{
 "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": "dowel-pins-internal-thread-iso-8733",
 "name": "Dowel pins with internal thread, ISO 8733: Ø6–Ø50 extraction thread, thread depth, counterbore",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What extraction thread, thread depth and counterbore does an ISO 8733 dowel pin with internal thread have for Ø6 to Ø50?",
 "tags": [
  "iso 8733",
  "din 7979",
  "pull dowel",
  "extractable dowel pin",
  "parallel pin internal thread",
  "fixture"
 ],
 "aliases": [
  "iso 8733 dimensions",
  "extractable dowel pin 10 mm thread",
  "pull dowel m6 thread depth",
  "dowel pin with tapped hole",
  "iso 8735 dowel"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 10,
 "url": "https://xemstudio.com/objects/dowel-pins-internal-thread-iso-8733/",
 "sheet_txt": "https://xemstudio.com/objects/dowel-pins-internal-thread-iso-8733/sheet.txt",
 "sheet": {
  "basis": "Westfield Fasteners' ISO 8733 table (d1, c1, c2, d2, P, d3, t1, t2, t3), cross-checked against OPAC's ISO 8733 table",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Columns: pin diameter d1, thread d2, counterbore d3, thread depth t1, counterbore depth t3, drawn length l. Hardened pins to ISO 8735 use the same d2 per diameter.",
   "One representative length per diameter is drawn; other lengths change l only. End chamfers c1/c2 (≈ values) are not drawn."
  ],
  "table": {
   "columns": [
    "d1",
    "thread",
    "d3",
    "t1",
    "t3",
    "l drawn"
   ],
   "rows": [
    [
     "6",
     "M4",
     "4.3",
     "6",
     "1",
     "20"
    ],
    [
     "8",
     "M5",
     "5.3",
     "8",
     "1.2",
     "25"
    ],
    [
     "10",
     "M6",
     "6.4",
     "10",
     "1.2",
     "30"
    ],
    [
     "12",
     "M6",
     "6.4",
     "12",
     "1.2",
     "30"
    ],
    [
     "16",
     "M8",
     "8.4",
     "16",
     "1.5",
     "40"
    ],
    [
     "20",
     "M10",
     "10.5",
     "18",
     "1.5",
     "50"
    ],
    [
     "25",
     "M16",
     "17",
     "24",
     "2",
     "60"
    ],
    [
     "30",
     "M20",
     "21",
     "30",
     "2",
     "80"
    ],
    [
     "40",
     "M20",
     "21",
     "30",
     "2.5",
     "100"
    ],
    [
     "50",
     "M24",
     "25",
     "36",
     "2.5",
     "120"
    ]
   ]
  }
 },
 "sheet_text": "Dowel pins with internal thread, ISO 8733: Ø6–Ø50 extraction thread, thread depth, counterbore — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/dowel-pins-internal-thread-iso-8733/  (sheet CC BY 4.0)\nBasis: Westfield Fasteners' ISO 8733 table (d1, c1, c2, d2, P, d3, t1, t2, t3), cross-checked against OPAC's ISO 8733 table\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Columns: pin diameter d1, thread d2, counterbore d3, thread depth t1, counterbore depth t3, drawn length l. Hardened pins to ISO 8735 use the same d2 per diameter.\n- One representative length per diameter is drawn; other lengths change l only. End chamfers c1/c2 (≈ values) are not drawn.\n\nd1  thread  d3  t1  t3  l drawn\n6  M4  4.3  6  1  20\n8  M5  5.3  8  1.2  25\n10  M6  6.4  10  1.2  30\n12  M6  6.4  12  1.2  30\n16  M8  8.4  16  1.5  40\n20  M10  10.5  18  1.5  50\n25  M16  17  24  2  60\n30  M20  21  30  2  80\n40  M20  21  30  2.5  100\n50  M24  25  36  2.5  120\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Westfield Fasteners: ISO 8733 extractable dowel pin: d1, c1, c2, d2, P, d3, t1, t2, t3 — web — Publisher's page; dimensions are facts — https://www.westfieldfasteners.co.uk/Standards/Pin-ExtDowel.html\n- OPAC: ISO 8733 table — web — Publisher's page; dimensions are facts — https://www.opac.net/en/producto-170-iso-8733\n- ISO (iTeh preview): ISO 8735:1997 Table 1, hardened pins with internal thread — web — Publisher's page; dimensions are facts — https://cdn.standards.iteh.ai/samples/21794/5336932a636449df82213642fd4cdca8/ISO-8735-1997.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 10 parts): https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/index.json\nAPI: https://xemstudio.com/api/geometry?object=dowel-pins-internal-thread-iso-8733\n",
 "sources": [
  {
   "publisher": "Westfield Fasteners",
   "title": "ISO 8733 extractable dowel pin: d1, c1, c2, d2, P, d3, t1, t2, t3",
