{
 "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": "grooved-pins-iso-8739-8747",
 "name": "Grooved pins ISO 8739–8747 (groove pins): types, nominal diameter 1.5–25, a, chamfer c, expanded diameter, double shear, hole class",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What types of grooved pin exist (ISO 8739 to 8747), what hole do they need and what are their sizes and shear loads?",
 "tags": [
  "grooved pin",
  "groove pin",
  "iso 8740",
  "iso 8739",
  "iso 8741",
  "iso 8744",
  "iso 8745",
  "din 1471",
  "din 1473",
  "fastener",
  "tool"
 ],
 "aliases": [
  "grooved pin hole size",
  "iso 8740 grooved pin dimensions",
  "groove pin types",
  "groove pin vs roll pin",
  "iso 8739 grooved pin",
  "grooved pin 6 mm hole h11",
  "iso 8741 reverse taper grooved pin",
  "grooved pin double shear force kn",
  "full length parallel groove pin",
  "half length taper groove pin",
  "din 1473 grooved pin",
  "grooved pin chamfer c1 c2"
 ],
 "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/grooved-pins-iso-8739-8747/",
 "sheet_txt": "https://xemstudio.com/objects/grooved-pins-iso-8739-8747/sheet.txt",
 "sheet": {
  "basis": "fasten.it's ISO 8740 table (d, expanded diameter, c1, c2, a), iTeh's ISO 8739:1997 sample pages (a, double shear, hole class H11; its numbers agree with fasten.it's where both print them), GB/T 13829.2 as a cross-check of the shear values, ISO's own list of titles; numbers only",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Grooved pins (groove pins) have three grooves along the pin, pressed so the displaced metal grips the hole. ISO's titles (ICS 21.060.50 list; all 1986 and 1997 editions are marked withdrawn there, with 2025 editions of ISO 8740 and ISO 8741 on iTeh): ISO 8739 - Full-length parallel grooved, with pilot; ISO 8740 - Full-length parallel grooved, with chamfer; ISO 8741 - Half-length reverse-taper grooved; ISO 8742 - One-third-length centre grooved (1986 title: third-length centre grooved); ISO 8743 - Half-length centre grooved; ISO 8744 - Full-length taper grooved; ISO 8745 - Half-length taper grooved; ISO 8746 - Grooved pins with round head; ISO 8747 - Grooved pins with countersunk head. The groove form is the difference between the types: parallel or taper grooves, full, half or one-third length, centre or end.",
   "Table columns (mm unless noted): d nominal, the expanded diameter fasten.it prints under the header 'd1 expanded diameter for all lengths', c1, c2 and a ('approx.' in iTeh's ISO 8739 sample), and the minimum double-shear force in kN. fasten.it's table is for ISO 8740 (full-length parallel grooved, with chamfer), d 1.5 to 25 mm; its c1 and c2 are not defined in the text (the drawing is an image). a approx. in iTeh's ISO 8739 sample agrees with fasten.it's a for all 13 sizes; the double-shear values in iTeh's ISO 8739 sample are the same list as GB/T 13829.2's (Global Fastener) for the half-length reverse-taper type, so they are shown once; whether the standards share these shear values by type was not verified beyond those two. ISO 8739's c max / min (2 to 7 and 1 to 6 mm) are a different quantity and not tabulated.",
   "Hole: the mating hole diameter equals the nominal pin diameter d, tolerance class H11 (clause 4 of ISO 8739:1997, iTeh OCR). The 2025 text of ISO 8740 and ISO 8741 says hole dimensions and the expanded diameter d2 are in ISO 13669 and that the angle between two grooves is 120° ±20° with the 70° groove angle a reference (iTeh's 2025 samples; the tables are not in the samples). Steel pins are 125 to 245 HV30 and A1 stainless 210 to 280 HV30 (ISO 8739 sample). The expanded-diameter table in the ISO 8739 sample is keyed by pin length and its column alignment did not survive the text extraction, so it is not tabulated; its values (2.15, 2.65, 3.2, 4.25, 5.25, 6.3, 8.3, 10.35, 12.35, 16.4, 20.5, 25.5) are the same list as fasten.it's expanded diameters.",
   "Not read or not shown: the 2025 table values of ISO 8740 to 8745, the length range per diameter (the matrix was lost in the extraction), and the DIN 1471 to 1476 and ASME B18.8.2 grooved-pin tables (opac.net's DIN 1470 sheet prints a and c per d with a slightly different 5 mm value, c 0.6 against 0.63 here, so those sheets are not mixed in). No file: the groove form and the expanded profile are not published as numbers in the sources read. ISO 8741's 2025 text says its pins have rounded ends by default and chamfered ends by agreement."
