{
 "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-540-size",
 "name": "540 size brushed DC motor: Ø35.8 × 50.0 mm, 2 × M3 on 25",
 "kind": "hardware",
 "category": "Electronics",
 "group": "Motors",
 "year": null,
 "question": "What are the dimensions of a 540 size DC motor?",
 "tags": [
  "540",
  "dc motor",
  "brushed motor",
  "rs-540",
  "motor",
  "motor envelope",
  "stirling"
 ],
 "aliases": [
  "540 motor dimensions",
  "540 motor mounting holes",
  "rs-540 size",
  "540 motor shaft size",
  "540 motor step",
  "540 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-540-size/",
 "sheet_txt": "https://xemstudio.com/objects/dc-motor-540-size/sheet.txt",
 "sheet": {
  "basis": "Mabuchi RS-540RH / RS-540SH dimension drawing; outside size also on Mabuchi's Let's Motorize line-up. 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 can is Ø35.8 × 50.0 mm.",
   "The Ø3.17 (1/8 in) shaft is drawn 13.0 mm out from the front face.",
   "Two M3 × 0.5 tapped holes on 25.0 mm centres, drawn at the major diameter 5.0 deep: the drawing allows screws 5.0 into the motor and no more.",
   "The front boss is Ø13.0 and the rear one Ø10.2; their heights did not come through in a form I could check, so neither is drawn. Clear Ø13.0 in a mount.",
   "Vent holes, terminal tabs and the wire exit are not drawn.",
   "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",
     "Ø35.8 × 50.0",
     "Mabuchi RS-540, Let's Motorize"
    ],
    [
     "shaft",
     "Ø3.17",
     "Mabuchi RS-540"
    ],
    [
     "shaft from the face",
     "13.0",
     "Mabuchi RS-540"
    ],
    [
     "face holes",
     "2 × M3 × 0.5 on 25.0",
     "Mabuchi RS-540"
    ],
    [
     "usable screw length",
     "5.0",
     "Mabuchi RS-540"
    ],
    [
     "front boss",
     "Ø13.0 (height not given here)",
     "Mabuchi RS-540"
    ],
    [
     "rear boss",
     "Ø10.2 (height not given here)",
     "Mabuchi RS-540"
    ]
   ]
  }
 },
 "sheet_text": "540 size brushed DC motor: Ø35.8 × 50.0 mm, 2 × M3 on 25 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/dc-motor-540-size/  (CC BY 4.0)\nBasis: Mabuchi RS-540RH / RS-540SH dimension drawing; outside size also on Mabuchi's Let's Motorize line-up. 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 can is Ø35.8 × 50.0 mm.\n- The Ø3.17 (1/8 in) shaft is drawn 13.0 mm out from the front face.\n- Two M3 × 0.5 tapped holes on 25.0 mm centres, drawn at the major diameter 5.0 deep: the drawing allows screws 5.0 into the motor and no more.\n- The front boss is Ø13.0 and the rear one Ø10.2; their heights did not come through in a form I could check, so neither is drawn. Clear Ø13.0 in a mount.\n- Vent holes, terminal tabs and the wire exit are not drawn.\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  Ø35.8 × 50.0  Mabuchi RS-540, Let's Motorize\nshaft  Ø3.17  Mabuchi RS-540\nshaft from the face  13.0  Mabuchi RS-540\nface holes  2 × M3 × 0.5 on 25.0  Mabuchi RS-540\nusable screw length  5.0  Mabuchi RS-540\nfront boss  Ø13.0 (height not given here)  Mabuchi RS-540\nrear boss  Ø10.2 (height not given here)  Mabuchi RS-540\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Mabuchi Motor (hosted by mikrocontroller.net): RS-540RH / RS-540SH datasheet and dimension drawing — PDF — manufacturer datasheet [verify license at link] — https://www.mikrocontroller.net/attachment/228490/rs_540rhsh.pdf\n- Mabuchi Motor: Let's Motorize: motor line-up with outside size (length × diameter) and shaft Ø for FA-130RA, RE-140RA, RE-260RA, RE-280RA, RS-380PH, RS-540SH — web — manufacturer page [verify license at link] — https://www.mabuchi-motor.co.jp/motorize/branch/motor/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/dc-motor-540-size/index.json\nAPI: https://xemstudio.com/api/geometry?object=dc-motor-540-size\n",
 "sources": [
  {
   "publisher": "Mabuchi Motor (hosted by mikrocontroller.net)",
   "title": "RS-540RH / RS-540SH datasheet and dimension drawing",
   "url": "https://www.mikrocontroller.net/attachment/228490/rs_540rhsh.pdf",
   "formats": [
    "PDF"
   ],
   "license": "manufacturer datasheet",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Mabuchi Motor",
   "title": "Let's Motorize: motor line-up with outside size (length × diameter) and shaft Ø for FA-130RA, RE-140RA, RE-260RA, RE-280RA, RS-380PH, RS-540SH",
   "url": "https://www.mabuchi-motor.co.jp/motorize/branch/motor/",
   "formats": [
    "web"
   ],
   "license": "manufacturer page",
   "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-550-555-size",
  "dc-motor-380-size",
  "775-dc-motor",
  "socket-head-cap-screws-metric"
 ],
 "fits": [
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "socket-head-cap-screws-metric",
     "why": "two M3 into the face holes, 25.0 apart, 5.0 max into the motor"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "dc-motor-550-555-size",
     "why": "same face, 57.0 can"
    },
    {
     "slug": "775-dc-motor",
     "why": "Ø42 can, Ø5 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": "Ø3.17",
   "mates": "pinion, pulley or coupler bore (set screw)",
   "fit": "slide",
   "files": "dc-540-"
  },
  {
   "feature": "mounting holes",
   "exact": "2 × M3 × 0.5 on 25.0, 5.0 usable depth",
   "mates": "M3 screws through the mount",
   "fit": "designed",
   "files": "dc-540-"
  },
  {
   "feature": "front boss (not drawn)",
   "exact": "Ø13.0",
   "mates": "mount recess",
   "fit": "socket",
   "files": "dc-540-"
  },
  {
   "feature": "can",
   "exact": "Ø35.8",
   "mates": "cradle",
   "fit": "socket",
   "files": "dc-540-"
  }
 ],
 "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 540 motor dimensions?",
   "a": "Ø35.8 × 50.0 mm can, Ø3.17 shaft 13.0 from the face, two M3 holes 25.0 apart, Ø13.0 front boss."
  },
  {
   "q": "What is the 540 motor hole spacing?",
   "a": "25.0 mm, two M3 × 0.5 tapped holes; screws no deeper than 5.0 mm into the motor."
  },
  {
   "q": "540 vs 550?",
   "a": "Same Ø35.8 can, Ø13.0 boss and M3-on-25.0 face; the 550 can is 57.0 long instead of 50.0."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "dc-540-size",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/dc-motor-540-size/dc-540-size.step",
   "stl": "https://xemstudio.com/files/hardware/dc-motor-540-size/dc-540-size.stl",
   "note": "540 size envelope: Ø35.8 × 50.0 can, Ø3.17 shaft 13.0 from the face, 2 × M3 on 25.0 drawn Ø3.0 × 5.0 (bosses not drawn)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/dc-motor-540-size/index.md"
}