an LED, a resistor or a meter across the leads) or as a load on the flywheel shaft."
  ],
  "table": {
   "columns": [
    "feature",
    "mm",
    "from"
   ],
   "rows": [
    [
     "can",
     "Ø27.7 × 37.8",
     "Mabuchi RS-380PH / RS-385SH, MonotaRO"
    ],
    [
     "front and rear boss",
     "Ø10.0 × 2.6",
     "Mabuchi drawings"
    ],
    [
     "shaft",
     "Ø2.3",
     "Mabuchi drawings"
    ],
    [
     "shaft from the face",
     "16.4",
     "Mabuchi drawings"
    ],
    [
     "face holes",
     "2 × M2.6 × 0.45 on 16.0",
     "Mabuchi drawings, MakerBazar"
    ],
    [
     "usable screw length",
     "3.0",
     "Mabuchi drawings"
    ],
    [
     "largest Ø (terminals)",
     "29.2",
     "Mabuchi drawings"
    ]
   ]
  }
 },
 "sheet_text": "380 / 385 size brushed DC motor: Ø27.7 × 37.8 mm, 2 × M2.6 on 16 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/dc-motor-380-size/  (CC BY 4.0)\nBasis: Mabuchi RS-380PH and RS-385SH dimension drawings (identical outside sizes); outside size also on the MonotaRO RS-380PH listing, hole spacing on the MakerBazar RS-385 listing. Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn.\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn.\n- The 380 and 385 share one envelope: a Ø27.7 × 37.8 can with a Ø10.0 × 2.6 boss on each end.\n- The Ø2.3 shaft runs 16.4 mm out from the front face. The drawing's 57.0 overall is 0.2 longer than the drawn parts.\n- Two M2.6 × 0.45 tapped holes on 16.0 mm centres, drawn at the major diameter 3.0 deep (the usable screw length on the drawing).\n- Vent holes, terminal tabs and the wire exit are not drawn. The drawing's Ø29.2 maximum is over the end-cap terminals.\n- In DIY Stirling builds, brushed DC motors of this kind are turned by the engine and used as a generator (an LED, a resistor or a meter across the leads) or as a load on the flywheel shaft.\n\nfeature  mm  from\ncan  Ø27.7 × 37.8  Mabuchi RS-380PH / RS-385SH, MonotaRO\nfront and rear boss  Ø10.0 × 2.6  Mabuchi drawings\nshaft  Ø2.3  Mabuchi drawings\nshaft from the face  16.4  Mabuchi drawings\nface holes  2 × M2.6 × 0.45 on 16.0  Mabuchi drawings, MakerBazar\nusable screw length  3.0  Mabuchi drawings\nlargest Ø (terminals)  29.2  Mabuchi drawings\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Mabuchi Motor (hosted by electro-tech-online): RS-380PH datasheet and dimension drawing — PDF — manufacturer datasheet [verify license at link] — https://www.electro-tech-online.com/custompdfs/2011/01/rs_380ph.pdf\n- Mabuchi Motor (compiled catalogue, hosted by mikrocontroller.net): Carbon-brush and metal-brush motor datasheets incl. RS-360RH, RS-365SH, RS-385SH, RS-550PC, RS-555VC, RS-775VC dimension drawings — PDF — manufacturer datasheets [verify license at link] — https://mikrocontroller.net/attachment/641472/Mabuchi_Motors_Complete.pdf\n- MonotaRO: RS-380PH listing: outside 37.8 × 27.7, shaft Ø2.3, tapped mounting — web — listing [verify license at link] — https://www.monotaro.com/p/0526/3983/\n- MakerBazar: RS-385 listing: two M2.6 × 0.45 tapped holes on 16 mm centres — web — listing [verify license at link] — https://makerbazar.in/products/rs-385-dc-motor-6v-12v\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/dc-motor-380-size/index.json\nAPI: https://xemstudio.com/api/geometry?object=dc-motor-380-size\n",
 "sources": [
  {
   "publisher": "Mabuchi Motor (hosted by electro-tech-online)",
