Xem Studiomeasured geometryLibrary › Joinery › Scarf & splice joints ·
Hooked scarf joint (okkake tsugi)
How does a hooked scarf joint resist pulling apart? · Hardware · basis: Xem Studio design — geometry computed in the generator from traditional proportions
Also called: hooked scarf, hooked scarf joint, okkake tsugi, okkake daisen tsugi, 追掛大栓継ぎ, bladed scarf, empalme de rayo, Hakenblatt, Hakenblattstoß
Exact dimensions. True size, with no printing tolerance added.
- length
- 220.0 mm
- width
- 20.0 mm
- height
- 20.0 mm
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.
Hooked scarf joint size chart
| dimension | value |
|---|---|
| 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 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Xem Studio | Joinery design (geometry computed in the generator from traditional proportions) | web | Xem Studio design |
Free files
★ Free files 3 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json
| hooked-scarf-joint-part-a | Member A with two hooks | STEP · STL |
| hooked-scarf-joint-part-b | Member B with the matching hooks | STEP · STL |
| hooked-scarf-joint-assembled | All parts in their assembled position (each part its own solid) | STEP · STL |
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=hooked-scarf-joint
Fits with
Questions
Does a hooked scarf hold in tension?
Yes — both hooks bear when the members are pulled apart.