# Kanawa tsugi (keyed hooked splice)

> How does a kanawa tsugi joint work?

- Category: Joinery › Japanese joinery
- Kind: Hardware
- Basis: Xem Studio design — geometry computed in the generator from traditional proportions
- Page: https://xemstudio.com/objects/kanawa-tsugi-splice/ · JSON: https://xemstudio.com/api/geometry?object=kanawa-tsugi-splice · Plain text: https://xemstudio.com/objects/kanawa-tsugi-splice/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 220.0 | 20.0 | 32.0 |

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

## 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.

## Sizes

| 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

- Xem Studio: [Joinery design (geometry computed in the generator from traditional proportions)](https://xemstudio.com/) — web — Xem Studio design

## Free STEP/STL (4 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/kanawa-tsugi-splice/index.json · license: https://xemstudio.com/files/hardware/kanawa-tsugi-splice/LICENSE.md

- kanawa-tsugi-splice-part-a: [STEP](https://xemstudio.com/files/hardware/kanawa-tsugi-splice/kanawa-tsugi-splice-part-a.step) · [STL](https://xemstudio.com/files/hardware/kanawa-tsugi-splice/kanawa-tsugi-splice-part-a.stl) — Member A: hooked scarf with half the key mortise
- kanawa-tsugi-splice-part-b: [STEP](https://xemstudio.com/files/hardware/kanawa-tsugi-splice/kanawa-tsugi-splice-part-b.step) · [STL](https://xemstudio.com/files/hardware/kanawa-tsugi-splice/kanawa-tsugi-splice-part-b.stl) — Member B: matching scarf and key mortise
- kanawa-tsugi-splice-key: [STEP](https://xemstudio.com/files/hardware/kanawa-tsugi-splice/kanawa-tsugi-splice-key.step) · [STL](https://xemstudio.com/files/hardware/kanawa-tsugi-splice/kanawa-tsugi-splice-key.stl) — Square key (komisen) 6 × 6 × 32 mm, proud 6 mm both faces
- kanawa-tsugi-splice-assembled: [STEP](https://xemstudio.com/files/hardware/kanawa-tsugi-splice/kanawa-tsugi-splice-assembled.step) · [STL](https://xemstudio.com/files/hardware/kanawa-tsugi-splice/kanawa-tsugi-splice-assembled.stl) — All parts in their assembled position (each part its own solid)

## Questions

**What is the key for?**

It stops the halves sliding sideways and draws the hooks tight.

## Fits with

- [Hooked scarf joint (okkake tsugi)](https://xemstudio.com/objects/hooked-scarf-joint/)
- [Koshikake kama tsugi (lapped gooseneck splice)](https://xemstudio.com/objects/koshikake-kama-tsugi-lapped-gooseneck-splice/)