   "title": "RS-380PH datasheet and dimension drawing",
   "url": "https://www.electro-tech-online.com/custompdfs/2011/01/rs_380ph.pdf",
   "formats": [
    "PDF"
   ],
   "license": "manufacturer datasheet",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Mabuchi Motor (compiled catalogue, hosted by mikrocontroller.net)",
   "title": "Carbon-brush and metal-brush motor datasheets incl. RS-360RH, RS-365SH, RS-385SH, RS-550PC, RS-555VC, RS-775VC dimension drawings",
   "url": "https://mikrocontroller.net/attachment/641472/Mabuchi_Motors_Complete.pdf",
   "formats": [
    "PDF"
   ],
   "license": "manufacturer datasheets",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "MonotaRO",
   "title": "RS-380PH listing: outside 37.8 × 27.7, shaft Ø2.3, tapped mounting",
   "url": "https://www.monotaro.com/p/0526/3983/",
   "formats": [
    "web"
   ],
   "license": "listing",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "MakerBazar",
   "title": "RS-385 listing: two M2.6 × 0.45 tapped holes on 16 mm centres",
   "url": "https://makerbazar.in/products/rs-385-dc-motor-6v-12v",
   "formats": [
    "web"
   ],
   "license": "listing",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "dc-motor-365-size",
  "dc-motor-390-size",
  "dc-motor-540-size",
  "dc-motor-370-size",
  "socket-head-cap-screws-metric"
 ],
 "fits": [
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "dc-motor-365-size",
     "why": "same face, 32.6 can"
    },
    {
     "slug": "dc-motor-390-size",
     "why": "same 16 mm hole spacing, longer can"
    },
    {
     "slug": "dc-motor-540-size",
     "why": "bigger Ø35.8 can, Ø3.17 shaft"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "leds-tht",
     "why": "an LED across the leads shows generator output"
    }
   ]
  }
 ],
 "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": "shaft",
   "exact": "Ø2.3",
   "mates": "pinion or pulley bore (pressed on)",
   "fit": "press",
   "files": "dc-380-"
  },
  {
   "feature": "front boss",
   "exact": "Ø10.0 × 2.6",
   "mates": "mount recess",
   "fit": "socket",
   "files": "dc-380-"
  },
  {
   "feature": "mounting holes",
   "exact": "2 × M2.6 × 0.45 on 16.0, 3.0 usable depth",
   "mates": "M2.6 screws through the mount",
   "fit": "designed",
   "files": "dc-380-"
  },
  {
   "feature": "can",
   "exact": "Ø27.7",
   "mates": "cradle",
   "fit": "socket",
   "files": "dc-380-"
  }
 ],
 "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 380 motor dimensions?",
   "a": "Ø27.7 × 37.8 mm can, Ø2.3 shaft 16.4 mm from the face, Ø10.0 × 2.6 bosses, two M2.6 holes 16.0 apart."
  },
  {
   "q": "What is the 385 motor mounting hole spacing?",
   "a": "16.0 mm, two M2.6 × 0.45 tapped holes; screws no deeper than 3.0 mm into the motor. Same as the 380."
  },
  {
   "q": "380 vs 385?",
   "a": "The same outside: can, face, holes and shaft. They differ inside (windings, brushes)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "dc-380-385-size",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/dc-motor-380-size/dc-380-385-size.step",
   "stl": "https://xemstudio.com/files/hardware/dc-motor-380-size/dc-380-385-size.stl",
   "note": "380 / 385 size envelope: Ø27.7 × 37.8 can, Ø10.0 × 2.6 bosses front and rear, Ø2.3 shaft 16.4 from the face, 2 × M2.6 on 16.0 drawn Ø2.6 × 3.0"
  }
 ],
 "markdown": "https://xemstudio.com/objects/dc-motor-380-size/index.md"
}