{
 "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": "feetech-fs90r-continuous-rotation-servo",
 "name": "Feetech FS90R continuous rotation servo",
 "kind": "modern",
 "category": "RC cars",
 "group": "Servos",
 "year": null,
 "question": "What are the dimensions of the Feetech FS90R continuous rotation servo?",
 "tags": [
  "servo",
  "continuous rotation servo",
  "micro servo",
  "feetech",
  "robot"
 ],
 "aliases": [
  "fs90r dimensions",
  "fs90r size",
  "feetech fs90r",
  "fs90r",
  "360 servo dimensions",
  "continuous rotation servo size",
  "servo rotación continua",
  "servo de rotação contínua",
  "Servo Dauerrotation"
 ],
 "overall_mm": {
  "length": 22.5,
  "width": 12.1,
  "height": 27.7
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/feetech-fs90r-continuous-rotation-servo/",
 "sheet_txt": "https://xemstudio.com/objects/feetech-fs90r-continuous-rotation-servo/sheet.txt",
 "sheet": {
  "basis": "Feetech FS90R datasheet (maker PDF, hosted by Pololu); Pololu spec table (secondary)",
  "overall_mm": {
   "length": 22.5,
   "width": 12.1,
   "height": 27.7
  },
  "notes": [
   "The Feetech FS90R is a 9 g, 360° continuous-rotation micro servo. Feetech's datasheet gives its size as A 22.5 mm, B 12.1 mm, C 27.7 mm, a 21-tooth (4.86 mm) output spline, a 250 mm lead and 4.8–6 V.",
   "Feetech does not say in text which axis C is; it is taken as the overall height, the larger of the two published third dimensions, so the envelope encloses the body either way. Pololu's 23.4 mm likely leaves out the shaft boss — check yours before cutting a tight pocket.",
   "The file is an envelope box 22.5 × 12.1 × 27.7 mm at the published size, true size, no printing allowance. Mounting ears, output shaft and lead are not modelled."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "A (body length)",
     "22.5 mm"
    ],
    [
     "B (body width)",
     "12.1 mm"
    ],
    [
     "C",
     "27.7 mm (datasheet); Pololu lists 23.4 mm"
    ],
    [
     "weight",
     "9 g ± 0.2"
    ],
    [
     "output spline",
     "21 T (4.86 mm)"
    ],
    [
     "lead",
     "250 mm ± 5 (datasheet); Pololu 10 in"
    ],
    [
     "voltage",
     "4.8–6 V"
    ],
    [
     "pulse range / stop",
     "700–2300 µs / 1500 µs"
    ],
    [
     "stall torque",
     "1.3 kg·cm (4.8 V), 1.5 kg·cm (6 V)"
    ],
    [
     "no-load speed",
     "80 rpm (4.8 V), 100 rpm (6 V)"
    ],
    [
     "mounting-ear span and holes",
     "on the datasheet drawing only (not in text)"
    ]
   ]
  }
 },
 "sheet_text": "Feetech FS90R continuous rotation servo — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/feetech-fs90r-continuous-rotation-servo/  (sheet CC BY 4.0)\nBasis: Feetech FS90R datasheet (maker PDF, hosted by Pololu); Pololu spec table (secondary)\nCatalog version: 2026-10-20\n\nOverall (mm): length 22.5, width 12.1, height 27.7\n- The Feetech FS90R is a 9 g, 360° continuous-rotation micro servo. Feetech's datasheet gives its size as A 22.5 mm, B 12.1 mm, C 27.7 mm, a 21-tooth (4.86 mm) output spline, a 250 mm lead and 4.8–6 V.\n- Feetech does not say in text which axis C is; it is taken as the overall height, the larger of the two published third dimensions, so the envelope encloses the body either way. Pololu's 23.4 mm likely leaves out the shaft boss — check yours before cutting a tight pocket.\n- The file is an envelope box 22.5 × 12.1 × 27.7 mm at the published size, true size, no printing allowance. Mounting ears, output shaft and lead are not modelled.\n\ndimension  value\nA (body length)  22.5 mm\nB (body width)  12.1 mm\nC  27.7 mm (datasheet); Pololu lists 23.4 mm\nweight  9 g ± 0.2\noutput spline  21 T (4.86 mm)\nlead  250 mm ± 5 (datasheet); Pololu 10 in\nvoltage  4.8–6 V\npulse range / stop  700–2300 µs / 1500 µs\nstall torque  1.3 kg·cm (4.8 V), 1.5 kg·cm (6 V)\nno-load speed  80 rpm (4.8 V), 100 rpm (6 V)\nmounting-ear span and holes  on the datasheet drawing only (not in text)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Feetech (via Pololu): FS90R datasheet (PDF) — web — Publisher's page; dimensions are facts — https://www.pololu.com/file/0J1867/FS90R.pdf\n- Pololu (retailer): FS90R specs — web — Publisher's page; dimensions are facts — https://www.pololu.com/product/2820/specs\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/feetech-fs90r-continuous-rotation-servo/index.json\nAPI: https://xemstudio.com/api/geometry?object=feetech-fs90r-continuous-rotation-servo\n",
 "sources": [
  {
   "publisher": "Feetech (via Pololu)",
   "title": "FS90R datasheet (PDF)",
   "url": "https://www.pololu.com/file/0J1867/FS90R.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Pololu (retailer)",
   "title": "FS90R specs",
   "url": "https://www.pololu.com/product/2820/specs",
   "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
 },
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  "spektrum-a2030l-linear-servo",
  "emax-es9251-ii-servo",
  "emax-es9051-servo",
  "hitec-hs-35hd-servo",
  "towerpro-sg90-micro-servo",
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 ],
 "fits": [],
 "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": [],
 "faq": [
  {
   "q": "How big is the FS90R?",
   "a": "22.5 × 12.1 mm body; 27.7 mm third dimension on Feetech's datasheet (Pololu lists 23.4 mm). 9 g, 21-tooth spline."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "feetech-fs90r-continuous-rotation-servo-envelope",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/feetech-fs90r-continuous-rotation-servo/feetech-fs90r-continuous-rotation-servo-envelope.step",
   "stl": "https://xemstudio.com/files/hardware/feetech-fs90r-continuous-rotation-servo/feetech-fs90r-continuous-rotation-servo-envelope.stl",
   "note": "An envelope box 22.5 × 12.1 × 27.7 mm (Mounting ears, output shaft and lead are not modelled)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/feetech-fs90r-continuous-rotation-servo/index.md"
}