{
 "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": "shoulder-screws-iso-7379",
 "name": "Shoulder screws ISO 7379 (metric): shoulder Ø, thread, head size, hex key, thread length, M5 to M20",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the dimensions of an ISO 7379 metric shoulder screw: shoulder diameter, thread, head diameter and height, hex key size and thread length?",
 "tags": [
  "shoulder screw",
  "shoulder bolt",
  "iso 7379",
  "socket head",
  "pivot",
  "bearing surface",
  "standard",
  "fastener"
 ],
 "aliases": [
  "iso 7379",
  "shoulder bolt dimensions",
  "shoulder screw dimensions metric",
  "m6 shoulder bolt",
  "m8 shoulder bolt 10mm",
  "m5 shoulder screw 6mm",
  "m10 shoulder bolt 13mm",
  "shoulder bolt hex key size",
  "shoulder screw thread length",
  "iso 7379 m8",
  "iso 7379 table",
  "shoulder bolt step",
  "shoulder bolt stl"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 7,
 "url": "https://xemstudio.com/objects/shoulder-screws-iso-7379/",
 "sheet_txt": "https://xemstudio.com/objects/shoulder-screws-iso-7379/sheet.txt",
 "sheet": {
  "basis": "ISO 7379:1983 sample pages, fasten.it, Ganter Norm and McMaster part mirrors; disagreements are listed rather than averaged; McMaster-Carr linked for CAD",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "ISO 7379 is the hexagon socket head shoulder screw: a hardened, ground shoulder of diameter d1 that acts as a bearing surface or pivot, then a shorter thread. The shoulder length l1 is the dimension you choose; thread size, head and key are fixed per shoulder diameter. Pitches are ISO coarse. Preferred l1 in the 1983 edition: 10, 12, 16, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 120 mm; shoulder tolerance f9 or h8 depending on the supplier.",
   "Where sources agree: head diameter and hex key size for all seven sizes (ISO 7379:1983 sample, fasten.it, Ganter Norm); shoulder diameter for M6, M8, M12 and M16 (8, 10, 16, 20); McMaster-Carr part mirrors match the 1983 sample for M5 (6 mm shoulder, head 10 × 5, 3 mm key) and M10 (13 mm shoulder, 10 mm head height, 6 mm key).",
   "Where sources disagree: shoulder diameter M5: 6 mm (ISO sample, Ganter, McMaster mirror) vs 6.5 mm (fasten.it); M10: 13 mm (ISO sample, fasten.it, McMaster mirror) vs 12 mm (Ganter, Accu Components); M20: 25 mm (ISO sample, fasten.it) vs 24 mm (Ganter). The table and files use the 1983 sample's values (6, 13, 25), the alternates are shown in brackets. Head height: the 1983 sample and the two McMaster mirrors give 5 (M5) and 10 (M10); fasten.it prints smaller maxima (4.5 to 16, in brackets); Accu lists 8.9 for M10; a Zoro M16 listing shows 14. M10 head diameter is 18 in the sample, fasten.it, Ganter and Accu but 19 on the McMaster mirror. If head height or the M10 / M5 / M20 shoulder matters, measure your part.",
   "Thread length b is fasten.it's maximum (corroborated by Accu: 16.4 for M10; McMaster mirrors 10 for M5, 16 for M10; Zoro 22 for M16); the socket depth t is fasten.it's minimum and has no second source. Shoulder length ranges differ between fasten.it and Ganter, so both are shown; Ganter also lists M3 (4 mm shoulder) and M4 (5 mm), noted there as not in the official ISO sheet, which are not used.",
   "Files: seven shoulder screws, one per thread size at an example shoulder length (40 mm; 50 mm for M20), as one revolved solid with a hex socket. The thread is a plain cylinder at the nominal major diameter over the thread length b; no real thread, thread neck, head chamfer or underhead radius, because the tables do not give them. Shoulder length is yours to choose; edit the model for another l1.",
   "Inch shoulder screws (ASME B18.3) are on the companion page. McMaster-Carr's shoulder screw category with an ISO 7379 filter is linked below (free per-part STEP/IGES there; not hosted here)."
