{
 "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": "mgn-linear-rails",
 "name": "MGN9 / MGN12 / MGN15 miniature linear rails and carriages",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What are MGN12H carriage dimensions and mounting holes?",
 "tags": [
  "linear rail",
  "rail",
  "carriage",
  "motion"
 ],
 "aliases": [
  "mgn12h",
  "mgn12c",
  "mgn9h",
  "mgn15h",
  "linear guide",
  "hiwin rail"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 17,
 "url": "https://xemstudio.com/objects/mgn-linear-rails/",
 "sheet_txt": "https://xemstudio.com/objects/mgn-linear-rails/sheet.txt",
 "sheet": {
  "basis": "HIWIN MGN series catalogue dimensions (rail profile, hole pitch, carriage envelope and mounting pattern); other brands match",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Rail: MGN9 9 × 6.5 mm with 20 mm hole pitch; MGN12 12 × 8 mm, 25 mm pitch; MGN15 15 × 10 mm, 40 mm pitch. Holes Ø3.5 with Ø6 counterbore for M3.",
   "Carriage (H = long, C = short): MGN12H 45.4 × 27 × 13 mm assembled height, M3 holes on 20 × 20; MGN12C 34.7 long, holes 20 × 15. MGN9H 38.4 × 20 × 10, holes 15 × 20.",
   "Mount rails to a flat reference; printed mounts need the counterbores modeled (Ø6.2 × 4.5) so the M3 heads sit below the rail top."
  ],
  "table": {
   "columns": [
    "part",
    "length_mm",
    "width_mm",
    "height_mm",
    "holes",
    "pitch_or_pattern_mm"
   ],
   "rows": [
    [
     "MGN9 rail",
     "150–400",
     9,
     6.5,
     "Ø3.5 cbore Ø6",
     20
    ],
    [
     "MGN12 rail",
     "150–400",
     12,
     8,
     "Ø3.5 cbore Ø6",
     25
    ],
    [
     "MGN15 rail",
     "150–400",
     15,
     10,
     "Ø3.5 cbore Ø6",
     40
    ],
    [
     "MGN9C",
     28.9,
     20,
     10,
     "4 × M3",
     "15 × 10"
    ],
    [
     "MGN9H",
     38.4,
     20,
     10,
     "4 × M3",
     "15 × 20"
    ],
    [
     "MGN12C",
     34.7,
     27,
     13,
     "4 × M3",
     "20 × 15"
    ],
    [
     "MGN12H",
     45.4,
     27,
     13,
     "4 × M3",
     "20 × 20"
    ],
    [
     "MGN15H",
     58.8,
     32,
     16,
     "4 × M3",
     "25 × 20"
    ]
   ]
  }
 },
 "sheet_text": "MGN9 / MGN12 / MGN15 miniature linear rails and carriages — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/mgn-linear-rails/  (CC BY 4.0)\nBasis: HIWIN MGN series catalogue dimensions (rail profile, hole pitch, carriage envelope and mounting pattern); other brands match\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Rail: MGN9 9 × 6.5 mm with 20 mm hole pitch; MGN12 12 × 8 mm, 25 mm pitch; MGN15 15 × 10 mm, 40 mm pitch. Holes Ø3.5 with Ø6 counterbore for M3.\n- Carriage (H = long, C = short): MGN12H 45.4 × 27 × 13 mm assembled height, M3 holes on 20 × 20; MGN12C 34.7 long, holes 20 × 15. MGN9H 38.4 × 20 × 10, holes 15 × 20.\n- Mount rails to a flat reference; printed mounts need the counterbores modeled (Ø6.2 × 4.5) so the M3 heads sit below the rail top.\n\npart  length_mm  width_mm  height_mm  holes  pitch_or_pattern_mm\nMGN9 rail  150–400  9  6.5  Ø3.5 cbore Ø6  20\nMGN12 rail  150–400  12  8  Ø3.5 cbore Ø6  25\nMGN15 rail  150–400  15  10  Ø3.5 cbore Ø6  40\nMGN9C  28.9  20  10  4 × M3  15 × 10\nMGN9H  38.4  20  10  4 × M3  15 × 20\nMGN12C  34.7  27  13  4 × M3  20 × 15\nMGN12H  45.4  27  13  4 × M3  20 × 20\nMGN15H  58.8  32  16  4 × M3  25 × 20\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- HIWIN: MGN series linear guideway catalogue — PDF, STEP — HIWIN site terms [verify license at link] — https://www.hiwin.com/en/products/linear-guideways/mgn-mgw-series\n- Wikipedia: Linear-motion bearing — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Linear-motion_bearing\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 17 parts): https://xemstudio.com/files/hardware/mgn-linear-rails/index.json\nAPI: https://xemstudio.com/api/geometry?object=mgn-linear-rails\n",
 "sources": [
  {
   "publisher": "HIWIN",
   "title": "MGN series linear guideway catalogue",
   "url": "https://www.hiwin.com/en/products/linear-guideways/mgn-mgw-series",
   "formats": [
    "PDF",
    "STEP"
   ],
   "license": "HIWIN site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Linear-motion bearing",
   "url": "https://en.wikipedia.org/wiki/Linear-motion_bearing",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
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  "sheet_free": true,
  "mesh_price_usd": null,
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  "tolerance_mm": null
 },
 "related": [
  "socket-head-cap-screws-metric",
  "2020-extrusion",
  "lead-screw-t8",
  "gt2-pulleys",
  "lm8uu-linear-bearing"
 ],
 "faq": [
  {
   "q": "What are MGN12H carriage dimensions?",
   "a": "45.4 mm long, 27 mm wide, 13 mm high from the rail bottom; four M3 holes on a 20 × 20 mm pattern."
  },
  {
   "q": "What is the hole spacing on an MGN12 rail?",
   "a": "25 mm pitch, Ø3.5 holes with a Ø6 counterbore 4.5 deep, for M3 socket screws. MGN9 is 20 mm pitch, MGN15 is 40."
  },
  {
   "q": "MGN12C vs MGN12H?",
   "a": "Same width and height; C is the short block (34.7 mm, holes 20 × 15), H is the long block (45.4 mm, holes 20 × 20) with more load capacity."
  }
 ],
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