{
 "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": "wing-screws-din-316",
 "name": "Wing screws, DIN 316 (round wings, German form), M4–M24: boss, wing span, height and nominal lengths",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the dimensions of a DIN 316 wing screw, and what lengths does each size come in?",
 "tags": [
  "wing screw",
  "thumb screw",
  "butterfly screw",
  "din 316",
  "hand screw",
  "fastener"
 ],
 "aliases": [
  "din 316 wing screw dimensions",
  "m6 wing screw dimensions",
  "m8 wing bolt size",
  "wing screw lengths m10",
  "din 316 m5",
  "wing screw wing span",
  "wing bolt dimensions metric",
  "din 316 m12 height",
  "butterfly screw size chart"
 ],
 "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/wing-screws-din-316/",
 "sheet_txt": "https://xemstudio.com/objects/wing-screws-din-316/sheet.txt",
 "sheet": {
  "basis": "fasten.it DIN 316 table; numbers only. The values for d2, e, g1, h and m equal the minimum values of the DIN 315 wing nut D1, e, g, h and m for the same size, as printed by the same site",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "DIN 316 is the wing screw with rounded wings, product grade C, M4 to M24; the table columns are the page's own letters (P pitch, a, d2, d3, e, g1, g2, h, m) in mm, with the minimum or maximum as headed. The page does not define the letters, so none is interpreted here. Comparing with the DIN 315 table from the same site: d2 equals D1 min, e equals e min, g1 equals g min, h equals h min and m equals m min for every size M4 to M24, so the wing and boss envelope of the screw is the same as the matching DIN 315 nut's minimum figures.",
   "Lengths are the commercial nominal lengths listed on the page for each size (mm); the length is not a dimension of the head. Material (steel, malleable iron, copper-zinc alloy) is named in the scope; property class is not given.",
   "DIN 316 is the metric 'German form' of the wing screw; the American form with edged wings is DIN 318 and is not on this page. Wing nuts: wing-nuts-din-315-asme-b18-17; knurled thumb screws: knurled-thumb-screws-din-464.",
   "No file: the wing outline is not published as numbers in the source read, so a drawing would be invented. McMaster-Carr lists thumb screws and wing-style hand screws with per-part STEP; its thumb-screw categories are linked, not copied."
  ],
  "table": {
   "columns": [
    "size",
    "P (mm)",
    "a max",
    "d2 min",
    "d3 min",
    "e min",
    "g1 min",
    "g2 min",
    "h min",
    "m min",
    "nominal lengths l (mm)"
   ],
   "rows": [
    [
     "M4",
     "0.7",
     "2.1",
     "6",
     "5.5",
     "18",
     "1.1",
     "1.7",
     "8.5",
     "3.2",
     "6, 8, 10, 12, 14, 16, 18"
    ],
    [
     "M5",
     "0.8",
     "2.4",
     "8",
     "7.5",
     "24",
     "1.5",
     "2.3",
     "11",
     "4",
     "8, 10, 12, 14, 16, 18, 20, 25, 30"
    ],
    [
     "M6",
     "1",
     "3",
     "10",
     "9",
     "30",
     "1.5",
     "2.7",
     "15",
     "5",
     "8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40"
    ],
    [
     "M8",
     "1.25",
     "4",
     "13",
     "10.5",
     "36",
     "2",
     "3.6",
     "18",
     "6.5",
     "10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45, 50"
    ],
    [
     "M10",
     "1.5",
     "4.5",
     "17",
     "14.5",
     "48",
     "3.6",
     "4.6",
     "23",
     "8",
     "16, 18, 20, 25, 30, 35, 40, 45, 50"
    ],
    [
     "M12",
     "1.75",
     "5.3",
     "20",
     "17.5",
     "62",
     "4.1",
     "5.6",
     "31",
     "10",
     "16, 18, 20, 25, 30, 35, 40, 45, 50, 60"
    ],
    [
     "M16",
     "2",
     "6",
     "26",
     "21",
     "70",
     "5.6",
     "6.5",
     "35",
     "13",
     "20, 25, 30, 35, 40, 45, 50, 60"
    ],
    [
     "M20",
     "2.5",
     "7.5",
     "32",
     "27",
     "86",
     "6.1",
     "7",
     "44",
     "16",
     "30, 35, 40, 45, 50, 60"
    ],
    [
     "M24",
     "3",
     "9",
     "41",
     "35",
     "106",
     "8.6",
     "9.5",
     "53.5",
     "20",
     "35, 40, 45, 50, 60"
    ]
   ]
  }
 },