  ],
  "table": {
   "columns": [
    "thread d2",
    "pitch P, mm",
    "shoulder Ø d1, mm (other sources)",
    "head Ø d3 (max), mm",
    "head height k, mm (fasten.it k max)",
    "hex key s, mm",
    "thread length b (max), mm",
    "socket depth t (min), mm",
    "shoulder length l1 range, mm (fasten.it / Ganter)"
   ],
   "rows": [
    [
     "M5",
     "0.8",
     "6 (fasten.it 6.5)",
     "10",
     "5 (4.5)",
     "3",
     "9.75",
     "2.4",
     "10–40 / 10–80"
    ],
    [
     "M6",
     "1",
     "8",
     "13",
     "6 (5.5)",
     "4",
     "11.25",
     "3.3",
     "12–50 / 16–100"
    ],
    [
     "M8",
     "1.25",
     "10",
     "16",
     "8 (7)",
     "5",
     "13.25",
     "4.2",
     "16–120 / 16–100"
    ],
    [
     "M10",
     "1.5",
     "13 (Ganter 12)",
     "18",
     "10 (9)",
     "6",
     "16.4",
     "4.9",
     "16–120 / 16–100"
    ],
    [
     "M12",
     "1.75",
     "16",
     "24",
     "12 (11)",
     "8",
     "18.4",
     "6.6",
     "30–120 / 25–100"
    ],
    [
     "M16",
     "2",
     "20",
     "30",
     "16 (14)",
     "10",
     "22.4",
     "8.8",
     "40–120 / 30–100"
    ],
    [
     "M20",
     "2.5",
     "25 (Ganter 24)",
     "36",
     "20 (16)",
     "12",
     "27.4",
     "10",
     "50–120 / 50–100"
    ]
   ]
  }
 },
 "sheet_text": "Shoulder screws ISO 7379 (metric): shoulder Ø, thread, head size, hex key, thread length, M5 to M20 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/shoulder-screws-iso-7379/  (sheet CC BY 4.0)\nBasis: ISO 7379:1983 sample pages, fasten.it, Ganter Norm and McMaster part mirrors; disagreements are listed rather than averaged; McMaster-Carr linked for CAD\nCatalog version: 2026-10-20\n\nSizes: see table below\n- ISO 7379 is the hexagon socket head shoulder screw: a hardened, ground shoulder of diameter d1 that acts as a bearing surface or pivot, then a shorter thread. The shoulder length l1 is the dimension you choose; thread size, head and key are fixed per shoulder diameter. Pitches are ISO coarse. Preferred l1 in the 1983 edition: 10, 12, 16, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 120 mm; shoulder tolerance f9 or h8 depending on the supplier.\n- Where sources agree: head diameter and hex key size for all seven sizes (ISO 7379:1983 sample, fasten.it, Ganter Norm); shoulder diameter for M6, M8, M12 and M16 (8, 10, 16, 20); McMaster-Carr part mirrors match the 1983 sample for M5 (6 mm shoulder, head 10 × 5, 3 mm key) and M10 (13 mm shoulder, 10 mm head height, 6 mm key).\n- Where sources disagree: shoulder diameter M5: 6 mm (ISO sample, Ganter, McMaster mirror) vs 6.5 mm (fasten.it); M10: 13 mm (ISO sample, fasten.it, McMaster mirror) vs 12 mm (Ganter, Accu Components); M20: 25 mm (ISO sample, fasten.it) vs 24 mm (Ganter). The table and files use the 1983 sample's values (6, 13, 25), the alternates are shown in brackets. Head height: the 1983 sample and the two McMaster mirrors give 5 (M5) and 10 (M10); fasten.it prints smaller maxima (4.5 to 16, in brackets); Accu lists 8.9 for M10; a Zoro M16 listing shows 14. M10 head diameter is 18 in the sample, fasten.it, Ganter and Accu but 19 on the McMaster mirror. If head height or the M10 / M5 / M20 shoulder matters, measure your part.\n- Thread length b is fasten.it's maximum (corroborated by Accu: 16.4 for M10; McMaster mirrors 10 for M5, 16 for M10; Zoro 22 for M16); the socket depth t is fasten.it's minimum and has no second source. Shoulder length ranges differ between fasten.it and Ganter, so both are shown; Ganter also lists M3 (4 mm shoulder) and M4 (5 mm), noted there as not in the official ISO sheet, which are not used.\n- Files: seven shoulder screws, one per thread size at an example shoulder length (40 mm; 50 mm for M20), as one revolved solid with a hex socket. The thread is a plain cylinder at the nominal major diameter over the thread length b; no real thread, thread neck, head chamfer or underhead radius, because the tables do not give them. Shoulder length is yours to choose; edit the model for another l1.\n- Inch shoulder screws (ASME B18.3) are on the companion page. McMaster-Carr's shoulder screw category with an ISO 7379 filter is linked below (free per-part STEP/IGES there; not hosted here).