{
 "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": "button-head-screws-metric",
 "name": "Button head socket screws, M2–M8 (ISO 7380)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "How big is an M3 button head screw head?",
 "tags": [
  "screw",
  "fastener",
  "button head",
  "dome head"
 ],
 "aliases": [
  "m3 button head",
  "iso 7380",
  "button screw",
  "dome screw"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 35,
 "url": "https://xemstudio.com/objects/button-head-screws-metric/",
 "sheet_txt": "https://xemstudio.com/objects/button-head-screws-metric/sheet.txt",
 "sheet": {
  "basis": "ISO 7380-1",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Low domed head for appearance; no counterbore needed. Head diameter ≈ 1.9 × thread, head height ≈ 0.55 × thread.",
   "Smaller hex than a cap screw of the same thread (M3 uses 2 mm, M6 uses 4 mm), so torque lower; fine for plastic parts."
  ],
  "table": {
   "columns": [
    "thread",
    "head_dia_mm",
    "head_height_mm",
    "hex_key_mm"
   ],
   "rows": [
    [
     "M2",
     3.5,
     1.3,
     1.3
    ],
    [
     "M2.5",
     4.7,
     1.5,
     1.5
    ],
    [
     "M3",
     5.7,
     1.65,
     2
    ],
    [
     "M4",
     7.6,
     2.2,
     2.5
    ],
    [
     "M5",
     9.5,
     2.75,
     3
    ],
    [
     "M6",
     10.5,
     3.3,
     4
    ],
    [
     "M8",
     14,
     4.4,
     5
    ]
   ]
  }
 },
 "sheet_text": "Button head socket screws, M2–M8 (ISO 7380) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/button-head-screws-metric/  (CC BY 4.0)\nBasis: ISO 7380-1\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Low domed head for appearance; no counterbore needed. Head diameter ≈ 1.9 × thread, head height ≈ 0.55 × thread.\n- Smaller hex than a cap screw of the same thread (M3 uses 2 mm, M6 uses 4 mm), so torque lower; fine for plastic parts.\n\nthread  head_dia_mm  head_height_mm  hex_key_mm\nM2  3.5  1.3  1.3\nM2.5  4.7  1.5  1.5\nM3  5.7  1.65  2.0\nM4  7.6  2.2  2.5\nM5  9.5  2.75  3.0\nM6  10.5  3.3  4.0\nM8  14.0  4.4  5.0\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- McMaster-Carr: Socket head screws (free STEP/IGES/STL per part, for your own design use; no redistribution) — STEP, IGES, STL, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/socket-head-screws/\n- Wikipedia: Screw — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Screw\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 35 parts): https://xemstudio.com/files/hardware/button-head-screws-metric/index.json\nAPI: https://xemstudio.com/api/geometry?object=button-head-screws-metric\n",
 "sources": [
  {
   "publisher": "McMaster-Carr",
   "title": "Socket head screws (free STEP/IGES/STL per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/socket-head-screws/",
   "formats": [
    "STEP",
    "IGES",
    "STL",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Screw",
   "url": "https://en.wikipedia.org/wiki/Screw",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "socket-head-cap-screws-metric",
  "countersunk-screws-metric",
  "2020-extrusion",
  "flat-washers-metric"
 ],
 "faq": [
  {
   "q": "What size is an M3 button head screw head?",
   "a": "5.7 mm diameter, 1.65 mm tall, 2 mm hex key (ISO 7380). Clearance hole 3.4 mm, or 3.6 in a print."
