{
 "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": "hooked-scarf-joint",
 "name": "Hooked scarf joint (okkake tsugi)",
 "kind": "hardware",
 "category": "Joinery",
 "group": "Scarf & splice joints",
 "year": null,
 "question": "How does a hooked scarf joint resist pulling apart?",
 "tags": [
  "joinery",
  "woodworking joint",
  "3d printable",
  "connect 3d prints",
  "no glue",
  "stl",
  "step",
  "scarf & splice joints"
 ],
 "aliases": [
  "hooked scarf",
  "hooked scarf joint",
  "okkake tsugi",
  "okkake daisen tsugi",
  "追掛大栓継ぎ",
  "bladed scarf",
  "empalme de rayo",
  "Hakenblatt",
  "Hakenblattstoß"
 ],
 "overall_mm": {
  "length": 220,
  "width": 20,
  "height": 20
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 3,
 "url": "https://xemstudio.com/objects/hooked-scarf-joint/",
 "sheet_txt": "https://xemstudio.com/objects/hooked-scarf-joint/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design — geometry computed in the generator from traditional proportions",
  "overall_mm": {
   "length": 220,
   "width": 20,
   "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).",
   "A scarf with a hook at each end: point-symmetric, so pulling the members apart pushes the hooks together. The Japanese okkake tsugi adds pegs driven from the side; drawn here without them."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "stock",
     "20 × 20 mm square"
    ],
    [
     "parts",
     "part a, part b"
    ],
    [
     "length",
     "100 mm: a 76 mm slope between two 4 mm hooks"
    ],
    [
     "assembles",
     "slides together sideways (across the members)"
    ],
    [
     "holds",
     "pulling apart lengthwise (the hooks bear on each other) and bending; pin it against sliding sideways"
    ]
   ]
  }
 },
 "sheet_text": "Hooked scarf joint (okkake tsugi) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/hooked-scarf-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 220.0, width 20.0, 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- A scarf with a hook at each end: point-symmetric, so pulling the members apart pushes the hooks together. The Japanese okkake tsugi adds pegs driven from the side; drawn here without them.\n\ndimension  value\nstock  20 × 20 mm square\nparts  part a, part b\nlength  100 mm: a 76 mm slope between two 4 mm hooks\nassembles  slides together sideways (across the members)\nholds  pulling apart lengthwise (the hooks bear on each other) and bending; pin it against sliding sideways\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/hooked-scarf-joint/index.json\nAPI: https://xemstudio.com/api/geometry?object=hooked-scarf-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": [
  "kanawa-tsugi-splice",
  "plain-scarf-joint",
  "half-lap-splice-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": "Does a hooked scarf hold in tension?",
   "a": "Yes — both hooks bear when the members are pulled apart."
  }
 ],
 "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": "hooked-scarf-joint-part-a",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/hooked-scarf-joint/hooked-scarf-joint-part-a.step",
   "stl": "https://xemstudio.com/files/hardware/hooked-scarf-joint/hooked-scarf-joint-part-a.stl",
   "note": "Member A with two hooks"
  },
  {
   "file": "hooked-scarf-joint-part-b",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/hooked-scarf-joint/hooked-scarf-joint-part-b.step",
   "stl": "https://xemstudio.com/files/hardware/hooked-scarf-joint/hooked-scarf-joint-part-b.stl",
   "note": "Member B with the matching hooks"
  },
  {
   "file": "hooked-scarf-joint-assembled",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/hooked-scarf-joint/hooked-scarf-joint-assembled.step",
   "stl": "https://xemstudio.com/files/hardware/hooked-scarf-joint/hooked-scarf-joint-assembled.stl",
   "note": "All parts in their assembled position (each part its own solid)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/hooked-scarf-joint/index.md"
}