\n\nthread d2  pitch P, mm  shoulder Ø d1, mm (other sources)  head Ø d3 (max), mm  head height k, mm (fasten.it k max)  hex key s, mm  thread length b (max), mm  socket depth t (min), mm  shoulder length l1 range, mm (fasten.it / Ganter)\nM5  0.8  6 (fasten.it 6.5)  10  5 (4.5)  3  9.75  2.4  10–40 / 10–80\nM6  1  8  13  6 (5.5)  4  11.25  3.3  12–50 / 16–100\nM8  1.25  10  16  8 (7)  5  13.25  4.2  16–120 / 16–100\nM10  1.5  13 (Ganter 12)  18  10 (9)  6  16.4  4.9  16–120 / 16–100\nM12  1.75  16  24  12 (11)  8  18.4  6.6  30–120 / 25–100\nM16  2  20  30  16 (14)  10  22.4  8.8  40–120 / 30–100\nM20  2.5  25 (Ganter 24)  36  20 (16)  12  27.4  10  50–120 / 50–100\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- iTeh Standards: ISO 7379:1983 sample pages: shoulder d1, thread, head d, k, socket s, preferred lengths — web — Publisher's page; dimensions are facts — https://cdn.standards.iteh.ai/samples/14078/66d6be2c979341abb895fa52330708be/ISO-7379-1983.pdf\n- fasten.it: ISO 7379 Standard dimensions for hexagon socket head shoulder screws (M5 to M20): thread length b max, socket depth t min, k max — web — Publisher's page; dimensions are facts — https://fasten.it/en/norms/norm/iso_7379\n- Ganter Norm: ISO 7379 shoulder screws, steel, with collar: d1, d2, l1, d3, s (and the 4 / M3, 5 / M4 non-ISO sizes) — web — Publisher's page; dimensions are facts — https://ganternorm.com/en/products/3.2-Mounting-positioning-levelling-with-screws-clamping-and-supporting-elements/Swing-bolts-Shoulder-screws-Thrust-bolts/ISO-7379-Shoulder-screws\n- SKDIN (distributor, McMaster part mirror): M5 ISO 7379 shoulder screw 92981A149: 6 mm shoulder, head 10 x 5, socket 3 — web — Publisher's page; dimensions are facts — https://www.skdin.com/products/productid-0537FA00027\n- SKDIN (distributor, McMaster part mirror): M10 ISO 7379 shoulder screw 90265A374: 13 mm shoulder, head 19 x 10 — web — Publisher's page; dimensions are facts — https://www.skdin.com/products/productid-0543FA00205\n- Accu Components: M10 x 20 socket shoulder screw ISO 7379 (12 mm shoulder, 16.4 thread length, head 18 x 8.9) — web — Publisher's page; dimensions are facts — https://accu-components.com/us/metric-socket-shoulder-screws/10490-SSH-M10-20-12-9\n- McMaster-Carr: Shoulder screws, ISO 7379 filter (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/shoulder-screws/specifications-met~iso-7379\n- McMaster-Carr: Steel shoulder screws (inch and metric) (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/steel-shoulder-screws/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/shoulder-screws-iso-7379/index.json\nAPI: https://xemstudio.com/api/geometry?object=shoulder-screws-iso-7379\n",
 "sources": [
  {
   "publisher": "iTeh Standards",
   "title": "ISO 7379:1983 sample pages: shoulder d1, thread, head d, k, socket s, preferred lengths",
   "url": "https://cdn.standards.iteh.ai/samples/14078/66d6be2c979341abb895fa52330708be/ISO-7379-1983.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "fasten.it",
   "title": "ISO 7379 Standard dimensions for hexagon socket head shoulder screws (M5 to M20): thread length b max, socket depth t min, k max",
   "url": "https://fasten.it/en/norms/norm/iso_7379",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Ganter Norm",
   "title": "ISO 7379 shoulder screws, steel, with collar: d1, d2, l1, d3, s (and the 4 / M3, 5 / M4 non-ISO sizes)",
   "url": "https://ganternorm.com/en/products/3.2-Mounting-positioning-levelling-with-screws-clamping-and-supporting-elements/Swing-bolts-Shoulder-screws-Thrust-bolts/ISO-7379-Shoulder-screws",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "SKDIN (distributor, McMaster part mirror)",
   "title": "M5 ISO 7379 shoulder screw 92981A149: 6 mm shoulder, head 10 x 5, socket 3",
   "url": "https://www.skdin.com/products/productid-0537FA00027",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "SKDIN (distributor, McMaster part mirror)",
   "title": "M10 ISO 7379 shoulder screw 90265A374: 13 mm shoulder, head 19 x 10",
   "url": "https://www.skdin.com/products/productid-0543FA00205",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Accu Components",
   "title": "M10 x 20 socket shoulder screw ISO 7379 (12 mm shoulder, 16.4 thread length, head 18 x 8.9)",
   "url": "https://accu-components.com/us/metric-socket-shoulder-screws/10490-SSH-M10-20-12-9",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Shoulder screws, ISO 7379 filter (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/shoulder-screws/specifications-met~iso-7379",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Steel shoulder screws (inch and metric) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/steel-shoulder-screws/",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
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  "tolerance_mm": null
 },
 "related": [
  "shoulder-screws-asme-b18-3",
  "socket-head-cap-screws-metric",
  "socket-head-cap-screws-metric-m10-m24",
  "clevis-pins",
  "dowel-pins-metric",
  "ball-bearings-metric"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "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": "What size is an M8 ISO 7379 shoulder screw?",
   "a": "10 mm shoulder, M8 × 1.25 thread 13.25 mm long (max), head Ø16 × 8, 5 mm hex key."