  },
  {
   "q": "What size is an M5 button head screw head?",
   "a": "9.5 mm diameter, 2.75 mm tall, 3 mm hex key. 2020 extrusion T-nut screws are usually M5 button heads 8–10 mm long."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "button-m2x4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2x4.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2x4.stl",
   "note": "ISO 7380 M2 × 4, thread as plain cylinder"
  },
  {
   "file": "button-m2x6",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2x6.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2x6.stl",
   "note": "ISO 7380 M2 × 6, thread as plain cylinder"
  },
  {
   "file": "button-m2x8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2x8.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2x8.stl",
   "note": "ISO 7380 M2 × 8, thread as plain cylinder"
  },
  {
   "file": "button-m2x10",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2x10.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2x10.stl",
   "note": "ISO 7380 M2 × 10, thread as plain cylinder"
  },
  {
   "file": "button-m2.5x6",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2.5x6.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2.5x6.stl",
   "note": "ISO 7380 M2.5 × 6, thread as plain cylinder"
  },
  {
   "file": "button-m2.5x8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2.5x8.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2.5x8.stl",
   "note": "ISO 7380 M2.5 × 8, thread as plain cylinder"
  },
  {
   "file": "button-m2.5x10",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2.5x10.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2.5x10.stl",
   "note": "ISO 7380 M2.5 × 10, thread as plain cylinder"
  },
  {
   "file": "button-m2.5x12",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2.5x12.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m2.5x12.stl",
   "note": "ISO 7380 M2.5 × 12, thread as plain cylinder"
  },
  {
   "file": "button-m3x6",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x6.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x6.stl",
   "note": "ISO 7380 M3 × 6, thread as plain cylinder"
  },
  {
   "file": "button-m3x8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x8.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x8.stl",
   "note": "ISO 7380 M3 × 8, thread as plain cylinder"
  },
  {
   "file": "button-m3x10",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x10.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x10.stl",
   "note": "ISO 7380 M3 × 10, thread as plain cylinder"
  },
  {
   "file": "button-m3x12",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x12.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x12.stl",
   "note": "ISO 7380 M3 × 12, thread as plain cylinder"
  },
  {
   "file": "button-m3x16",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x16.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x16.stl",
   "note": "ISO 7380 M3 × 16, thread as plain cylinder"
  },
  {
   "file": "button-m3x20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x20.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m3x20.stl",
   "note": "ISO 7380 M3 × 20, thread as plain cylinder"
  },
  {
   "file": "button-m4x8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x8.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x8.stl",
   "note": "ISO 7380 M4 × 8, thread as plain cylinder"
  },
  {
   "file": "button-m4x10",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x10.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x10.stl",
   "note": "ISO 7380 M4 × 10, thread as plain cylinder"
  },
  {
   "file": "button-m4x12",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x12.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x12.stl",
   "note": "ISO 7380 M4 × 12, thread as plain cylinder"
  },
  {
   "file": "button-m4x16",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x16.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x16.stl",
   "note": "ISO 7380 M4 × 16, thread as plain cylinder"
  },
  {
   "file": "button-m4x20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x20.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x20.stl",
   "note": "ISO 7380 M4 × 20, thread as plain cylinder"
  },
  {
   "file": "button-m4x25",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x25.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m4x25.stl",
   "note": "ISO 7380 M4 × 25, thread as plain cylinder"
  },
  {
   "file": "button-m5x10",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x10.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x10.stl",
   "note": "ISO 7380 M5 × 10, thread as plain cylinder"
  },
  {
   "file": "button-m5x12",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x12.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x12.stl",
   "note": "ISO 7380 M5 × 12, thread as plain cylinder"
  },
  {
   "file": "button-m5x16",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x16.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x16.stl",
   "note": "ISO 7380 M5 × 16, thread as plain cylinder"
  },
  {
   "file": "button-m5x20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x20.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x20.stl",
   "note": "ISO 7380 M5 × 20, thread as plain cylinder"
  },
  {
   "file": "button-m5x25",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x25.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m5x25.stl",
   "note": "ISO 7380 M5 × 25, thread as plain cylinder"
  },
  {
   "file": "button-m6x12",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x12.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x12.stl",
   "note": "ISO 7380 M6 × 12, thread as plain cylinder"
  },
  {
   "file": "button-m6x16",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x16.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x16.stl",
   "note": "ISO 7380 M6 × 16, thread as plain cylinder"
  },
  {
   "file": "button-m6x20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x20.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x20.stl",
   "note": "ISO 7380 M6 × 20, thread as plain cylinder"
  },
  {
   "file": "button-m6x25",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x25.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x25.stl",
   "note": "ISO 7380 M6 × 25, thread as plain cylinder"
  },
  {
   "file": "button-m6x30",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x30.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m6x30.stl",
   "note": "ISO 7380 M6 × 30, thread as plain cylinder"
  },
  {
   "file": "button-m8x16",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x16.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x16.stl",
   "note": "ISO 7380 M8 × 16, thread as plain cylinder"
  },
  {
   "file": "button-m8x20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x20.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x20.stl",
   "note": "ISO 7380 M8 × 20, thread as plain cylinder"
  },
  {
   "file": "button-m8x25",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x25.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x25.stl",
   "note": "ISO 7380 M8 × 25, thread as plain cylinder"
  },
  {
   "file": "button-m8x30",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x30.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x30.stl",
   "note": "ISO 7380 M8 × 30, thread as plain cylinder"
  },
  {
   "file": "button-m8x40",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x40.step",
   "stl": "https://xemstudio.com/files/hardware/button-head-screws-metric/button-m8x40.stl",
   "note": "ISO 7380 M8 × 40, thread as plain cylinder"
  }
 ],
 "markdown": "https://xemstudio.com/objects/button-head-screws-metric/index.md"
}