{
 "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": "nema-steppers-8-to-34",
 "name": "NEMA 8, 11, 14, 23 and 34 stepper motors",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What is the NEMA 23 mounting hole pattern?",
 "tags": [
  "motor",
  "stepper",
  "nema 23",
  "nema 14",
  "motion"
 ],
 "aliases": [
  "nema 23",
  "nema 14",
  "nema 11",
  "nema 8",
  "nema 34",
  "stepper motor sizes",
  "nema 23 mount"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 10,
 "url": "https://xemstudio.com/objects/nema-steppers-8-to-34/",
 "sheet_txt": "https://xemstudio.com/objects/nema-steppers-8-to-34/sheet.txt",
 "sheet": {
  "basis": "NEMA ICS 16 frame sizes; shaft and boss dimensions as commonly supplied (check the specific motor's drawing for body length)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The NEMA number is the face width in tenths of an inch: NEMA 17 = 1.7 in = 42.3 mm. The face and hole pattern are fixed; body length varies with torque.",
   "NEMA 23: 56.4 mm face, 47.14 mm (1.856 in) hole pattern, Ø5.1 holes (#10-32 or M5), Ø38.1 boss, Ø6.35 shaft. NEMA 34: 86 mm face, 69.6 mm pattern, Ø14 shaft.",
   "NEMA 14: 35.2 face, 26 mm pattern, M3; NEMA 11: 28.2 face, 23 mm pattern, M2.5; NEMA 8: 20.2 face, 16 mm pattern, M2, Ø4 shaft."
  ],
  "table": {
   "columns": [
    "nema",
    "face_mm",
    "hole_pattern_mm",
    "hole_dia_mm",
    "boss_dia_mm",
    "shaft_dia_mm",
    "shaft_len_mm",
    "common_body_mm"
   ],
   "rows": [
    [
     "8",
     20.2,
     16,
     2.2,
     15,
     1.5,
     4,
     10,
     "30, 38"
    ],
    [
     "11",
     28.2,
     23,
     2.6,
     22,
     2,
     5,
     20,
     "32, 45"
    ],
    [
     "14",
     35.2,
     26,
     3,
     22,
     2,
     5,
     20,
     "28, 36"
    ],
    [
     "17",
     42.3,
     31,
     3,
     22,
     2,
     5,
     22,
     "34, 40, 48"
    ],
    [
     "23",
     56.4,
     47.14,
     5.1,
     38.1,
     1.6,
     6.35,
     21,
     "56, 76"
    ],
    [
     "34",
     86,
     69.6,
     6.5,
     73,
     1.6,
     14,
     37,
     "80, 115"
    ]
   ]
  }
 },
 "sheet_text": "NEMA 8, 11, 14, 23 and 34 stepper motors — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/nema-steppers-8-to-34/  (CC BY 4.0)\nBasis: NEMA ICS 16 frame sizes; shaft and boss dimensions as commonly supplied (check the specific motor's drawing for body length)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The NEMA number is the face width in tenths of an inch: NEMA 17 = 1.7 in = 42.3 mm. The face and hole pattern are fixed; body length varies with torque.\n- NEMA 23: 56.4 mm face, 47.14 mm (1.856 in) hole pattern, Ø5.1 holes (#10-32 or M5), Ø38.1 boss, Ø6.35 shaft. NEMA 34: 86 mm face, 69.6 mm pattern, Ø14 shaft.\n- NEMA 14: 35.2 face, 26 mm pattern, M3; NEMA 11: 28.2 face, 23 mm pattern, M2.5; NEMA 8: 20.2 face, 16 mm pattern, M2, Ø4 shaft.\n\nnema  face_mm  hole_pattern_mm  hole_dia_mm  boss_dia_mm  shaft_dia_mm  shaft_len_mm  common_body_mm\n8  20.2  16.0  2.2  15.0  1.5  4.0  10  30, 38\n11  28.2  23.0  2.6  22.0  2.0  5.0  20  32, 45\n14  35.2  26.0  3.0  22.0  2.0  5.0  20  28, 36\n17  42.3  31.0  3.0  22.0  2.0  5.0  22  34, 40, 48\n23  56.4  47.14  5.1  38.1  1.6  6.35  21  56, 76\n34  86.0  69.6  6.5  73.0  1.6  14.0  37  80, 115\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Stepper motor — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stepper_motor\n- NEMA: ICS 16 motion/position control motors and controls — PDF — NEMA standard, purchase — https://www.nema.org/standards/view/motion-position-control-motors-controls-and-feedback-devices\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 10 parts): https://xemstudio.com/files/hardware/nema-steppers-8-to-34/index.json\nAPI: https://xemstudio.com/api/geometry?object=nema-steppers-8-to-34\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Stepper motor",
   "url": "https://en.wikipedia.org/wiki/Stepper_motor",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "NEMA",
   "title": "ICS 16 motion/position control motors and controls",
   "url": "https://www.nema.org/standards/view/motion-position-control-motors-controls-and-feedback-devices",
   "formats": [
    "PDF"
   ],
   "license": "NEMA standard, purchase",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "nema-17-stepper",
  "shaft-couplers",
  "gt2-pulleys",
  "socket-head-cap-screws-metric",
  "ball-bearings-metric"
 ],
 "faq": [
  {
   "q": "What is the NEMA 23 bolt pattern?",
   "a": "Four holes on a 47.14 mm (1.856 in) square, Ø5.1 mm, on a 56.4 mm face; Ø38.1 mm pilot boss; Ø6.35 mm (1/4 in) shaft."
