{
 "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-brackets-and-nuts",
 "name": "T-slot attachments: slide-in and drop-in T-nuts, corner brackets, gussets, end caps, slot covers, feet, hole plates",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "What are 2020 T-nut dimensions and how do I design a bracket for aluminium extrusion?",
 "tags": [
  "t-nut",
  "bracket",
  "extrusion",
  "frame",
  "2020",
  "gusset",
  "end cap",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "2020 t nut dimensions",
  "drop in t nut 2020",
  "2020 corner bracket stl",
  "extrusion bracket 3d print",
  "2020 end cap stl",
  "t slot cover 3d print",
  "4040 t nut",
  "8020 t nut"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 46,
 "url": "https://xemstudio.com/objects/t-slot-brackets-and-nuts/",
 "sheet_txt": "https://xemstudio.com/objects/t-slot-brackets-and-nuts/sheet.txt",
 "sheet": {
  "basis": "Sized to the profile entry: 20-series (6 mm slot, M5), 30-series (8 mm, M6/M8), 40-series (8 mm), 80/20 10-series (0.256 in, 1/4-20); T-nut envelopes match the common steel ones",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Slide-in T-nut, 20-series: 10 × 10 × 4.5 mm body with a 5.6 mm tongue; drop-in: 10 × 5.6 × 4.5, rotates 90° in the slot. 30/40-series: 15.5 × 15.5 × 6.5 and 15.5 × 7.6 drop-in. Steel nuts are stronger; printed ones (PETG, M3/M4) hold light fixtures and are the pattern for the bracket pocket.",
   "Bracket rule: a flat face, a tongue 5.8 mm wide (6 mm slot) × 1.5 mm proud to stop rotation, and a slot (not a hole) along the extrusion so it slides to position. 20 mm L-bracket with two slots and side gussets carries a NEMA 17; the inside gusset makes a 90° frame joint square.",
   "End caps press pins into the centre bores (Ø4.2 + 0.15 on 20-series). Slot covers snap into the 6 mm opening and hide wiring. Feet take an M5 into the bore. Plates on the slot pitch give you a mounting grid.",
   "Everything is parametrized from the extrusion sheet; scale the 20-series parts by 1.5 for 30, by 2 for 40 only where the slot width allows (it doesn't: 30/40 share the 8 mm slot, so the tongue stays 7.8)."
  ],
  "table": {
   "columns": [
    "part",
    "20-series",
    "30-series",
    "40-series",
    "10-series (in)"
   ],
   "rows": [
    [
     "slide-in T-nut",
     "10 × 10 × 4.5, M3–M5",
     "15.5 × 15.5 × 6.5, M5–M8",
     "19 × 19 × 7, M6/M8",
     "12.7 × 13.4 × 4.8, 1/4-20"
    ],
    [
     "drop-in T-nut",
     "10 × 5.6 × 4.5",
     "15.5 × 7.6 × 6.5",
     "19 × 7.6 × 7",
     "13.4 × 6.1 × 4.8"
    ],
    [
     "corner bracket",
     "20 × 20 × 20, 3 thick",
     "30 × 30 × 30, 4.5",
     "40 × 40 × 40, 6",
     "25.4 cube, 4"
    ],
    [
     "gusset",
     "20 × 20",
     "30 × 30",
     "40 × 40",
     "25.4"
    ],
    [
     "end cap pins",
     "Ø4.35",
     "Ø6.95",
     "Ø6.95",
     "Ø5.25"
    ],
    [
     "slot cover",
     "6 mm",
     "8 mm",
     "8 mm",
     "6.5 mm"
    ],
    [
     "screws",
     "M5 button, M4/M3 with printed nuts",
     "M6 / M8",
     "M8",
     "1/4-20 BHCS"
    ]
   ]
  }
 },
