{
 "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": "jga25-370-gearmotor",
 "name": "JGA25-370 gearmotor: Ø25 gearbox on a 370 can, Ø4 D-shaft",
 "kind": "hardware",
 "category": "Electronics",
 "group": "Motors",
 "year": null,
 "question": "What are the dimensions of a JGA25-370 gear motor?",
 "tags": [
  "jga25-370",
  "gearmotor",
  "geared motor",
  "dc motor",
  "25mm gear motor",
  "motor",
  "motor envelope",
  "stirling"
 ],
 "aliases": [
  "jga25-370 dimensions",
  "ga25-370 dimensions",
  "25ga-370 gear motor",
  "jga25 mounting holes",
  "25mm gear motor dimensions",
  "jga25-370 step",
  "jga25-370 stl"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 3,
 "url": "https://xemstudio.com/objects/jga25-370-gearmotor/",
 "sheet_txt": "https://xemstudio.com/objects/jga25-370-gearmotor/sheet.txt",
 "sheet": {
  "basis": "RCDrone JGA25-370 listing (drawing values); the can matches Mabuchi's RF-370CA (Ø24.4 × 30.8). 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.",
   "A Ø25 spur gearbox in front of a 370 can (Ø24.4 × 30.8). The gearbox length L depends on the ratio: 17 (4.4:1, 9.6:1), 19 (21.3:1), 21 (35.5:1, 46.8:1), 23 (78:1, 103:1), 25 (171:1, 226:1), 27 (377:1, 500:1). Files: L = 17, 21 and 27.",
   "Output: a Ø4 shaft on the gearbox axis with a D-flat 3.5 across, 8 mm long at the tip; the shaft stands 12.1 mm from the gearbox face, including a Ø7 × 2.5 boss.",
   "Two M3 tapped holes 4.5 deep on 17 mm centres in the gearbox face, drawn at the major diameter.",
   "The rear boss (Ø6.4), terminals and any encoder are not drawn. The listing notes sizes can vary between batches.",
   "A gearmotor turned backwards by an engine runs the gearbox as a step-up; DIY Stirling builders use small gearmotors this way as low-speed generators."
  ],
  "table": {
   "columns": [
    "feature",
    "mm",
    "from"
   ],
   "rows": [
    [
     "gearbox",
     "Ø25 × 17 to 27 (by ratio)",
     "RCDrone"
    ],
    [
     "can",
     "Ø24.4 × 30.8",
     "RCDrone, Mabuchi RF-370CA"
    ],
    [
     "boss",
     "Ø7 × 2.5",
     "RCDrone"
    ],
    [
     "shaft",
     "Ø4, D-flat 3.5 across × 8",
     "RCDrone"
    ],
    [
     "shaft from the gearbox face",
     "12.1",
     "RCDrone"
    ],
    [
     "face holes",
     "2 × M3 × 4.5 deep on 17",
     "RCDrone"
    ]
   ]
  }
 },
 "sheet_text": "JGA25-370 gearmotor: Ø25 gearbox on a 370 can, Ø4 D-shaft — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/jga25-370-gearmotor/  (CC BY 4.0)\nBasis: RCDrone JGA25-370 listing (drawing values); the can matches Mabuchi's RF-370CA (Ø24.4 × 30.8). 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- A Ø25 spur gearbox in front of a 370 can (Ø24.4 × 30.8). The gearbox length L depends on the ratio: 17 (4.4:1, 9.6:1), 19 (21.3:1), 21 (35.5:1, 46.8:1), 23 (78:1, 103:1), 25 (171:1, 226:1), 27 (377:1, 500:1). Files: L = 17, 21 and 27.\n- Output: a Ø4 shaft on the gearbox axis with a D-flat 3.5 across, 8 mm long at the tip; the shaft stands 12.1 mm from the gearbox face, including a Ø7 × 2.5 boss.\n- Two M3 tapped holes 4.5 deep on 17 mm centres in the gearbox face, drawn at the major diameter.\n- The rear boss (Ø6.4), terminals and any encoder are not drawn. The listing notes sizes can vary between batches.\n- A gearmotor turned backwards by an engine runs the gearbox as a step-up; DIY Stirling builders use small gearmotors this way as low-speed generators.\n\nfeature  mm  from\ngearbox  Ø25 × 17 to 27 (by ratio)  RCDrone\ncan  Ø24.4 × 30.8  RCDrone, Mabuchi RF-370CA\nboss  Ø7 × 2.5  RCDrone\nshaft  Ø4, D-flat 3.5 across × 8  RCDrone\nshaft from the gearbox face  12.1  RCDrone\nface holes  2 × M3 × 4.5 deep on 17  RCDrone\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- RCDrone: JGA25-370 gearmotor listing with drawing values: gearbox Ø25 × L by ratio, can Ø24.4 × 30.8, Ø4 D-shaft (3.5 across the flat) 12.1 out, boss Ø7 × 2.5, 2 × M3 × 4.5 deep on 17 — web — listing [verify license at link] — https://rcdrone.top/products/jga25-370-dc-gear-motor\n- Mabuchi Motor (hosted by IBS Electronics): RF-370CA datasheet and dimension drawing — PDF — manufacturer datasheet [verify license at link] — https://datasheets.ibselectronics.com/RF370CA-15370-Mabuchi-datasheet-7281042.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/jga25-370-gearmotor/index.json\nAPI: https://xemstudio.com/api/geometry?object=jga25-370-gearmotor\n",