 "sheet_text": "Wing screws, DIN 316 (round wings, German form), M4–M24: boss, wing span, height and nominal lengths — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/wing-screws-din-316/  (sheet CC BY 4.0)\nBasis: fasten.it DIN 316 table; numbers only. The values for d2, e, g1, h and m equal the minimum values of the DIN 315 wing nut D1, e, g, h and m for the same size, as printed by the same site\nCatalog version: 2026-10-20\n\nSizes: see table below\n- DIN 316 is the wing screw with rounded wings, product grade C, M4 to M24; the table columns are the page's own letters (P pitch, a, d2, d3, e, g1, g2, h, m) in mm, with the minimum or maximum as headed. The page does not define the letters, so none is interpreted here. Comparing with the DIN 315 table from the same site: d2 equals D1 min, e equals e min, g1 equals g min, h equals h min and m equals m min for every size M4 to M24, so the wing and boss envelope of the screw is the same as the matching DIN 315 nut's minimum figures.\n- Lengths are the commercial nominal lengths listed on the page for each size (mm); the length is not a dimension of the head. Material (steel, malleable iron, copper-zinc alloy) is named in the scope; property class is not given.\n- DIN 316 is the metric 'German form' of the wing screw; the American form with edged wings is DIN 318 and is not on this page. Wing nuts: wing-nuts-din-315-asme-b18-17; knurled thumb screws: knurled-thumb-screws-din-464.\n- No file: the wing outline is not published as numbers in the source read, so a drawing would be invented. McMaster-Carr lists thumb screws and wing-style hand screws with per-part STEP; its thumb-screw categories are linked, not copied.\n\nsize  P (mm)  a max  d2 min  d3 min  e min  g1 min  g2 min  h min  m min  nominal lengths l (mm)\nM4  0.7  2.1  6  5.5  18  1.1  1.7  8.5  3.2  6, 8, 10, 12, 14, 16, 18\nM5  0.8  2.4  8  7.5  24  1.5  2.3  11  4  8, 10, 12, 14, 16, 18, 20, 25, 30\nM6  1  3  10  9  30  1.5  2.7  15  5  8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40\nM8  1.25  4  13  10.5  36  2  3.6  18  6.5  10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45, 50\nM10  1.5  4.5  17  14.5  48  3.6  4.6  23  8  16, 18, 20, 25, 30, 35, 40, 45, 50\nM12  1.75  5.3  20  17.5  62  4.1  5.6  31  10  16, 18, 20, 25, 30, 35, 40, 45, 50, 60\nM16  2  6  26  21  70  5.6  6.5  35  13  20, 25, 30, 35, 40, 45, 50, 60\nM20  2.5  7.5  32  27  86  6.1  7  44  16  30, 35, 40, 45, 50, 60\nM24  3  9  41  35  106  8.6  9.5  53.5  20  35, 40, 45, 50, 60\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- fasten.it: DIN 316 Standard Dimensions for wing screws with rounded wings (M4 to M24, product grade C, 1998-07): P, a, d2, d3, e, g1, g2, h, m; commercial lengths per size — web — Reference page; numbers only. The page does not define the column letters — https://fasten.it/norms/norm/din_316\n- fasten.it: DIN 315 Standard Dimensions for wing nuts, rounded wings (M4 to M24, product class C): P, D1, e, h, g, m (max / min), DIN 315:1998-07 — web — Reference page; numbers only. The page does not define the column letters — https://fasten.it/norms/norm/din_315\n- McMaster-Carr: Knurled-head thumb screws (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/knurled-head-thumb-screws\n- McMaster-Carr: Metric steel thumb screws (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-steel-thumb-screws\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=wing-screws-din-316\n",
 "sources": [
  {
   "publisher": "fasten.it",
   "title": "DIN 316 Standard Dimensions for wing screws with rounded wings (M4 to M24, product grade C, 1998-07): P, a, d2, d3, e, g1, g2, h, m; commercial lengths per size",
   "url": "https://fasten.it/norms/norm/din_316",
   "formats": [
    "web"
   ],
   "license": "Reference page; numbers only. The page does not define the column letters",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "fasten.it",
   "title": "DIN 315 Standard Dimensions for wing nuts, rounded wings (M4 to M24, product class C): P, D1, e, h, g, m (max / min), DIN 315:1998-07",
   "url": "https://fasten.it/norms/norm/din_315",
   "formats": [
    "web"
   ],
   "license": "Reference page; numbers only. The page does not define the column letters",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Knurled-head thumb screws (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/knurled-head-thumb-screws",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Metric steel thumb screws (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/metric-steel-thumb-screws",
   "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": [
  "wing-nuts-din-315-asme-b18-17",
  "knurled-thumb-screws-din-464",
  "hex-head-screws-metric",
  "socket-head-cap-screws-metric",
  "imperial-machine-screws"
 ],
 "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": "What lengths does an M6 DIN 316 wing screw come in?",
   "a": "8, 10, 12, 14, 16, 18, 20, 25, 30, 35 and 40 mm on the fasten.it page."
  },
  {
   "q": "How wide is an M8 DIN 316 wing screw?",
   "a": "The page prints e min 36 mm (wing span), height h min 18 mm and d2 min 13 mm; no maximum is printed for those columns."
  },
  {
   "q": "Is a DIN 316 wing screw the same size as a DIN 315 wing nut?",
   "a": "For the same thread size the d2, e, g1, h and m minimum values equal the DIN 315 D1, e, g, h and m minimum values on the same site."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/wing-screws-din-316/index.md"
}