  ],
  "table": {
   "columns": [
    "d nominal (mm)",
    "expanded diameter, fasten.it 'd1' (mm)",
    "c1 (mm)",
    "c2 (mm)",
    "a approx. (mm)",
    "min double shear (kN)",
    "hole (mm)"
   ],
   "rows": [
    [
     "1.5",
     "1.6",
     "0.12",
     "0.6",
     "0.2",
     "1.6",
     "1.5 (H11)"
    ],
    [
     "2",
     "2.15",
     "0.18",
     "0.8",
     "0.25",
     "2.84",
     "2 (H11)"
    ],
    [
     "2.5",
     "2.65",
     "0.25",
     "1",
     "0.3",
     "4.4",
     "2.5 (H11)"
    ],
    [
     "3",
     "3.2",
     "0.3",
     "1.2",
     "0.4",
     "6.4",
     "3 (H11)"
    ],
    [
     "4",
     "4.25",
     "0.4",
     "1.4",
     "0.5",
     "11.3",
     "4 (H11)"
    ],
    [
     "5",
     "5.25",
     "0.5",
     "1.7",
     "0.63",
     "17.6",
     "5 (H11)"
    ],
    [
     "6",
     "6.3",
     "0.6",
     "2.1",
     "0.8",
     "25.4",
     "6 (H11)"
    ],
    [
     "8",
     "8.3",
     "0.8",
     "2.6",
     "1",
     "45.2",
     "8 (H11)"
    ],
    [
     "10",
     "10.35",
     "1",
     "3",
     "1.2",
     "70.4",
     "10 (H11)"
    ],
    [
     "12",
     "12.35",
     "1.2",
     "3.8",
     "1.6",
     "101.8",
     "12 (H11)"
    ],
    [
     "16",
     "16.4",
     "1.6",
     "4.6",
     "2",
     "181",
     "16 (H11)"
    ],
    [
     "20",
     "20.5",
     "2",
     "6",
     "2.5",
     "283",
     "20 (H11)"
    ],
    [
     "25",
     "25.5",
     "2.5",
     "7.5",
     "3",
     "444",
     "25 (H11)"
    ]
   ]
  }
 },
 "sheet_text": "Grooved pins ISO 8739–8747 (groove pins): types, nominal diameter 1.5–25, a, chamfer c, expanded diameter, double shear, hole class — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/grooved-pins-iso-8739-8747/  (sheet CC BY 4.0)\nBasis: fasten.it's ISO 8740 table (d, expanded diameter, c1, c2, a), iTeh's ISO 8739:1997 sample pages (a, double shear, hole class H11; its numbers agree with fasten.it's where both print them), GB/T 13829.2 as a cross-check of the shear values, ISO's own list of titles; numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Grooved pins (groove pins) have three grooves along the pin, pressed so the displaced metal grips the hole. ISO's titles (ICS 21.060.50 list; all 1986 and 1997 editions are marked withdrawn there, with 2025 editions of ISO 8740 and ISO 8741 on iTeh): ISO 8739 - Full-length parallel grooved, with pilot; ISO 8740 - Full-length parallel grooved, with chamfer; ISO 8741 - Half-length reverse-taper grooved; ISO 8742 - One-third-length centre grooved (1986 title: third-length centre grooved); ISO 8743 - Half-length centre grooved; ISO 8744 - Full-length taper grooved; ISO 8745 - Half-length taper grooved; ISO 8746 - Grooved pins with round head; ISO 8747 - Grooved pins with countersunk head. The groove form is the difference between the types: parallel or taper grooves, full, half or one-third length, centre or end.\n- Table columns (mm unless noted): d nominal, the expanded diameter fasten.it prints under the header 'd1 expanded diameter for all lengths', c1, c2 and a ('approx.' in iTeh's ISO 8739 sample), and the minimum double-shear force in kN. fasten.it's table is for ISO 8740 (full-length parallel grooved, with chamfer), d 1.5 to 25 mm; its c1 and c2 are not defined in the text (the drawing is an image). a approx. in iTeh's ISO 8739 sample agrees with fasten.it's a for all 13 sizes; the double-shear values in iTeh's ISO 8739 sample are the same list as GB/T 13829.2's (Global Fastener) for the half-length reverse-taper type, so they are shown once; whether the standards share these shear values by type was not verified beyond those two. ISO 8739's c max / min (2 to 7 and 1 to 6 mm) are a different quantity and not tabulated.