{
 "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-gussets",
 "name": "Inside corner gussets for 20, 30, 40 and 10-series extrusion",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "What size gusset for a 2020 extrusion inside corner?",
 "tags": [
  "gusset",
  "bracket",
  "extrusion",
  "2020",
  "t-slot",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "2020 gusset stl",
  "extrusion inside corner bracket",
  "t slot gusset",
  "3030 gusset",
  "corner gusset 3d print"
 ],
 "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-gussets/",
 "sheet_txt": "https://xemstudio.com/objects/t-slot-gussets/sheet.txt",
 "sheet": {
  "basis": "Inside corner gusset: legs the profile size × 0.8 profile tall, triangular web, one ISO 273 clearance hole per leg",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Each gusset has two legs as long as the profile is wide and 0.8 × that tall, joined by a triangular web at mid-height.",
   "Legs are 3 mm thick on 20-series and 4 mm on 30, 40 and 10-series: 20 × 16 × 3, 30 × 24 × 4, 40 × 32 × 4, 25.4 × 20.32 × 4 mm.",
   "Each leg has one hole 0.6 × profile from the corner and 0.4 × profile up: Ø5.5 (M5), Ø6.6 (M6), Ø9 (M8), Ø7.14 (1/4-20)."
  ],
  "table": {
   "columns": [
    "series",
    "leg_mm",
    "thickness_mm",
    "hole_mm",
    "screw"
   ],
   "rows": [
    [
     "20",
     "20 × 16",
     3,
     5.5,
     "M5"
    ],
    [
     "30",
     "30 × 24",
     4,
     6.6,
     "M6"
    ],
    [
     "40",
     "40 × 32",
     4,
     9,
     "M8"
    ],
    [
     "10 (1 in)",
     "25.4 × 20.32",
     4,
     7.14,
     "1/4-20"
    ]
   ]
  }
 },
 "sheet_text": "Inside corner gussets for 20, 30, 40 and 10-series extrusion — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/t-slot-gussets/  (CC BY 4.0)\nBasis: Inside corner gusset: legs the profile size × 0.8 profile tall, triangular web, one ISO 273 clearance hole per leg\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Each gusset has two legs as long as the profile is wide and 0.8 × that tall, joined by a triangular web at mid-height.\n- Legs are 3 mm thick on 20-series and 4 mm on 30, 40 and 10-series: 20 × 16 × 3, 30 × 24 × 4, 40 × 32 × 4, 25.4 × 20.32 × 4 mm.\n- Each leg has one hole 0.6 × profile from the corner and 0.4 × profile up: Ø5.5 (M5), Ø6.6 (M6), Ø9 (M8), Ø7.14 (1/4-20).\n\nseries  leg_mm  thickness_mm  hole_mm  screw\n20  20 × 16  3  5.5  M5\n30  30 × 24  4  6.6  M6\n40  40 × 32  4  9  M8\n10 (1 in)  25.4 × 20.32  4  7.14  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-gussets/index.json\nAPI: https://xemstudio.com/api/geometry?object=t-slot-gussets\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": [
  "t-slot-corner-brackets",
  "slide-in-t-nuts",
  "t-slot-joining-plates",
  "t-slot-extrusions",
  "2020-extrusion",
  "button-head-screws-metric"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "t-slot-extrusions",
     "why": "legs on two profile faces in the inside corner"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "t-slot-corner-brackets",
     "why": "L bracket"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "slide-in-t-nuts",
     "why": "screw through each leg hole 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 gusset?",
   "a": "M5 through each Ø5.5 hole into a T-nut."
  },
  {
   "q": "What is the difference between a gusset and a corner bracket?",
   "a": "The gusset sits in the inside corner with a triangular web; the corner bracket is an L with side gussets."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "gusset-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/gusset-20.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-20.stl",
   "note": "20-series inside corner gusset, 2 × Ø5.5 (M5 clearance)"
  },
  {
   "file": "gusset-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/gusset-30.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-30.stl",
   "note": "30-series inside corner gusset, 2 × Ø6.6 (M6 clearance)"
  },
  {
   "file": "gusset-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/gusset-40.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-40.stl",
   "note": "40-series inside corner gusset, 2 × Ø9 (M8 clearance)"
  },
  {
   "file": "gusset-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/gusset-10in.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/gusset-10in.stl",
   "note": "10in-series inside corner gusset, 2 × Ø7.14 (1/4-20 clearance)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/t-slot-gussets/index.md"
}