{
 "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": "acorn-cap-nuts-din-1587",
 "name": "Acorn (domed cap) nuts, DIN 1587 high type: M4–M24 dome diameter, overall height, across flats, thread depth",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the dimensions of a DIN 1587 acorn nut, and how tall is an M8 domed cap nut?",
 "tags": [
  "acorn nut",
  "cap nut",
  "dome nut",
  "domed cap nut",
  "din 1587",
  "hex acorn nut",
  "fastener",
  "tool"
 ],
 "aliases": [
  "din 1587 acorn nut dimensions",
  "m8 acorn nut height",
  "m6 cap nut size",
  "m10 dome nut dimensions",
  "acorn nut m5 across flats",
  "din 1587 m12",
  "m4 acorn nut size",
  "acorn nut dome diameter m8",
  "cap nut thread depth m6"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/acorn-cap-nuts-din-1587/",
 "sheet_txt": "https://xemstudio.com/objects/acorn-cap-nuts-din-1587/sheet.txt",
 "sheet": {
  "basis": "fasten.it's DIN 1587 table (07/2014) cross-checked against Westfield Fasteners' DIN 1587 table (same dk, h, s, t, e on M4 to M24; m differs, see notes); numbers only",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Columns (mm): P pitch; dk max, read as the dome diameter; h overall height (nominal = max); m max, read as the thread / body height; s width across flats (nominal = max; values in brackets are the alternative wrench widths the page prints for M10, M12, M14 and M22); e across corners (min); t min / max; x or g2 as printed on the right (x max for M4 to M10, g2 max for M12 and larger). The letters are the ones the pages print; fasten.it does not define them. Westfield's table (da, dk, dw, e, x, g2, h, m, r, s, t, w) agrees with fasten.it on dk, h, s, t and e (grade A minimum) for every size M4 to M24. The two disagree on m: fasten.it's coarse-thread m max is 10 for M10 (11.7 M12), Westfield prints m min 8.00 / max 7.64 for M10 (10.00 / 9.64 for M12), which equal fasten.it's fine-thread m (8.0, 10.0); the coarse values shown are fasten.it's and m is uncertain.",
   "fasten.it also has a fine-thread table (M8x1 to M24x2) with the same dk, h and s but smaller m (e.g. M10x1.25: m 8.0 against 10.0 coarse); it is not reproduced here. fasten.it's M22x1.5 row prints t min 25.58 against 28.58 for M22x2, and the M27 and M30 coarse rows print fewer values than the columns, so they are left out. Grade A and B minimum figures are in Westfield's table (e.g. M8 e min 14.38 for grade A, 14.20 max for grade B).",
   "No file: the dome profile (the radius r is only an auxiliary dimension) and the thread depth do not define a full solid in the sources read. McMaster-Carr sells acorn and cap nuts with per-part STEP; its metric acorn and cap-nut categories are linked, not copied. Nylon-insert nuts (domed or hex): nylon-insert-lock-nuts-iso-7040-din-985."
  ],
  "table": {
   "columns": [
    "thread",
    "P (mm)",
    "dk max",
    "h (nom = max)",
    "m max",
    "s (nom = max)",
    "e min",
    "t min / max",
    "x or g2 max"
   ],
   "rows": [
    [
     "M4",
     "0.7",
     "6.5",
     "8",
     "4.1",
     "7",
     "7.66",
     "5.26 / 5.74",
     "x 1.4"
    ],
    [
     "M5",
     "0.8",
     "7.5",
     "10",
     "5.4",
     "8",
     "8.79",
     "7.21 / 7.79",
     "x 1.6"
    ],
    [
     "M6",
     "1",
     "9.5",
     "12",
     "6",
     "10",
     "11.05",
     "7.71 / 8.29",
     "x 2"
    ],
    [
     "M8",
     "1.25",
     "12.5",
     "15",
     "8.5",
     "13",
     "14.38",
     "10.7 / 11.4",
     "x 2.5"
    ],
    [
     "M10",
     "1.5",
     "15",
     "18",
     "10",
     "16 (17)",
     "17.77",
     "12.7 / 13.4",
     "x 3"
    ],
    [
     "M12",
     "1.75",
     "17",
     "22",
     "11.7",
     "18 (19)",
     "20.03",
     "15.7 / 16.4",
     "g 6.4"
    ],
    [
     "M14",
     "2",
     "20",
     "25",
     "13",
     "21 (22)",
     "23.35",
     "17.7 / 18.4",
     "g 7.3"
    ],
    [
     "M16",
     "2",
     "23",
     "28",
     "16",
     "24",
     "26.75",
     "20.6 / 21.4",
     "g 7.3"
    ],
    [
     "M18",
     "2.5",
     "26",
     "32",
     "18.7",
     "27",
     "29.56",
     "24.6 / 25.4",
     "g 9.3"
    ],
    [
     "M20",
     "2.5",
     "28",
     "34",
     "19.7",
     "30",
     "32.95",
     "25.6 / 26.4",
     "g 9.3"
    ],
    [
     "M22",
     "2.5",
     "33",
     "39",
     "22.7",
     "32 (34)",
     "37.29",
     "28.6 / 29.4",
     "g 9.3"
    ],
    [
     "M24",
     "3",
     "34",
     "42",
     "23.5",
     "36",
     "39.55",
     "30.5 / 31.5",
     "g 10.7"
    ]
   ]
  }
 },
