{
 "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-corner-brackets",
 "name": "L corner brackets for 20, 30, 40 and 10-series extrusion",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "What size corner bracket for 2020 extrusion?",
 "tags": [
  "bracket",
  "corner bracket",
  "extrusion",
  "2020",
  "t-slot",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "2020 corner bracket stl",
  "extrusion bracket 3d print",
  "l bracket 2020",
  "3030 corner bracket",
  "t slot angle bracket"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 4,
 "url": "https://xemstudio.com/objects/t-slot-corner-brackets/",
 "sheet_txt": "https://xemstudio.com/objects/t-slot-corner-brackets/sheet.txt",
 "sheet": {
  "basis": "L bracket as wide and tall as the profile, one screw slot per leg at ISO 273 clearance (M5 Ø5.5, M6 Ø6.6, M8 Ø9.0, 1/4-20 Ø7.14), side gussets",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Each bracket is an L the size of the profile (20, 30, 40 or 25.4 mm cube) with a gusset on each side.",
   "Leg thickness is 3 mm on 20-series, 4.5 on 30, 6 on 40 and 3.81 on 10-series.",
   "Each leg has one screw slot at ISO 273 clearance: 20-series Ø5.5 × 6 long (M5), 30 Ø6.6 × 9 (M6), 40 Ø9 × 12 (M8), 10-series Ø7.14 × 7.62 (1/4-20).",
   "The legs are flat; there is no locating tongue on these brackets."
  ],
  "table": {
   "columns": [
    "series",
    "size_mm",
    "thickness_mm",
    "slot_mm",
    "screw"
   ],
   "rows": [
    [
     "20",
     20,
     3,
     "5.5 × 6",
     "M5"
    ],
    [
     "30",
     30,
     4.5,
     "6.6 × 9",
     "M6"
    ],
    [
     "40",
     40,
     6,
     "9 × 12",
     "M8"
    ],
    [
     "10 (1 in)",
     25.4,
     3.81,
     "7.14 × 7.62",
     "1/4-20"
    ]
   ]
  }
 },
 "sheet_text": "L corner brackets for 20, 30, 40 and 10-series extrusion — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/t-slot-corner-brackets/  (CC BY 4.0)\nBasis: L bracket as wide and tall as the profile, one screw slot per leg at ISO 273 clearance (M5 Ø5.5, M6 Ø6.6, M8 Ø9.0, 1/4-20 Ø7.14), side gussets\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Each bracket is an L the size of the profile (20, 30, 40 or 25.4 mm cube) with a gusset on each side.\n- Leg thickness is 3 mm on 20-series, 4.5 on 30, 6 on 40 and 3.81 on 10-series.\n- Each leg has one screw slot at ISO 273 clearance: 20-series Ø5.5 × 6 long (M5), 30 Ø6.6 × 9 (M6), 40 Ø9 × 12 (M8), 10-series Ø7.14 × 7.62 (1/4-20).\n- The legs are flat; there is no locating tongue on these brackets.\n\nseries  size_mm  thickness_mm  slot_mm  screw\n20  20  3  5.5 × 6  M5\n30  30  4.5  6.6 × 9  M6\n40  40  6  9 × 12  M8\n10 (1 in)  25.4  3.81  7.14 × 7.62  1/4-20\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, 4 parts): https://xemstudio.com/files/hardware/t-slot-corner-brackets/index.json\nAPI: https://xemstudio.com/api/geometry?object=t-slot-corner-brackets\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,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "slide-in-t-nuts",
  "drop-in-t-nuts",
  "t-slot-gussets",
  "t-slot-extrusions",
  "2020-extrusion",
  "button-head-screws-metric"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "t-slot-extrusions",
     "why": "legs flat on two profile faces at 90°"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "t-slot-gussets",
     "why": "inside-corner gusset"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "slide-in-t-nuts",
     "why": "M5 / M6 / M8 / 1/4-20 screw through the slot into a T-nut"
    }
   ]
  }
 ],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. 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.",
 "mating": [
  {
   "feature": "bracket / gusset / plate screw holes",
   "exact": "Ø5.5 / 6.6 / 9.0 / 7.14",
   "mates": "M5 / M6 / M8 / 1/4-20 clearance",
   "fit": "designed",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "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. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "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 screw for a 2020 corner bracket?",
   "a": "M5 through the Ø5.5 slot into a 20-series T-nut."
  },
  {
   "q": "How thick is the 2020 bracket?",
   "a": "3 mm legs, 20 × 20 × 20 overall with side gussets."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "corner-bracket-20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/corner-bracket-20.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/corner-bracket-20.stl",
   "note": "20-series L corner bracket 20 × 20, two slots 5.5 wide (M5 clearance) × 10 long end to end (4.5 travel), side gussets"
  },
  {
   "file": "corner-bracket-30",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/corner-bracket-30.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/corner-bracket-30.stl",
   "note": "30-series L corner bracket 30 × 30, two slots 6.6 wide (M6 clearance) × 15 long end to end (8.4 travel), side gussets"
  },
  {
   "file": "corner-bracket-40",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/corner-bracket-40.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/corner-bracket-40.stl",
   "note": "40-series L corner bracket 40 × 40, two slots 9 wide (M8 clearance) × 20 long end to end (11 travel), side gussets"
  },
  {
   "file": "corner-bracket-10in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/corner-bracket-10in.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/corner-bracket-10in.stl",
   "note": "10in-series L corner bracket 25.4 × 25.4, two slots 7.14 wide (1/4-20 clearance) × 12.7 long end to end (5.56 travel), side gussets"
  }
 ],
 "markdown": "https://xemstudio.com/objects/t-slot-corner-brackets/index.md"
}