  },
  {
   "q": "What hex key fits an M6 shoulder bolt?",
   "a": "4 mm: the M6 (8 mm shoulder) ISO 7379 screw has a 4 mm hex socket and a Ø13 head."
  },
  {
   "q": "Do all sources agree on the shoulder diameter?",
   "a": "Not for M5 (6 vs 6.5), M10 (13 vs 12) and M20 (25 vs 24); the page shows both and the files use 6, 13 and 25."
  }
 ],
 "files_license": null,
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   "file": "shoulder-screw-iso-7379-m5-shoulder-6x40",
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   "stl": "https://xemstudio.com/files/hardware/shoulder-screws-iso-7379/shoulder-screw-iso-7379-m5-shoulder-6x40.stl",
   "note": "ISO 7379 shoulder screw M5: shoulder Ø6 × 40 mm long, thread M5 × 9.75 mm (drawn as a plain Ø5 cylinder, nominal major diameter), head Ø10 × 5, 3 mm hex socket 2.4 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck"
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   "note": "ISO 7379 shoulder screw M6: shoulder Ø8 × 40 mm long, thread M6 × 11.25 mm (drawn as a plain Ø6 cylinder, nominal major diameter), head Ø13 × 6, 4 mm hex socket 3.3 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck"
  },
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   "stl": "https://xemstudio.com/files/hardware/shoulder-screws-iso-7379/shoulder-screw-iso-7379-m8-shoulder-10x40.stl",
   "note": "ISO 7379 shoulder screw M8: shoulder Ø10 × 40 mm long, thread M8 × 13.25 mm (drawn as a plain Ø8 cylinder, nominal major diameter), head Ø16 × 8, 5 mm hex socket 4.2 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck"
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   "stl": "https://xemstudio.com/files/hardware/shoulder-screws-iso-7379/shoulder-screw-iso-7379-m10-shoulder-13x40.stl",
   "note": "ISO 7379 shoulder screw M10: shoulder Ø13 × 40 mm long, thread M10 × 16.4 mm (drawn as a plain Ø10 cylinder, nominal major diameter), head Ø18 × 10, 6 mm hex socket 4.9 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck"
  },
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   "note": "ISO 7379 shoulder screw M12: shoulder Ø16 × 40 mm long, thread M12 × 18.4 mm (drawn as a plain Ø12 cylinder, nominal major diameter), head Ø24 × 12, 8 mm hex socket 6.6 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck"
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   "note": "ISO 7379 shoulder screw M16: shoulder Ø20 × 40 mm long, thread M16 × 22.4 mm (drawn as a plain Ø16 cylinder, nominal major diameter), head Ø30 × 16, 10 mm hex socket 8.8 mm deep; the 40 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck"
  },
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   "note": "ISO 7379 shoulder screw M20: shoulder Ø25 × 50 mm long, thread M20 × 27.4 mm (drawn as a plain Ø20 cylinder, nominal major diameter), head Ø36 × 20, 12 mm hex socket 10 mm deep; the 50 mm shoulder length is an example from the standard's range, head height k and socket depth t are the larger/single-source values noted on the page; no chamfers or thread neck"
  }
 ],
 "markdown": "https://xemstudio.com/objects/shoulder-screws-iso-7379/index.md"
}