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Kanawa tsugi (keyed hooked splice)

Name: Kanawa tsugi (keyed hooked splice) dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How does a kanawa tsugi joint work? · Hardware · basis: Xem Studio design — geometry computed in the generator from traditional proportions

Also called: kanawa tsugi, 金輪継ぎ, kanawa joint, japanese keyed splice, japanese post splice, empalme japonés con llave, japanischer Stoß mit Keil

Exact dimensions. True size, with no printing tolerance added.

length: 220.0 mm
width: 20.0 mm
height: 32.0 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 hooked scarf locked by a square key driven through its middle, so it holds in every direction — used for posts and beams.

Kanawa tsugi size chart

dimension	value
stock	20 × 20 mm square
parts	part a, part b, key
scarf	100 mm with two 4 mm hooks
key	6 × 6 mm through the centre of the scarf
assembles	slide together sideways, drive the key through
holds	pulling apart lengthwise, bending, and sliding sideways (the key)

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 4 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json

kanawa-tsugi-splice-part-a	Member A: hooked scarf with half the key mortise	STEP · STL
kanawa-tsugi-splice-part-b	Member B: matching scarf and key mortise	STEP · STL
kanawa-tsugi-splice-key	Square key (komisen) 6 × 6 × 32 mm, proud 6 mm both faces	STEP · STL
kanawa-tsugi-splice-assembled	All parts in their assembled position (each part its own solid)	STEP · STL

Let your AI pull this. Add 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.

Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=kanawa-tsugi-splice