{
 "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": "hiwin-mgn12h-linear-guide-block",
 "name": "HIWIN MGN12H miniature linear guide block: 27 × 45.4 body, M3 20 × 20 holes and rail interface",
 "kind": "modern",
 "category": "Hardware",
 "group": "Bearings, rails & motion",
 "year": null,
 "question": "What are the HIWIN MGN12H block dimensions and mounting-hole positions?",
 "tags": [
  "mgn12h",
  "mgn12 carriage",
  "linear guide block",
  "miniature linear rail",
  "hiwin mgn",
  "linear carriage mounting holes"
 ],
 "aliases": [
  "MGN12H",
  "HIWIN MGN12H",
  "MGN12H block",
  "MGN12 carriage",
  "MGN12H dimensions",
  "MGN12 linear guide block",
  "MGNR12R rail block"
 ],
 "overall_mm": {
  "length": 45.4,
  "width": 27,
  "height": 10
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/hiwin-mgn12h-linear-guide-block/",
 "sheet_txt": "https://xemstudio.com/objects/hiwin-mgn12h-linear-guide-block/sheet.txt",
 "sheet": {
  "basis": "HIWIN Linear Guideway catalogue, MGN series tables for the MGN12 block and MGNR12R rail.",
  "overall_mm": {
   "length": 45.4,
   "width": 27,
   "height": 10
  },
  "notes": [
   "Datum: block centre; block underside at 0, top mounting face at 10.0. In assembly the underside is H1 3.0 above the rail bottom and the top face H 13.0 above it.",
   "Block width W 27.0, overall length L 45.4 including end caps and seals (steel body L1 32.4).",
   "Four M3 × 3.5 deep tapped holes in the top face on B × C = 20 × 20, centred on the block (modelled Ø2.5 tap drill).",
   "Underside rail channel 12.0 wide × 5.0 tall along the full length. Mating rail MGNR12R: width 12, height 8.0, M3 cap screws in Ø6.0 × 4.5 counterbores with Ø3.5 through holes at pitch 25.",
   "Not modelled: end-seal and end-cap profile, the Ø2 lube hole, ball grooves and retainer, and the rail.",
   "Dimensions are exact nominal (true size), no tolerance added."
  ],
  "table": {
   "columns": [
    "hole",
    "x (mm)",
    "y (mm)",
    "thread"
   ],
   "rows": [
    [
     "1",
     "−10.0",
     "−10.0",
     "M3 × 3.5"
    ],
    [
     "2",
     "+10.0",
     "−10.0",
     "M3 × 3.5"
    ],
    [
     "3",
     "−10.0",
     "+10.0",
     "M3 × 3.5"
    ],
    [
     "4",
     "+10.0",
     "+10.0",
     "M3 × 3.5"
    ]
   ]
  }
 },
 "sheet_text": "HIWIN MGN12H miniature linear guide block: 27 × 45.4 body, M3 20 × 20 holes and rail interface — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/hiwin-mgn12h-linear-guide-block/  (sheet CC BY 4.0)\nBasis: HIWIN Linear Guideway catalogue, MGN series tables for the MGN12 block and MGNR12R rail.\nCatalog version: 2026-10-20\n\nOverall (mm): length 45.4, width 27.0, height 10.0\n- Datum: block centre; block underside at 0, top mounting face at 10.0. In assembly the underside is H1 3.0 above the rail bottom and the top face H 13.0 above it.\n- Block width W 27.0, overall length L 45.4 including end caps and seals (steel body L1 32.4).\n- Four M3 × 3.5 deep tapped holes in the top face on B × C = 20 × 20, centred on the block (modelled Ø2.5 tap drill).\n- Underside rail channel 12.0 wide × 5.0 tall along the full length. Mating rail MGNR12R: width 12, height 8.0, M3 cap screws in Ø6.0 × 4.5 counterbores with Ø3.5 through holes at pitch 25.\n- Not modelled: end-seal and end-cap profile, the Ø2 lube hole, ball grooves and retainer, and the rail.\n- Dimensions are exact nominal (true size), no tolerance added.\n\nhole  x (mm)  y (mm)  thread\n1  −10.0  −10.0  M3 × 3.5\n2  +10.0  −10.0  M3 × 3.5\n3  −10.0  +10.0  M3 × 3.5\n4  +10.0  +10.0  M3 × 3.5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- HIWIN (catalogue via DAMENCNC): HIWIN MGN and MGW Product Catalog 2023 — web — Publisher's page; dimensions are facts — https://damencnc.com/userdata/file/3455-3_HIWIN_MGN_and_MGW_Product_Catalog_2023.pdf\n- HIWIN (catalogue via Motion USA): HIWIN MG Series 2025 — web — Publisher's page; dimensions are facts — https://s3.amazonaws.com/www.motionusa.com/hiwin/2025/MG%20Series-2025.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/hiwin-mgn12h-linear-guide-block/index.json\nAPI: https://xemstudio.com/api/geometry?object=hiwin-mgn12h-linear-guide-block\n",
 "sources": [
  {
   "publisher": "HIWIN (catalogue via DAMENCNC)",
   "title": "HIWIN MGN and MGW Product Catalog 2023",
   "url": "https://damencnc.com/userdata/file/3455-3_HIWIN_MGN_and_MGW_Product_Catalog_2023.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "HIWIN (catalogue via Motion USA)",
   "title": "HIWIN MG Series 2025",
   "url": "https://s3.amazonaws.com/www.motionusa.com/hiwin/2025/MG%20Series-2025.pdf",
   "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
 },
 "related": [
  "hiwin-mgn-miniature-guideway-mgn5-mgn15",
  "mgn-rails",
  "socket-head-cap-screws-metric",
  "2020-aluminum-extrusion",
  "hiwin-hg-linear-guideway-hgr-hgh-hgw-15-35"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. 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. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [
  {
   "feature": "top mounting holes",
   "exact": "4 × M3 on 20 × 20, 3.5 deep",
   "mates": "carriage plate M3 screws (at most 3.5 mm engagement)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "rail channel",
   "exact": "12.0 wide, top face 13.0 above the rail bottom",
   "mates": "MGNR12R rail",
   "fit": "run",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.",
  "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. ISO 286 equivalent: H7/g6 or H7/h6.",
  "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.",
  "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 is the MGN12H mounting-hole pattern?",
   "a": "Four M3 holes, 3.5 mm deep, on a 20 × 20 mm square centred on the block."
  },
  {
   "q": "How tall is an MGN12H on its rail?",
   "a": "13.0 mm from the rail bottom to the block top (block underside 3.0 mm above the rail bottom)."
  },
  {
   "q": "How long is the MGN12H?",
   "a": "45.4 mm including end caps and seals; the steel body is 32.4 mm. Width 27.0 mm."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "hiwin-mgn12h-linear-guide-block",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hiwin-mgn12h-linear-guide-block/hiwin-mgn12h-linear-guide-block.step",
   "stl": "https://xemstudio.com/files/hardware/hiwin-mgn12h-linear-guide-block/hiwin-mgn12h-linear-guide-block.stl",
   "note": "HIWIN MGN12H miniature linear guide block: 27 × 45.4 body, M3 20 × 20 holes and rail interface"
  }
 ],
 "markdown": "https://xemstudio.com/objects/hiwin-mgn12h-linear-guide-block/index.md"
}