\n- Hole: the mating hole diameter equals the nominal pin diameter d, tolerance class H11 (clause 4 of ISO 8739:1997, iTeh OCR). The 2025 text of ISO 8740 and ISO 8741 says hole dimensions and the expanded diameter d2 are in ISO 13669 and that the angle between two grooves is 120° ±20° with the 70° groove angle a reference (iTeh's 2025 samples; the tables are not in the samples). Steel pins are 125 to 245 HV30 and A1 stainless 210 to 280 HV30 (ISO 8739 sample). The expanded-diameter table in the ISO 8739 sample is keyed by pin length and its column alignment did not survive the text extraction, so it is not tabulated; its values (2.15, 2.65, 3.2, 4.25, 5.25, 6.3, 8.3, 10.35, 12.35, 16.4, 20.5, 25.5) are the same list as fasten.it's expanded diameters.\n- Not read or not shown: the 2025 table values of ISO 8740 to 8745, the length range per diameter (the matrix was lost in the extraction), and the DIN 1471 to 1476 and ASME B18.8.2 grooved-pin tables (opac.net's DIN 1470 sheet prints a and c per d with a slightly different 5 mm value, c 0.6 against 0.63 here, so those sheets are not mixed in). No file: the groove form and the expanded profile are not published as numbers in the sources read. ISO 8741's 2025 text says its pins have rounded ends by default and chamfered ends by agreement.\n\nd nominal (mm)  expanded diameter, fasten.it 'd1' (mm)  c1 (mm)  c2 (mm)  a approx. (mm)  min double shear (kN)  hole (mm)\n1.5  1.6  0.12  0.6  0.2  1.6  1.5 (H11)\n2  2.15  0.18  0.8  0.25  2.84  2 (H11)\n2.5  2.65  0.25  1  0.3  4.4  2.5 (H11)\n3  3.2  0.3  1.2  0.4  6.4  3 (H11)\n4  4.25  0.4  1.4  0.5  11.3  4 (H11)\n5  5.25  0.5  1.7  0.63  17.6  5 (H11)\n6  6.3  0.6  2.1  0.8  25.4  6 (H11)\n8  8.3  0.8  2.6  1  45.2  8 (H11)\n10  10.35  1  3  1.2  70.4  10 (H11)\n12  12.35  1.2  3.8  1.6  101.8  12 (H11)\n16  16.4  1.6  4.6  2  181  16 (H11)\n20  20.5  2  6  2.5  283  20 (H11)\n25  25.5  2.5  7.5  3  444  25 (H11)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- fasten.it: DIN EN ISO 8740 grooved pins, full-length parallel grooved, with chamfer, d 1.5 to 25: d, expanded diameter, c1, c2, a (table; the drawing is an image) — web — Reference page; numbers only — https://fasten.it/norms/norm/din_en_iso_8740\n- iTeh Standards: ISO 8739:1997 sample pages: c max / min, a approx., minimum double-shear force, expanded diameter table, hole class H11, hardness (OCR; column alignment flagged) — web — Standards-body sample pages; numbers only — https://cdn.standards.iteh.ai/samples/20003/6b7047cee06347469a07d58056a002b2/ISO-8739-1997.pdf\n- iTeh Standards: ISO 8741:2025 sample pages (scope, groove angle 70° ref., grooves 120° ±20°, rounded ends); the tables are not in the sample — web — Standards-body sample pages; text only — https://cdn.standards.iteh.ai/samples/84096/6a46854e51c445128687918bac325164/ISO-8741-2025.pdf\n- Global Fastener: GB/T 13829.2-1992 grooved pins, half-length reverse-taper grooved: d1 max / min, c approx., minimum double shear, nominal lengths 8 to 200 (the Chinese standard of the ISO 8741 type; cross-check) — web — Reference page; numbers only — https://www.globalfastener.com/standards/detail_2380.html\n- ISO: ICS 21.060.50 (pins, nails and similar): exact titles of ISO 8739 to 8747, 1234, 2338 to 2341, 8733 to 8735, 8750, 8752, 13337 — web — Standard body catalogue page — https://www.iso.org/ics/21.060.50.html\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=grooved-pins-iso-8739-8747\n",