 "sources": [
  {
   "publisher": "RCDrone",
   "title": "JGA25-370 gearmotor listing with drawing values: gearbox Ø25 × L by ratio, can Ø24.4 × 30.8, Ø4 D-shaft (3.5 across the flat) 12.1 out, boss Ø7 × 2.5, 2 × M3 × 4.5 deep on 17",
   "url": "https://rcdrone.top/products/jga25-370-dc-gear-motor",
   "formats": [
    "web"
   ],
   "license": "listing",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Mabuchi Motor (hosted by IBS Electronics)",
   "title": "RF-370CA datasheet and dimension drawing",
   "url": "https://datasheets.ibselectronics.com/RF370CA-15370-Mabuchi-datasheet-7281042.pdf",
   "formats": [
    "PDF"
   ],
   "license": "manufacturer datasheet",
   "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-370-size",
  "n20-gearmotor",
  "tt-gearmotor",
  "shaft-collars",
  "spur-gears-involute",
  "socket-head-cap-screws-metric"
 ],
 "fits": [
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "shaft-collars",
     "why": "Ø4 collar on the output shaft (slide)"
    },
    {
     "slug": "spur-gears-involute",
     "why": "module 1 16 T gear with a Ø4 bore on the shaft (slide)"
    },
    {
     "slug": "socket-head-cap-screws-metric",
     "why": "two M3 into the gearbox face, 17 apart, 4.5 max"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "n20-gearmotor",
     "why": "much smaller 12 × 10 gearmotor"
    },
    {
     "slug": "dc-motor-370-size",
     "why": "the same can without the gearbox"
    }
   ]
  }
 ],
 "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": "output shaft",
   "exact": "Ø4, D-flat 3.5 across × 8",
   "mates": "hub, collar or gear bore (set screw on the flat)",
   "fit": "slide",
   "files": "jga25-"
  },
  {
   "feature": "front boss",
   "exact": "Ø7 × 2.5",
   "mates": "mount recess",
   "fit": "socket",
   "files": "jga25-"
  },
  {
   "feature": "mounting holes",
   "exact": "2 × M3 × 4.5 deep on 17",
   "mates": "M3 screws through the mount",
   "fit": "designed",
   "files": "jga25-"
  },
  {
   "feature": "gearbox",
   "exact": "Ø25",
   "mates": "cradle or clamp",
   "fit": "socket",
   "files": "jga25-"
  }
 ],
 "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 JGA25-370 dimensions?",
   "a": "Ø25 gearbox 17–27 long by ratio, on a Ø24.4 × 30.8 can; Ø4 D-shaft 12.1 out (incl. a Ø7 × 2.5 boss); two M3 holes 17 mm apart, 4.5 deep."
  },
  {
   "q": "What shaft does a JGA25-370 have?",
   "a": "Ø4 mm with a D-flat 3.5 mm across, 8 mm long, on the gearbox axis."
  },
  {
   "q": "How long is the JGA25-370 gearbox?",
   "a": "17 mm at 4.4:1 and 9.6:1, up to 27 mm at 377:1 and 500:1."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "jga25-370-gearbox-17",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-17.step",
   "stl": "https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-17.stl",
   "note": "JGA25-370 envelope, gearbox Ø25 × 17: 370 can Ø24.4 × 30.8, boss Ø7 × 2.5, Ø4 D-shaft (3.5 across the flat, flat 8 long) 12.1 from the gearbox face, 2 × M3 × 4.5 deep on 17"
  },
  {
   "file": "jga25-370-gearbox-21",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-21.step",
   "stl": "https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-21.stl",
   "note": "JGA25-370 envelope, gearbox Ø25 × 21: 370 can Ø24.4 × 30.8, boss Ø7 × 2.5, Ø4 D-shaft (3.5 across the flat, flat 8 long) 12.1 from the gearbox face, 2 × M3 × 4.5 deep on 17"
  },
  {
   "file": "jga25-370-gearbox-27",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-27.step",
   "stl": "https://xemstudio.com/files/hardware/jga25-370-gearmotor/jga25-370-gearbox-27.stl",
   "note": "JGA25-370 envelope, gearbox Ø25 × 27: 370 can Ø24.4 × 30.8, boss Ø7 × 2.5, Ø4 D-shaft (3.5 across the flat, flat 8 long) 12.1 from the gearbox face, 2 × M3 × 4.5 deep on 17"
  }
 ],
 "markdown": "https://xemstudio.com/objects/jga25-370-gearmotor/index.md"
}