{
 "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": "t-slot-extrusions",
 "name": "Aluminium T-slot extrusion: 2020, 2040, 2060, 2080, V-slot, 3030, 3060, 4040, 4080, 1010, 1515",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "What are the slot dimensions of 2020, 3030 and 4040 aluminium extrusion?",
 "tags": [
  "extrusion",
  "t-slot",
  "aluminium",
  "frame",
  "2020",
  "v-slot",
  "8020",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "2020 extrusion dimensions",
  "3030 extrusion slot size",
  "4040 extrusion dimensions",
  "v-slot 2020",
  "8020 1010 dimensions",
  "t slot aluminium profile",
  "2040 extrusion",
  "extrusion stl"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 16,
 "url": "https://xemstudio.com/objects/t-slot-extrusions/",
 "sheet_txt": "https://xemstudio.com/objects/t-slot-extrusions/sheet.txt",
 "sheet": {
  "basis": "Common European / Misumi 20-, 30- and 40-series profiles (6 and 8 mm slots), OpenBuilds V-slot, and 80/20 10- and 15-series inch profiles; cavity dimensions typical of the 'standard' (non-light) profile, ±0.3 mm by maker",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "20-series (2020, 2040…): 20 mm pitch, 6.0 mm slot opening, ~11 mm wide slot cavity behind 1.8 mm lips, 6 mm deep, Ø4.2 centre bore (tap M5). V-slot is the same with 6.2 mm opening and 45° chamfered lips for Delrin wheels. 30-series: 8 mm slot, Ø6.8 bore (M8). 40-series: 8 mm slot (10 mm on heavy), Ø6.8–8.5 bore. 80/20 10-series: 1 in, 0.256 in (6.5 mm) slot, 0.2 in bore (1/4-20); 15-series: 1.5 in, 0.32 in (8.2 mm) slot, 0.26 in bore (5/16-18).",
   "Print the profile to check brackets before cutting aluminium: 100 mm stubs here. Printed extrusion is not structural, but a printed 2020 stub with slide-in nuts is exactly how to prototype a mount.",
   "Design rule for attachments: anything that touches the extrusion face is flat; anything in the slot is 5.8 mm wide (6 mm slot) or 7.8 mm (8 mm slot) and no deeper than the lip + 0.5 mm unless it is a nut. Tongues on brackets stop rotation. M5 button heads on 20-series, M8 on 40-series.",
   "LES: the engine test stands and the generator rigs are 2020 and 2040 frames with the printed brackets in the companion entry."
  ],
  "table": {
   "columns": [
    "profile",
    "size_mm",
    "slot_mm",
    "cavity_mm",
    "depth_mm",
    "bore_mm",
    "type"
   ],
   "rows": [
    [
     "2020",
     "20 × 20",
     6,
     11,
     6,
     4.2,
     "T"
    ],
    [
     "2040",
     "40 × 20",
     6,
     11,
     6,
     4.2,
     "T"
    ],
    [
     "2060",
     "60 × 20",
     6,
     11,
     6,
     4.2,
     "T"
    ],
    [
     "2080",
     "80 × 20",
     6,
     11,
     6,
     4.2,
     "T"
    ],
    [
     "4040 (20-series double)",
     "40 × 40",
     6,
     11,
     6,
     4.2,
     "T"
    ],
    [
     "V-slot 2020",
     "20 × 20",
     6.2,
     11,
     6,
     4.2,
     "V"
    ],
    [
     "V-slot 2040",
     "40 × 20",
     6.2,
     11,
     6,
     4.2,
     "V"
    ],
    [
     "V-slot 2080",
     "80 × 20",
     6.2,
     11,
     6,
     4.2,
     "V"
    ],
    [
     "3030",
     "30 × 30",
     8,
     16.5,
     8.5,
     6.8,
     "T"
    ],
    [
     "3060",
     "60 × 30",
     8,
     16.5,
     8.5,
     6.8,
     "T"
    ],
    [
     "4040",
     "40 × 40",
     8,
     20,
     9.5,
     6.8,
     "T"
    ],
    [
     "4080",
     "80 × 40",
     8,
     20,
     9.5,
     6.8,
     "T"
