{
 "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-joining-plates",
 "name": "2 × 3 hole joining plates for 20, 30, 40 and 10-series extrusion",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "What hole spacing for a 2020 joining plate?",
 "tags": [
  "plate",
  "joining plate",
  "extrusion",
  "2020",
  "t-slot",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "2020 joining plate",
  "t slot plate stl",
  "extrusion mounting plate",
  "2020 tee plate",
  "3030 joining plate"
 ],
 "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-joining-plates/",
 "sheet_txt": "https://xemstudio.com/objects/t-slot-joining-plates/sheet.txt",
 "sheet": {
  "basis": "Flat plate, 2 × 3 holes on the profile pitch, ISO 273 clearance holes, 5 mm thick",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Each plate is 5 mm thick with R3 corners and six holes in a 2 × 3 grid on the profile pitch, one hole per profile centreline.",
   "20-series: 40 × 60, Ø5.5 holes (M5) on 20 mm pitch. 30-series: 60 × 90, Ø6.6 (M6) on 30. 40-series: 80 × 120, Ø9 (M8) on 40. 10-series: 50.8 × 76.2, Ø7.14 (1/4-20) on 25.4.",
   "Use it to join profiles in a T or L, or as a mounting grid."
  ],
  "table": {
   "columns": [
    "series",
    "plate_mm",
    "pitch_mm",
    "hole_mm",
    "screw"
   ],
   "rows": [
    [
     "20",
     "40 × 60 × 5",
     20,
     5.5,
     "M5"
    ],
    [
     "30",
     "60 × 90 × 5",
     30,
     6.6,
     "M6"
    ],
    [
     "40",
     "80 × 120 × 5",
     40,
     9,
     "M8"
    ],
    [
     "10 (1 in)",
     "50.8 × 76.2 × 5",
     25.4,
     7.14,
     "1/4-20"
    ]
   ]
  }
 },
 "sheet_text": "2 × 3 hole joining plates for 20, 30, 40 and 10-series extrusion — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/t-slot-joining-plates/  (CC BY 4.0)\nBasis: Flat plate, 2 × 3 holes on the profile pitch, ISO 273 clearance holes, 5 mm thick\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Each plate is 5 mm thick with R3 corners and six holes in a 2 × 3 grid on the profile pitch, one hole per profile centreline.\n- 20-series: 40 × 60, Ø5.5 holes (M5) on 20 mm pitch. 30-series: 60 × 90, Ø6.6 (M6) on 30. 40-series: 80 × 120, Ø9 (M8) on 40. 10-series: 50.8 × 76.2, Ø7.14 (1/4-20) on 25.4.\n- Use it to join profiles in a T or L, or as a mounting grid.\n\nseries  plate_mm  pitch_mm  hole_mm  screw\n20  40 × 60 × 5  20  5.5  M5\n30  60 × 90 × 5  30  6.6  M6\n40  80 × 120 × 5  40  9  M8\n10 (1 in)  50.8 × 76.2 × 5  25.4  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-joining-plates/index.json\nAPI: https://xemstudio.com/api/geometry?object=t-slot-joining-plates\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-gussets",
  "slide-in-t-nuts",
  "t-slot-extrusions",
  "2020-extrusion",
  "button-head-screws-metric"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "t-slot-extrusions",
     "why": "holes on the profile pitch over the slot centrelines"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "t-slot-gussets",
     "why": "corner joint"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "slide-in-t-nuts",
     "why": "screw through each 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 hole spacing on a 2020 plate?",
   "a": "20 mm, the profile pitch, with Ø5.5 holes for M5."
  },
  {
   "q": "How thick are the plates?",
   "a": "5 mm for every series."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "plate-20-2x3",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/plate-20-2x3.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/plate-20-2x3.stl",
   "note": "20-series 2 × 3 hole plate on 20 mm pitch, 5 thick, Ø5.5 holes (M5 clearance)"
  },
  {
   "file": "plate-30-2x3",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/plate-30-2x3.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/plate-30-2x3.stl",
   "note": "30-series 2 × 3 hole plate on 30 mm pitch, 5 thick, Ø6.6 holes (M6 clearance)"
  },
  {
   "file": "plate-40-2x3",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/plate-40-2x3.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/plate-40-2x3.stl",
   "note": "40-series 2 × 3 hole plate on 40 mm pitch, 5 thick, Ø9 holes (M8 clearance)"
  },
  {
   "file": "plate-10in-2x3",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/plate-10in-2x3.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/plate-10in-2x3.stl",
   "note": "10in-series 2 × 3 hole plate on 25.4 mm pitch, 5 thick, Ø7.14 holes (1/4-20 clearance)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/t-slot-joining-plates/index.md"
}