   "url": "https://www.westfieldfasteners.co.uk/Standards/Pin-ExtDowel.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "OPAC",
   "title": "ISO 8733 table",
   "url": "https://www.opac.net/en/producto-170-iso-8733",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ISO (iTeh preview)",
   "title": "ISO 8735:1997 Table 1, hardened pins with internal thread",
   "url": "https://cdn.standards.iteh.ai/samples/21794/5336932a636449df82213642fd4cdca8/ISO-8735-1997.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "dowel-pins-iso-2338-8734",
  "dowel-pins-metric",
  "spring-pins-iso-8752-8750-asme-b18-8-2"
 ],
 "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": [
  {
   "feature": "pin",
   "exact": "d1 (m6): Ø6 to Ø50",
   "mates": "reamed hole H7 of the same Ø",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "extraction thread",
   "exact": "d2 × t1: M4 × 6 (Ø6) to M24 × 36 (Ø50); Ø10 M6 × 10",
   "mates": "extraction screw or slide hammer",
   "fit": "designed",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.",
  "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "What thread is in a 10 mm pull dowel?",
   "a": "ISO 8733 Ø10: M6, 10 mm deep, with a Ø6.4 × 1.2 mm counterbore."
  },
  {
   "q": "Which pins have the same extraction thread?",
   "a": "Hardened ISO 8735 pins use the same thread per diameter (M4 for Ø6 up to M24 for Ø50)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "iso8733-6x20",
   "formats": [
    "step",
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   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-6x20.step",
   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-6x20.stl",
   "note": "ISO 8733 6×20: M4 to depth 6, counterbore Ø4.3×1"
  },
  {
   "file": "iso8733-8x25",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-8x25.step",
   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-8x25.stl",
   "note": "ISO 8733 8×25: M5 to depth 8, counterbore Ø5.3×1.2"
  },
  {
   "file": "iso8733-10x30",
   "formats": [
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   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-10x30.stl",
   "note": "ISO 8733 10×30: M6 to depth 10, counterbore Ø6.4×1.2"
  },
  {
   "file": "iso8733-12x30",
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   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-12x30.stl",
   "note": "ISO 8733 12×30: M6 to depth 12, counterbore Ø6.4×1.2"
  },
  {
   "file": "iso8733-16x40",
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   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-16x40.stl",
   "note": "ISO 8733 16×40: M8 to depth 16, counterbore Ø8.4×1.5"
  },
  {
   "file": "iso8733-20x50",
   "formats": [
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   "step": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-20x50.step",
   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-20x50.stl",
   "note": "ISO 8733 20×50: M10 to depth 18, counterbore Ø10.5×1.5"
  },
  {
   "file": "iso8733-25x60",
   "formats": [
    "step",
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   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-25x60.stl",
   "note": "ISO 8733 25×60: M16 to depth 24, counterbore Ø17×2"
  },
  {
   "file": "iso8733-30x80",
   "formats": [
    "step",
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   "step": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-30x80.step",
   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-30x80.stl",
   "note": "ISO 8733 30×80: M20 to depth 30, counterbore Ø21×2"
  },
  {
   "file": "iso8733-40x100",
   "formats": [
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   "price_usd": 0,
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   "step": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-40x100.step",
   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-40x100.stl",
   "note": "ISO 8733 40×100: M20 to depth 30, counterbore Ø21×2.5"
  },
  {
   "file": "iso8733-50x120",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
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   "stl": "https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/iso8733-50x120.stl",
   "note": "ISO 8733 50×120: M24 to depth 36, counterbore Ø25×2.5"
  }
 ],
 "markdown": "https://xemstudio.com/objects/dowel-pins-internal-thread-iso-8733/index.md"
}