{
 "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": "countersunk-screws-metric",
 "name": "Countersunk socket screws, M2–M8 (ISO 10642 / DIN 7991)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What countersink does an M3 flat head screw need?",
 "tags": [
  "screw",
  "fastener",
  "countersunk",
  "flat head",
  "countersink"
 ],
 "aliases": [
  "m3 countersunk",
  "flat head screw",
  "din 7991",
  "iso 10642",
  "csk 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/countersunk-screws-metric/",
 "sheet_txt": "https://xemstudio.com/objects/countersunk-screws-metric/sheet.txt",
 "sheet": {
  "basis": "ISO 10642 / DIN 7991 (actual head diameter, 90° countersink)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Head sits flush in a 90° countersink. Countersink diameter = head diameter + 0.3 mm; depth = head height. In a print, add 0.2 mm to the diameter.",
   "Head height is about 0.55 × thread. Minimum material under the head on a printed part: 1.5 mm or it pulls through."
  ],
  "table": {
   "columns": [
    "thread",
    "head_dia_mm",
    "head_height_mm",
    "hex_key_mm",
    "csk_dia_in_print_mm"
   ],
   "rows": [
    [
     "M2",
     4.4,
     1.2,
     1.3,
     4.9
    ],
    [
     "M2.5",
     5.5,
     1.5,
     1.5,
     6
    ],
    [
     "M3",
     6,
     1.7,
     2,
     6.5
    ],
    [
     "M4",
     8,
     2.3,
     2.5,
     8.5
    ],
    [
     "M5",
     10,
     2.8,
     3,
     10.5
    ],
    [
     "M6",
     12,
     3.3,
     4,
     12.5
    ],
    [
     "M8",
     16,
     4.4,
     5,
     16.5
    ]
   ]
  }
 },
 "sheet_text": "Countersunk socket screws, M2–M8 (ISO 10642 / DIN 7991) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/countersunk-screws-metric/  (CC BY 4.0)\nBasis: ISO 10642 / DIN 7991 (actual head diameter, 90° countersink)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Head sits flush in a 90° countersink. Countersink diameter = head diameter + 0.3 mm; depth = head height. In a print, add 0.2 mm to the diameter.\n- Head height is about 0.55 × thread. Minimum material under the head on a printed part: 1.5 mm or it pulls through.\n\nthread  head_dia_mm  head_height_mm  hex_key_mm  csk_dia_in_print_mm\nM2  4.4  1.2  1.3  4.9\nM2.5  5.5  1.5  1.5  6.0\nM3  6.0  1.7  2.0  6.5\nM4  8.0  2.3  2.5  8.5\nM5  10.0  2.8  3.0  10.5\nM6  12.0  3.3  4.0  12.5\nM8  16.0  4.4  5.0  16.5\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/countersunk-screws-metric/index.json\nAPI: https://xemstudio.com/api/geometry?object=countersunk-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
  }
 ],
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  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "socket-head-cap-screws-metric",
  "button-head-screws-metric",
  "hex-nuts-metric",
  "heat-set-inserts"
 ],
 "faq": [
  {
   "q": "What countersink for an M3 flat head screw?",
   "a": "90° cone, 6.3 mm diameter at the surface, 1.7 mm deep (6.0 mm head). In a print model 6.5 mm."
  },
  {
   "q": "What countersink for M4 and M5 flat head screws?",
   "a": "M4: 8.3 mm diameter × 2.3 mm deep. M5: 10.3 mm × 2.8 mm. Always 90° for metric (82° is the imperial standard, not interchangeable)."
  },
  {
   "q": "Can I countersink a 3D printed part?",
   "a": "Yes if there's 1.5 mm or more of material under the head and the cone is modeled, not drilled; printed cones come out clean when the part is oriented with the cone opening downward or the overhang is under 45°."
  }
 ],
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   "stl": "https://xemstudio.com/files/hardware/countersunk-screws-metric/csk-m8x30.stl",
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   "note": "ISO 10642 M8 × 40, 90° head, thread as plain cylinder"
  }
 ],
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}