 "sources": [
  {
   "publisher": "fasten.it",
   "title": "DIN EN ISO 8740 grooved pins, full-length parallel grooved, with chamfer, d 1.5 to 25: d, expanded diameter, c1, c2, a (table; the drawing is an image)",
   "url": "https://fasten.it/norms/norm/din_en_iso_8740",
   "formats": [
    "web"
   ],
   "license": "Reference page; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "iTeh Standards",
   "title": "ISO 8739:1997 sample pages: c max / min, a approx., minimum double-shear force, expanded diameter table, hole class H11, hardness (OCR; column alignment flagged)",
   "url": "https://cdn.standards.iteh.ai/samples/20003/6b7047cee06347469a07d58056a002b2/ISO-8739-1997.pdf",
   "formats": [
    "web"
   ],
   "license": "Standards-body sample pages; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "iTeh Standards",
   "title": "ISO 8741:2025 sample pages (scope, groove angle 70° ref., grooves 120° ±20°, rounded ends); the tables are not in the sample",
   "url": "https://cdn.standards.iteh.ai/samples/84096/6a46854e51c445128687918bac325164/ISO-8741-2025.pdf",
   "formats": [
    "web"
   ],
   "license": "Standards-body sample pages; text only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Global Fastener",
   "title": "GB/T 13829.2-1992 grooved pins, half-length reverse-taper grooved: d1 max / min, c approx., minimum double shear, nominal lengths 8 to 200 (the Chinese standard of the ISO 8741 type; cross-check)",
   "url": "https://www.globalfastener.com/standards/detail_2380.html",
   "formats": [
    "web"
   ],
   "license": "Reference page; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ISO",
   "title": "ICS 21.060.50 (pins, nails and similar): exact titles of ISO 8739 to 8747, 1234, 2338 to 2341, 8733 to 8735, 8750, 8752, 13337",
   "url": "https://www.iso.org/ics/21.060.50.html",
   "formats": [
    "web"
   ],
   "license": "Standard body catalogue page",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "spring-pins-iso-8752-8750-asme-b18-8-2",
  "dowel-pins-iso-2338-8734",
  "taper-pins-iso-2339-ansi-b18-8-2",
  "split-pins-iso-1234",
  "clevis-pins"
 ],
 "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": "hole for the pin",
   "exact": "Ø = nominal d, class H11 (ISO 8739:1997 clause 4): 3 → Ø3, 6 → Ø6, 10 → Ø10; the pin expands to Ø3.2, 6.3, 10.35 (fasten.it, ISO 8740 table)",
   "mates": "drilled or reamed hole in the part; the pin presses into it",
   "fit": "press",
   "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 hole for a 6 mm grooved pin?",
   "a": "Hole Ø6 with tolerance class H11: the nominal pin diameter (ISO 8739:1997, clause 4). The expanded pin is Ø6.3 (fasten.it's ISO 8740 table)."
  },
  {
   "q": "What is the double shear of a 6 mm grooved pin?",
   "a": "25.4 kN minimum in ISO 8739's table (iTeh sample) and GB/T 13829.2."
  },
  {
   "q": "What is the difference between ISO 8740 and ISO 8744?",
   "a": "ISO 8740 is full-length parallel grooved with a chamfer; ISO 8744 is full-length taper grooved (ISO's titles)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/grooved-pins-iso-8739-8747/index.md"
}