  },
  {
   "q": "What is the NEMA 14 hole pattern?",
   "a": "26 mm square, M3, on a 35.2 mm face; Ø22 boss; Ø5 shaft."
  },
  {
   "q": "NEMA 17 vs NEMA 23 size?",
   "a": "42.3 mm vs 56.4 mm face; 31 vs 47.14 mm hole pattern; 5 vs 6.35 mm shaft. Mounts are not interchangeable."
  },
  {
   "q": "What is the NEMA 34 shaft size?",
   "a": "14 mm (some 12.7 mm / 1/2 in); 86 mm face, 69.6 mm hole pattern, Ø73 mm boss."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "nema8-30",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema8-30.step",
   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema8-30.stl",
   "note": "NEMA 8 envelope, 30 mm body, 16.0 mm hole pattern, Ø4.0 shaft"
  },
  {
   "file": "nema8-38",
   "formats": [
    "step",
    "stl"
   ],
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema8-38.step",
   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema8-38.stl",
   "note": "NEMA 8 envelope, 38 mm body, 16.0 mm hole pattern, Ø4.0 shaft"
  },
  {
   "file": "nema11-32",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema11-32.step",
   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema11-32.stl",
   "note": "NEMA 11 envelope, 32 mm body, 23.0 mm hole pattern, Ø5.0 shaft"
  },
  {
   "file": "nema11-45",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema11-45.step",
   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema11-45.stl",
   "note": "NEMA 11 envelope, 45 mm body, 23.0 mm hole pattern, Ø5.0 shaft"
  },
  {
   "file": "nema14-28",
   "formats": [
    "step",
    "stl"
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema14-28.stl",
   "note": "NEMA 14 envelope, 28 mm body, 26.0 mm hole pattern, Ø5.0 shaft"
  },
  {
   "file": "nema14-36",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema14-36.step",
   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema14-36.stl",
   "note": "NEMA 14 envelope, 36 mm body, 26.0 mm hole pattern, Ø5.0 shaft"
  },
  {
   "file": "nema23-56",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-56.step",
   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-56.stl",
   "note": "NEMA 23 envelope, 56 mm body, 47.14 mm hole pattern, Ø6.35 shaft"
  },
  {
   "file": "nema23-76",
   "formats": [
    "step",
    "stl"
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   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-76.stl",
   "note": "NEMA 23 envelope, 76 mm body, 47.14 mm hole pattern, Ø6.35 shaft"
  },
  {
   "file": "nema34-80",
   "formats": [
    "step",
    "stl"
   ],
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   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema34-80.stl",
   "note": "NEMA 34 envelope, 80 mm body, 69.6 mm hole pattern, Ø14.0 shaft"
  },
  {
   "file": "nema34-115",
   "formats": [
    "step",
    "stl"
   ],
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema34-115.stl",
   "note": "NEMA 34 envelope, 115 mm body, 69.6 mm hole pattern, Ø14.0 shaft"
  }
 ],
 "markdown": "https://xemstudio.com/objects/nema-steppers-8-to-34/index.md"
}