{
 "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": "3-5-inch-hard-drive",
 "name": "3.5 inch hard drive (SFF-8301)",
 "kind": "modern",
 "category": "Electronics",
 "group": "Computer storage",
 "year": null,
 "question": "What are the dimensions of a 3.5 inch hard drive?",
 "tags": [
  "hard drive",
  "hdd",
  "3.5 inch",
  "computer"
 ],
 "aliases": [
  "3.5 hard drive dimensions",
  "3.5 inch hdd size",
  "3.5 drive mounting holes"
 ],
 "overall_mm": {
  "length": 147,
  "width": 101.6,
  "height": 26.1
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/3-5-inch-hard-drive/",
 "sheet_txt": "https://xemstudio.com/objects/3-5-inch-hard-drive/sheet.txt",
 "sheet": {
  "basis": "SFF-8301 (SNIA SFF)",
  "overall_mm": {
   "length": 147,
   "width": 101.6,
   "height": 26.1
  },
  "notes": [
   "3.5 in drive: 101.6 mm wide, up to 147 mm long, 26.1 mm tall (1 in class; 17.8 and 42.0 also defined).",
   "Mounting: 6-32 UNC holes; bottom hole pair 41.28 mm and 44.45 / 76.20 mm from the reference per SFF-8301 table (dims A6, A7, A13); 95.25 mm hole spacing across.",
   "The file is the 101.6 × 147 × 26.1 envelope (holes not drawn: the open text does not tie each dimension to a face)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "width",
     "101.60 mm"
    ],
    [
     "length (max)",
     "147.00 mm"
    ],
    [
     "height",
     "26.10 mm (1 in drive)"
    ],
    [
     "thread",
     "6-32 UNC"
    ]
   ]
  }
 },
 "sheet_text": "3.5 inch hard drive (SFF-8301) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/3-5-inch-hard-drive/  (CC BY 4.0)\nBasis: SFF-8301 (SNIA SFF)\nCatalog version: 2026-10-20\n\nOverall (mm): length 147.0, width 101.6, height 26.1\n- 3.5 in drive: 101.6 mm wide, up to 147 mm long, 26.1 mm tall (1 in class; 17.8 and 42.0 also defined).\n- Mounting: 6-32 UNC holes; bottom hole pair 41.28 mm and 44.45 / 76.20 mm from the reference per SFF-8301 table (dims A6, A7, A13); 95.25 mm hole spacing across.\n- The file is the 101.6 × 147 × 26.1 envelope (holes not drawn: the open text does not tie each dimension to a face).\n\ndimension  value\nwidth  101.60 mm\nlength (max)  147.00 mm\nheight  26.10 mm (1 in drive)\nthread  6-32 UNC\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- SNIA SFF: SFF-8301 3.5 in form factor — web — Publisher's page; dimensions are facts — https://members.snia.org/document/dl/25862\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/3-5-inch-hard-drive/index.json\nAPI: https://xemstudio.com/api/geometry?object=3-5-inch-hard-drive\n",
 "sources": [
  {
   "publisher": "SNIA SFF",
   "title": "SFF-8301 3.5 in form factor",
   "url": "https://members.snia.org/document/dl/25862",
   "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": [
  "2-5-inch-drive",
  "m-2-2230-ssd",
  "m-2-2242-ssd",
  "m-2-2260-ssd",
  "m-2-2280-ssd"
 ],
 "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 a 3.5 inch hard drive?",
   "a": "101.6 × 147 × 26.1 mm."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "hdd-3-5-envelope",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/3-5-inch-hard-drive/hdd-3-5-envelope.step",
   "stl": "https://xemstudio.com/files/hardware/3-5-inch-hard-drive/hdd-3-5-envelope.stl",
   "note": "Envelope 147 × 101.6 × 26.1 mm"
  }
 ],
 "markdown": "https://xemstudio.com/objects/3-5-inch-hard-drive/index.md"
}