{
 "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": "rack-19in-ears",
 "name": "19-inch rack units and mounting ears (EIA-310)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Mounts",
 "year": null,
 "question": "What are 1U rack mount dimensions?",
 "tags": [
  "rack",
  "1u",
  "19 inch",
  "mount"
 ],
 "aliases": [
  "1u height",
  "rack unit",
  "19 inch rack dimensions",
  "rack ears",
  "eia-310"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 2,
 "url": "https://xemstudio.com/objects/rack-19in-ears/",
 "sheet_txt": "https://xemstudio.com/objects/rack-19in-ears/sheet.txt",
 "sheet": {
  "basis": "EIA-310-D / IEC 60297: 19 in rack, 1U = 44.45 mm, hole spacing 15.875 / 15.875 / 12.7 mm, mounting rails 465.1 mm apart",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "1U = 44.45 mm (1.75 in). Equipment height is 1U minus about 0.8 mm so panels don't bind: a 1U faceplate is 43.6 mm tall; 2U is 88.1 mm.",
   "Hole pattern per U: 6.35 / 22.225 / 38.1 mm from the U boundary (15.875-15.875-12.7 repeating). Rail-to-rail inside width 450.85 mm; hole centres 465.1 mm apart; faceplate width 482.6 mm (19 in).",
   "Cage nuts take 9.5 mm square holes (M6 or 10-32 screws); threaded rails are usually 10-32 or M6.",
   "Files are ear test plates with the slot pattern for 1U and 2U."
  ],
  "table": {
   "columns": [
    "dimension",
    "mm"
   ],
   "rows": [
    [
     "1U",
     44.45
    ],
    [
     "1U faceplate height",
     43.6
    ],
    [
     "hole offsets within a U",
     "6.35, 22.225, 38.1"
    ],
    [
     "rail hole centres (width)",
     465.1
    ],
    [
     "inside rail width",
     450.85
    ],
    [
     "faceplate width",
     482.6
    ],
    [
     "cage nut square hole",
     9.5
    ]
   ]
  }
 },
 "sheet_text": "19-inch rack units and mounting ears (EIA-310) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/rack-19in-ears/  (CC BY 4.0)\nBasis: EIA-310-D / IEC 60297: 19 in rack, 1U = 44.45 mm, hole spacing 15.875 / 15.875 / 12.7 mm, mounting rails 465.1 mm apart\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 1U = 44.45 mm (1.75 in). Equipment height is 1U minus about 0.8 mm so panels don't bind: a 1U faceplate is 43.6 mm tall; 2U is 88.1 mm.\n- Hole pattern per U: 6.35 / 22.225 / 38.1 mm from the U boundary (15.875-15.875-12.7 repeating). Rail-to-rail inside width 450.85 mm; hole centres 465.1 mm apart; faceplate width 482.6 mm (19 in).\n- Cage nuts take 9.5 mm square holes (M6 or 10-32 screws); threaded rails are usually 10-32 or M6.\n- Files are ear test plates with the slot pattern for 1U and 2U.\n\ndimension  mm\n1U  44.45\n1U faceplate height  43.6\nhole offsets within a U  6.35, 22.225, 38.1\nrail hole centres (width)  465.1\ninside rail width  450.85\nfaceplate width  482.6\ncage nut square hole  9.5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: 19-inch rack — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/19-inch_rack\n- Wikipedia: Rack unit — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Rack_unit\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/rack-19in-ears/index.json\nAPI: https://xemstudio.com/api/geometry?object=rack-19in-ears\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "19-inch rack",
   "url": "https://en.wikipedia.org/wiki/19-inch_rack",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Rack unit",
   "url": "https://en.wikipedia.org/wiki/Rack_unit",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "vesa-mount-patterns",
  "socket-head-cap-screws-metric",
  "imperial-machine-screws",
  "panel-cutouts"
 ],
 "faq": [
  {
   "q": "How tall is 1U?",
   "a": "44.45 mm (1.75 in). Make a 1U panel 43.6 mm so it clears the neighbours; 2U panels are 88.1 mm."
  },
  {
   "q": "What is the 19 inch rack hole spacing?",
   "a": "Three holes per U at 6.35, 22.225 and 38.1 mm from the U boundary (gaps of 15.875, 15.875, 12.7 mm); the two rails' hole centres are 465.1 mm apart."
  },
  {
   "q": "What size are rack screws?",
   "a": "10-32 in most US racks, M6 in most EU racks and with cage nuts; the cage-nut hole is 9.5 mm square."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "rack-ear-1u",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/rack-19in-ears/rack-ear-1u.step",
   "stl": "https://xemstudio.com/files/hardware/rack-19in-ears/rack-ear-1u.stl",
   "note": "1U rack ear test plate: 44.45 mm per U, slots at 6.35 / 22.225 / 38.1"
  },
  {
   "file": "rack-ear-2u",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/rack-19in-ears/rack-ear-2u.step",
   "stl": "https://xemstudio.com/files/hardware/rack-19in-ears/rack-ear-2u.stl",
   "note": "2U rack ear test plate: 44.45 mm per U, slots at 6.35 / 22.225 / 38.1"
  }
 ],
 "markdown": "https://xemstudio.com/objects/rack-19in-ears/index.md"
}