{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "blind-mortise-and-tenon-joint",
 "name": "Blind mortise and tenon joint",
 "kind": "hardware",
 "category": "Joinery",
 "group": "Mortise & tenon joints",
 "year": null,
 "question": "What are the proportions of a mortise and tenon joint?",
 "tags": [
  "joinery",
  "woodworking joint",
  "3d printable",
  "connect 3d prints",
  "no glue",
  "stl",
  "step",
  "mortise & tenon joints"
 ],
 "aliases": [
  "mortise and tenon joint",
  "blind mortise and tenon",
  "stopped mortise and tenon",
  "mortise and tenon dimensions",
  "mortise and tenon proportions",
  "caja y espiga",
  "ensamble de caja y espiga",
  "Zapfenverbindung",
  "Schlitz und Zapfen verdeckt"
 ],
 "overall_mm": {
  "length": 80,
  "width": 80,
  "height": 20
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 3,
 "url": "https://xemstudio.com/objects/blind-mortise-and-tenon-joint/",
 "sheet_txt": "https://xemstudio.com/objects/blind-mortise-and-tenon-joint/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design — geometry computed in the generator from traditional proportions",
  "overall_mm": {
   "length": 80,
   "width": 80,
   "height": 20
  },
  "notes": [
   "Woodworking joint drawn for 3D printing: the parts lock together by shape, so a print can be joined without glue or screws. Drawn at true size with the parts line to line (zero gap) in their assembled position — add your printer's fit allowance to the mating faces (your AI or slicer can do this).",
   "The classic frame joint: a tenon one third of the stock thick, stopped inside the mortised member so the end grain is hidden.",
   "Print the rail with the tenon flat on the bed; the stile prints with the mortise opening up."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "stock",
     "20 × 20 mm square"
    ],
    [
     "parts",
     "stile, rail"
    ],
    [
     "tenon thickness",
     "6.67 mm (one third of the stock)"
    ],
    [
     "tenon width",
     "15 mm (2.5 mm shoulders)"
    ],
    [
     "tenon length",
     "15 mm (three quarters of the mortised member)"
    ],
    [
     "assembles",
     "the tenon slides straight into the mortise"
    ],
    [
     "holds",
     "racking; add a pin or glue against pull-out (see pegged and drawbored)"
    ]
   ]
  }
 },
 "sheet_text": "Blind mortise and tenon joint — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/blind-mortise-and-tenon-joint/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)\nBasis: Xem Studio design — geometry computed in the generator from traditional proportions\nCatalog version: 2026-10-20\n\nOverall (mm): length 80.0, width 80.0, height 20.0\n- Woodworking joint drawn for 3D printing: the parts lock together by shape, so a print can be joined without glue or screws. Drawn at true size with the parts line to line (zero gap) in their assembled position — add your printer's fit allowance to the mating faces (your AI or slicer can do this).\n- The classic frame joint: a tenon one third of the stock thick, stopped inside the mortised member so the end grain is hidden.\n- Print the rail with the tenon flat on the bed; the stile prints with the mortise opening up.\n\ndimension  value\nstock  20 × 20 mm square\nparts  stile, rail\ntenon thickness  6.67 mm (one third of the stock)\ntenon width  15 mm (2.5 mm shoulders)\ntenon length  15 mm (three quarters of the mortised member)\nassembles  the tenon slides straight into the mortise\nholds  racking; add a pin or glue against pull-out (see pegged and drawbored)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Xem Studio: Joinery design (geometry computed in the generator from traditional proportions) — web — Xem Studio design — https://xemstudio.com/\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/blind-mortise-and-tenon-joint/index.json\nAPI: https://xemstudio.com/api/geometry?object=blind-mortise-and-tenon-joint\n",
 "sources": [
  {
   "publisher": "Xem Studio",
   "title": "Joinery design (geometry computed in the generator from traditional proportions)",
   "url": "https://xemstudio.com/",
   "formats": [
    "web"
   ],
   "license": "Xem Studio design",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "through-mortise-and-tenon-joint",
  "haunched-mortise-and-tenon-joint",
  "pegged-mortise-and-tenon-joint",
  "loose-tenon-joint"
 ],
 "fits": [],
 "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": [],
 "faq": [
  {
   "q": "How thick should a tenon be?",
   "a": "About one third of the stock: 6.67 mm in 20 mm stock."
  },
  {
   "q": "How long should a tenon be?",
   "a": "Here 15 mm into a 20 mm member — about three quarters of its depth."
  }
 ],
 "files_license": {
  "name": "Xem Studio Design License",
  "holder": "Xem Studio",
  "url": "https://xemstudio.com/license/",
  "note": "Xem Studio's own design: free to use, print, modify and sell things made from it; not to be republished or redistributed as files."
 },
 "offers": [
  {
   "file": "blind-mortise-and-tenon-joint-stile",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/blind-mortise-and-tenon-joint/blind-mortise-and-tenon-joint-stile.step",
   "stl": "https://xemstudio.com/files/hardware/blind-mortise-and-tenon-joint/blind-mortise-and-tenon-joint-stile.stl",
   "note": "Mortised member (stile / leg)"
  },
  {
   "file": "blind-mortise-and-tenon-joint-rail",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/blind-mortise-and-tenon-joint/blind-mortise-and-tenon-joint-rail.step",
   "stl": "https://xemstudio.com/files/hardware/blind-mortise-and-tenon-joint/blind-mortise-and-tenon-joint-rail.stl",
   "note": "Tenoned member (rail)"
  },
  {
   "file": "blind-mortise-and-tenon-joint-assembled",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/blind-mortise-and-tenon-joint/blind-mortise-and-tenon-joint-assembled.step",
   "stl": "https://xemstudio.com/files/hardware/blind-mortise-and-tenon-joint/blind-mortise-and-tenon-joint-assembled.stl",
   "note": "All parts in their assembled position (each part its own solid)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/blind-mortise-and-tenon-joint/index.md"
}