 "sheet_text": "Acorn (domed cap) nuts, DIN 1587 high type: M4–M24 dome diameter, overall height, across flats, thread depth — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/acorn-cap-nuts-din-1587/  (sheet CC BY 4.0)\nBasis: fasten.it's DIN 1587 table (07/2014) cross-checked against Westfield Fasteners' DIN 1587 table (same dk, h, s, t, e on M4 to M24; m differs, see notes); numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Columns (mm): P pitch; dk max, read as the dome diameter; h overall height (nominal = max); m max, read as the thread / body height; s width across flats (nominal = max; values in brackets are the alternative wrench widths the page prints for M10, M12, M14 and M22); e across corners (min); t min / max; x or g2 as printed on the right (x max for M4 to M10, g2 max for M12 and larger). The letters are the ones the pages print; fasten.it does not define them. Westfield's table (da, dk, dw, e, x, g2, h, m, r, s, t, w) agrees with fasten.it on dk, h, s, t and e (grade A minimum) for every size M4 to M24. The two disagree on m: fasten.it's coarse-thread m max is 10 for M10 (11.7 M12), Westfield prints m min 8.00 / max 7.64 for M10 (10.00 / 9.64 for M12), which equal fasten.it's fine-thread m (8.0, 10.0); the coarse values shown are fasten.it's and m is uncertain.\n- fasten.it also has a fine-thread table (M8x1 to M24x2) with the same dk, h and s but smaller m (e.g. M10x1.25: m 8.0 against 10.0 coarse); it is not reproduced here. fasten.it's M22x1.5 row prints t min 25.58 against 28.58 for M22x2, and the M27 and M30 coarse rows print fewer values than the columns, so they are left out. Grade A and B minimum figures are in Westfield's table (e.g. M8 e min 14.38 for grade A, 14.20 max for grade B).\n- No file: the dome profile (the radius r is only an auxiliary dimension) and the thread depth do not define a full solid in the sources read. McMaster-Carr sells acorn and cap nuts with per-part STEP; its metric acorn and cap-nut categories are linked, not copied. Nylon-insert nuts (domed or hex): nylon-insert-lock-nuts-iso-7040-din-985.\n\nthread  P (mm)  dk max  h (nom = max)  m max  s (nom = max)  e min  t min / max  x or g2 max\nM4  0.7  6.5  8  4.1  7  7.66  5.26 / 5.74  x 1.4\nM5  0.8  7.5  10  5.4  8  8.79  7.21 / 7.79  x 1.6\nM6  1  9.5  12  6  10  11.05  7.71 / 8.29  x 2\nM8  1.25  12.5  15  8.5  13  14.38  10.7 / 11.4  x 2.5\nM10  1.5  15  18  10  16 (17)  17.77  12.7 / 13.4  x 3\nM12  1.75  17  22  11.7  18 (19)  20.03  15.7 / 16.4  g 6.4\nM14  2  20  25  13  21 (22)  23.35  17.7 / 18.4  g 7.3\nM16  2  23  28  16  24  26.75  20.6 / 21.4  g 7.3\nM18  2.5  26  32  18.7  27  29.56  24.6 / 25.4  g 9.3\nM20  2.5  28  34  19.7  30  32.95  25.6 / 26.4  g 9.3\nM22  2.5  33  39  22.7  32 (34)  37.29  28.6 / 29.4  g 9.3\nM24  3  34  42  23.5  36  39.55  30.5 / 31.5  g 10.7\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- fasten.it: DIN 1587 hexagon domed cap nuts, high type (07/2014): d, P, da, dk, dw, e, x, g2, h, m, r, s, t, w; coarse M4 to M30 and fine thread — web — Reference page; numbers only. The page does not define the column letters — https://fasten.it/norms/norm/din_1587\n- Westfield Fasteners: DIN 1587 dome nuts M4 to M24: da, dk, dw, e, h, m, r, s, t, w (Table 1) — web — Publisher's page; dimensions are facts — https://westfieldfasteners.co.uk/Standards/Nut-Dome-M.pdf\n- McMaster-Carr: Metric acorn nuts (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/metric-acorn-nuts\n- McMaster-Carr: Metric cap nuts (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/metric-cap-nuts/\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=acorn-cap-nuts-din-1587\n",
 "sources": [
  {
   "publisher": "fasten.it",
   "title": "DIN 1587 hexagon domed cap nuts, high type (07/2014): d, P, da, dk, dw, e, x, g2, h, m, r, s, t, w; coarse M4 to M30 and fine thread",
   "url": "https://fasten.it/norms/norm/din_1587",
   "formats": [
    "web"
   ],
   "license": "Reference page; numbers only. The page does not define the column letters",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Westfield Fasteners",
   "title": "DIN 1587 dome nuts M4 to M24: da, dk, dw, e, h, m, r, s, t, w (Table 1)",
   "url": "https://westfieldfasteners.co.uk/Standards/Nut-Dome-M.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Metric acorn nuts (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/metric-acorn-nuts",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Metric cap nuts (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/metric-cap-nuts/",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "hex-nuts-metric",
  "hex-nuts-metric-m10-m24",
  "nylon-insert-lock-nuts-iso-7040-din-985",
  "flange-nuts-din-6923",
  "square-nuts-din-557"
 ],
 "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": [],
 "faq": [
  {
   "q": "How tall is an M8 acorn nut?",
   "a": "15 mm overall (DIN 1587 high type), 13 mm across flats, dome diameter 12.5 mm max (fasten.it; Westfield agrees)."
  },
  {
   "q": "What wrench size is an M10 acorn nut?",
   "a": "16 mm, with 17 mm printed as an alternative on fasten.it (the s = 17 column in brackets)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/acorn-cap-nuts-din-1587/index.md"
}