 "sheet_text": "T-slot attachments: slide-in and drop-in T-nuts, corner brackets, gussets, end caps, slot covers, feet, hole plates — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/t-slot-brackets-and-nuts/  (CC BY 4.0)\nBasis: Sized to the profile entry: 20-series (6 mm slot, M5), 30-series (8 mm, M6/M8), 40-series (8 mm), 80/20 10-series (0.256 in, 1/4-20); T-nut envelopes match the common steel ones\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Slide-in T-nut, 20-series: 10 × 10 × 4.5 mm body with a 5.6 mm tongue; drop-in: 10 × 5.6 × 4.5, rotates 90° in the slot. 30/40-series: 15.5 × 15.5 × 6.5 and 15.5 × 7.6 drop-in. Steel nuts are stronger; printed ones (PETG, M3/M4) hold light fixtures and are the pattern for the bracket pocket.\n- Bracket rule: a flat face, a tongue 5.8 mm wide (6 mm slot) × 1.5 mm proud to stop rotation, and a slot (not a hole) along the extrusion so it slides to position. 20 mm L-bracket with two slots and side gussets carries a NEMA 17; the inside gusset makes a 90° frame joint square.\n- End caps press pins into the centre bores (Ø4.2 + 0.15 on 20-series). Slot covers snap into the 6 mm opening and hide wiring. Feet take an M5 into the bore. Plates on the slot pitch give you a mounting grid.\n- Everything is parametrized from the extrusion sheet; scale the 20-series parts by 1.5 for 30, by 2 for 40 only where the slot width allows (it doesn't: 30/40 share the 8 mm slot, so the tongue stays 7.8).\n\npart  20-series  30-series  40-series  10-series (in)\nslide-in T-nut  10 × 10 × 4.5, M3–M5  15.5 × 15.5 × 6.5, M5–M8  19 × 19 × 7, M6/M8  12.7 × 13.4 × 4.8, 1/4-20\ndrop-in T-nut  10 × 5.6 × 4.5  15.5 × 7.6 × 6.5  19 × 7.6 × 7  13.4 × 6.1 × 4.8\ncorner bracket  20 × 20 × 20, 3 thick  30 × 30 × 30, 4.5  40 × 40 × 40, 6  25.4 cube, 4\ngusset  20 × 20  30 × 30  40 × 40  25.4\nend cap pins  Ø4.35  Ø6.95  Ø6.95  Ø5.25\nslot cover  6 mm  8 mm  8 mm  6.5 mm\nscrews  M5 button, M4/M3 with printed nuts  M6 / M8  M8  1/4-20 BHCS\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: T-slot nut — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/T-slot_nut\n- OpenBuilds: Tee nuts and brackets for V-slot — web, STEP — OpenBuilds site [verify license at link] — https://openbuildspartstore.com/\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, 46 parts): https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/index.json\nAPI: https://xemstudio.com/api/geometry?object=t-slot-brackets-and-nuts\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "T-slot nut",
   "url": "https://en.wikipedia.org/wiki/T-slot_nut",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "OpenBuilds",
   "title": "Tee nuts and brackets for V-slot",
   "url": "https://openbuildspartstore.com/",
   "formats": [
    "web",
    "STEP"
   ],
   "license": "OpenBuilds site",
   "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": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
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  "tolerance_mm": null
 },
 "related": [
  "t-slot-extrusions",
  "2020-extrusion",
  "button-head-screws-metric",
  "heat-set-inserts",
  "nema-17-stepper",
  "mgn-linear-rails"
 ],
 "faq": [
  {
   "q": "What are 2020 T-nut dimensions?",
   "a": "Slide-in: about 10 × 10 mm, 4.5 mm thick with a 5.6 mm wide tongue; drop-in: 10 × 5.6 × 4.5 mm so it passes the 6 mm slot and turns to lock. Threads M3, M4 or M5."
  },
  {
   "q": "How do I design a bracket that attaches to 2020 extrusion?",
   "a": "Flat face on the extrusion, a 5.8 mm wide tongue 1.5 mm proud in the slot to stop rotation, and a slotted hole for an M5 button head into a T-nut; keep 2 mm of wall around the slot."
  },
  {
   "q": "Can I 3D print T-nuts?",
   "a": "For light loads, yes in PETG with an M3/M4 tapped hole or a heat-set insert; for anything structural use steel nuts and the printed ones only as pocket patterns."
  }
 ],
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