    ],
    [
     "4040 heavy (10 mm slot)",
     "40 × 40",
     10,
     22,
     11,
     8.5,
     "T"
    ],
    [
     "1010 (1 in, 10-series)",
     "25.4 × 25.4",
     6.5,
     14.4,
     7.1,
     5.1,
     "T"
    ],
    [
     "1020",
     "50.8 × 25.4",
     6.5,
     14.4,
     7.1,
     5.1,
     "T"
    ],
    [
     "1515 (1.5 in, 15-series)",
     "38.1 × 38.1",
     8.2,
     20.5,
     9.6,
     6.6,
     "T"
    ]
   ]
  }
 },
 "sheet_text": "Aluminium T-slot extrusion: 2020, 2040, 2060, 2080, V-slot, 3030, 3060, 4040, 4080, 1010, 1515 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/t-slot-extrusions/  (CC BY 4.0)\nBasis: Common European / Misumi 20-, 30- and 40-series profiles (6 and 8 mm slots), OpenBuilds V-slot, and 80/20 10- and 15-series inch profiles; cavity dimensions typical of the 'standard' (non-light) profile, ±0.3 mm by maker\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 20-series (2020, 2040…): 20 mm pitch, 6.0 mm slot opening, ~11 mm wide slot cavity behind 1.8 mm lips, 6 mm deep, Ø4.2 centre bore (tap M5). V-slot is the same with 6.2 mm opening and 45° chamfered lips for Delrin wheels. 30-series: 8 mm slot, Ø6.8 bore (M8). 40-series: 8 mm slot (10 mm on heavy), Ø6.8–8.5 bore. 80/20 10-series: 1 in, 0.256 in (6.5 mm) slot, 0.2 in bore (1/4-20); 15-series: 1.5 in, 0.32 in (8.2 mm) slot, 0.26 in bore (5/16-18).\n- Print the profile to check brackets before cutting aluminium: 100 mm stubs here. Printed extrusion is not structural, but a printed 2020 stub with slide-in nuts is exactly how to prototype a mount.\n- Design rule for attachments: anything that touches the extrusion face is flat; anything in the slot is 5.8 mm wide (6 mm slot) or 7.8 mm (8 mm slot) and no deeper than the lip + 0.5 mm unless it is a nut. Tongues on brackets stop rotation. M5 button heads on 20-series, M8 on 40-series.\n- LES: the engine test stands and the generator rigs are 2020 and 2040 frames with the printed brackets in the companion entry.\n\nprofile  size_mm  slot_mm  cavity_mm  depth_mm  bore_mm  type\n2020  20 × 20  6.0  11.0  6.0  4.2  T\n2040  40 × 20  6.0  11.0  6.0  4.2  T\n2060  60 × 20  6.0  11.0  6.0  4.2  T\n2080  80 × 20  6.0  11.0  6.0  4.2  T\n4040 (20-series double)  40 × 40  6.0  11.0  6.0  4.2  T\nV-slot 2020  20 × 20  6.2  11.0  6.0  4.2  V\nV-slot 2040  40 × 20  6.2  11.0  6.0  4.2  V\nV-slot 2080  80 × 20  6.2  11.0  6.0  4.2  V\n3030  30 × 30  8.0  16.5  8.5  6.8  T\n3060  60 × 30  8.0  16.5  8.5  6.8  T\n4040  40 × 40  8.0  20.0  9.5  6.8  T\n4080  80 × 40  8.0  20.0  9.5  6.8  T\n4040 heavy (10 mm slot)  40 × 40  10.0  22.0  11.0  8.5  T\n1010 (1 in, 10-series)  25.4 × 25.4  6.5  14.4  7.1  5.1  T\n1020  50.8 × 25.4  6.5  14.4  7.1  5.1  T\n1515 (1.5 in, 15-series)  38.1 × 38.1  8.2  20.5  9.6  6.6  T\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: T-slot structural framing — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/T-slot_structural_framing\n- Misumi: Aluminum extrusions HFS5 (20 mm) / HFS6 (30 mm) / HFS8 (40 mm) series drawings — web, STEP, PDF — Misumi site terms [verify license at link] — https://us.misumi-ec.com/vona2/mech/M1500000000/M1501000000/\n- 80/20 Inc.: 10-series and 15-series T-slot profiles — web, STEP, PDF — 80/20 site terms [verify license at link] — https://8020.net/\n- OpenBuilds: V-Slot linear rail profiles — web, STEP — OpenBuilds, CC BY-SA 4.0 (V-Slot) [verify license at link] — https://openbuildspartstore.com/v-slot-linear-rail/\n- Long Earth Society: Engine and rig builds on extrusion frames — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 16 parts): https://xemstudio.com/files/hardware/t-slot-extrusions/index.json\nAPI: https://xemstudio.com/api/geometry?object=t-slot-extrusions\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "T-slot structural framing",
