{
 "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": "hex-nuts-collar-din-6331",
 "name": "Hexagon nuts with collar, 1.5 d high, DIN 6331: M6–M36 across flats, collar diameter, height",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the DIN 6331 collar nut dimensions (across flats, height, collar diameter and height) for M6 to M36?",
 "tags": [
  "din 6331",
  "collar nut",
  "fixture nut",
  "clamping nut",
  "hex nut 1.5d",
  "flange nut",
  "fixture"
 ],
 "aliases": [
  "din 6331 dimensions",
  "collar nut m12 18 mm",
  "m10 clamping nut collar diameter",
  "fixture nut 1.5d",
  "din 6331 m16 height"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 9,
 "url": "https://xemstudio.com/objects/hex-nuts-collar-din-6331/",
 "sheet_txt": "https://xemstudio.com/objects/hex-nuts-collar-din-6331/sheet.txt",
 "sheet": {
  "basis": "fasteners.eu DIN 6331 table (a, d1, e, m, s), cross-checked against Ganter's and AMF's DIN 6331 tables",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Columns: thread, width across flats s, total height m (1.5 d), collar diameter d1, collar height a. Ganter and AMF give the same values (e.g. M12: SW18, m 18, collar Ø25 × 4).",
   "M14 is omitted (sources disagree on the collar height); M10 and M12 are also sold as SW17 / SW19 variants. Thread drawn as a plain bore at the major diameter."
  ],
  "table": {
   "columns": [
    "thread",
    "s",
    "m",
    "d1",
    "a"
   ],
   "rows": [
    [
     "M6",
     "10",
     "9",
     "14",
     "3"
    ],
    [
     "M8",
     "13",
     "12",
     "18",
     "3.5"
    ],
    [
     "M10",
     "16",
     "15",
     "22",
     "4"
    ],
    [
     "M12",
     "18",
     "18",
     "25",
     "4"
    ],
    [
     "M16",
     "24",
     "24",
     "31",
     "5"
    ],
    [
     "M20",
     "30",
     "30",
     "37",
     "6"
    ],
    [
     "M24",
     "36",
     "36",
     "45",
     "6"
    ],
    [
     "M30",
     "46",
     "45",
     "58",
     "8"
    ],
    [
     "M36",
     "55",
     "54",
     "68",
     "10"
    ]
   ]
  }
 },
 "sheet_text": "Hexagon nuts with collar, 1.5 d high, DIN 6331: M6–M36 across flats, collar diameter, height — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/hex-nuts-collar-din-6331/  (sheet CC BY 4.0)\nBasis: fasteners.eu DIN 6331 table (a, d1, e, m, s), cross-checked against Ganter's and AMF's DIN 6331 tables\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Columns: thread, width across flats s, total height m (1.5 d), collar diameter d1, collar height a. Ganter and AMF give the same values (e.g. M12: SW18, m 18, collar Ø25 × 4).\n- M14 is omitted (sources disagree on the collar height); M10 and M12 are also sold as SW17 / SW19 variants. Thread drawn as a plain bore at the major diameter.\n\nthread  s  m  d1  a\nM6  10  9  14  3\nM8  13  12  18  3.5\nM10  16  15  22  4\nM12  18  18  25  4\nM16  24  24  31  5\nM20  30  30  37  6\nM24  36  36  45  6\nM30  46  45  58  8\nM36  55  54  68  10\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- fasteners.eu: DIN 6331 hexagon nuts with collar, height 1.5 d: a, d1, e, m, s — web — Publisher's page; dimensions are facts — https://www.fasteners.eu/standards/DIN/6331/\n- Ganter: DIN 6331 hex nuts with collar — web — Publisher's page; dimensions are facts — https://reiman.pt/pub/media/technical_data/GANTER/datasheets/DIN 6331.pdf\n- AMF: Hexagonal nuts with collar 1.5 d high — web — Publisher's page; dimensions are facts — https://www.amf.de/en_us/hexagonal-nuts-with-collar-15-d-high-82230\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 9 parts): https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/index.json\nAPI: https://xemstudio.com/api/geometry?object=hex-nuts-collar-din-6331\n",
 "sources": [
  {
   "publisher": "fasteners.eu",
   "title": "DIN 6331 hexagon nuts with collar, height 1.5 d: a, d1, e, m, s",
   "url": "https://www.fasteners.eu/standards/DIN/6331/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Ganter",
   "title": "DIN 6331 hex nuts with collar",
   "url": "https://reiman.pt/pub/media/technical_data/GANTER/datasheets/DIN 6331.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "AMF",
   "title": "Hexagonal nuts with collar 1.5 d high",
   "url": "https://www.amf.de/en_us/hexagonal-nuts-with-collar-15-d-high-82230",
   "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": [
  "t-slot-nuts-din-508",
  "flange-nuts-din-6923",
  "coupling-nuts-din-6334-and-inch",
  "hex-nuts-metric-m10-m24"
 ],
 "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": "collar",
   "exact": "Ø d1 × a: 14 × 3 (M6) to 68 × 10 (M36); M12 25 × 4",
   "mates": "workpiece or clamp-strap face (no washer)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "thread (plain bore at the major Ø)",
   "exact": "d: M6 to M36",
   "mates": "fixture stud of the same thread",
   "fit": "designed",
   "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 are the dimensions of an M12 DIN 6331 nut?",
   "a": "18 mm across flats, 18 mm tall, Ø25 × 4 mm collar."
  },
  {
   "q": "Why use a collar nut on a fixture?",
   "a": "The collar spreads the clamping load without a loose washer, and the 1.5 d height takes repeated clamping."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "din6331-m6",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m6.step",
   "stl": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m6.stl",
   "note": "DIN 6331 M6: SW10, height 9, collar Ø14×3"
  },
  {
   "file": "din6331-m8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m8.step",
   "stl": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m8.stl",
   "note": "DIN 6331 M8: SW13, height 12, collar Ø18×3.5"
  },
  {
   "file": "din6331-m10",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m10.step",
   "stl": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m10.stl",
   "note": "DIN 6331 M10: SW16, height 15, collar Ø22×4"
  },
  {
   "file": "din6331-m12",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m12.step",
   "stl": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m12.stl",
   "note": "DIN 6331 M12: SW18, height 18, collar Ø25×4"
  },
  {
   "file": "din6331-m16",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m16.step",
   "stl": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m16.stl",
   "note": "DIN 6331 M16: SW24, height 24, collar Ø31×5"
  },
  {
   "file": "din6331-m20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m20.step",
   "stl": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m20.stl",
   "note": "DIN 6331 M20: SW30, height 30, collar Ø37×6"
  },
  {
   "file": "din6331-m24",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m24.step",
   "stl": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m24.stl",
   "note": "DIN 6331 M24: SW36, height 36, collar Ø45×6"
  },
  {
   "file": "din6331-m30",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m30.stl",
   "note": "DIN 6331 M30: SW46, height 45, collar Ø58×8"
  },
  {
   "file": "din6331-m36",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m36.step",
   "stl": "https://xemstudio.com/files/hardware/hex-nuts-collar-din-6331/din6331-m36.stl",
   "note": "DIN 6331 M36: SW55, height 54, collar Ø68×10"
  }
 ],
 "markdown": "https://xemstudio.com/objects/hex-nuts-collar-din-6331/index.md"
}