   "url": "https://en.wikipedia.org/wiki/T-slot_structural_framing",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Misumi",
   "title": "Aluminum extrusions HFS5 (20 mm) / HFS6 (30 mm) / HFS8 (40 mm) series drawings",
   "url": "https://us.misumi-ec.com/vona2/mech/M1500000000/M1501000000/",
   "formats": [
    "web",
    "STEP",
    "PDF"
   ],
   "license": "Misumi site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "80/20 Inc.",
   "title": "10-series and 15-series T-slot profiles",
   "url": "https://8020.net/",
   "formats": [
    "web",
    "STEP",
    "PDF"
   ],
   "license": "80/20 site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "OpenBuilds",
   "title": "V-Slot linear rail profiles",
   "url": "https://openbuildspartstore.com/v-slot-linear-rail/",
   "formats": [
    "web",
    "STEP"
   ],
   "license": "OpenBuilds, CC BY-SA 4.0 (V-Slot)",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine and rig builds on extrusion frames",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
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 },
 "related": [
  "t-slot-brackets-and-nuts",
  "2020-extrusion",
  "button-head-screws-metric",
  "hex-nuts-metric",
  "mgn-linear-rails",
  "nema-17-stepper"
 ],
 "faq": [
  {
   "q": "What is the slot width on 2020 extrusion?",
   "a": "6.0 mm opening (6.2 on V-slot) with a cavity about 11 mm wide and 6 mm deep behind 1.8 mm lips; the centre bore is Ø4.2 for an M5 tap."
  },
  {
   "q": "What is the difference between 2020 and V-slot 2020?",
   "a": "Same 20 × 20 size and 6 mm-class slot; V-slot adds 45° chamfers on the slot lips so Delrin V-wheels ride in the groove. T-nuts fit both."
  },
  {
   "q": "What size T-nut for 4040 extrusion?",
   "a": "8 mm slot: M6 or M8 T-nuts (M5 on the 20-series 6 mm slot; 1/4-20 on 80/20 10-series)."
  },
  {
   "q": "Is 2020 extrusion metric or inch?",
   "a": "Metric (20 mm). The inch equivalents are 80/20 10-series (1 in, 25.4 mm) and 15-series (1.5 in); their slots and bores differ, so brackets don't interchange."
  }
 ],
 "files_license": null,
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   "note": "2020: 20 × 20 mm, slot 6.0 mm, 100 mm stub"
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   "note": "2040: 40 × 20 mm, slot 6.0 mm, 100 mm stub"
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   "note": "2060: 60 × 20 mm, slot 6.0 mm, 100 mm stub"
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   "note": "4040 (20-series double): 40 × 40 mm, slot 6.0 mm, 100 mm stub"
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   "note": "4040 heavy (10 mm slot): 40 × 40 mm, slot 10.0 mm, 100 mm stub"
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   "note": "1010 (1 in, 10-series): 25.4 × 25.4 mm, slot 6.5 mm, 100 mm stub"
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   "note": "1020: 50.8 × 25.4 mm, slot 6.5 mm, 100 mm stub"
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   "note": "1515 (1.5 in, 15-series): 38.1 × 38.1 mm, slot 8.2 mm, 100 mm stub"
  }
 ],
 "markdown": "https://xemstudio.com/objects/t-slot-extrusions/index.md"
}