# Tongue and groove joint

> What are the proportions of a tongue and groove joint?

- Category: Joinery › Edge & case joints
- Kind: Hardware
- Basis: Xem Studio design — geometry computed in the generator from traditional proportions
- Page: https://xemstudio.com/objects/tongue-and-groove-joint/ · JSON: https://xemstudio.com/api/geometry?object=tongue-and-groove-joint · Plain text: https://xemstudio.com/objects/tongue-and-groove-joint/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 |
|---|---|---|
| 120.0 | 80.0 | 10.0 |

**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).
- Edge-joins boards (panels, floors, enclosures) so the faces stay flush.

## Sizes

| dimension | value |
|---|---|
| stock | 10 mm boards, 60 mm wide |
| parts | tongue board, groove board |
| tongue | 3.33 mm thick (middle third), 5 mm long |
| assembles | edge to edge; slides in from the end or presses in |
| holds | the boards flush with each other; glue or a frame against pulling apart |

## 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 (3 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/tongue-and-groove-joint/index.json · license: https://xemstudio.com/files/hardware/tongue-and-groove-joint/LICENSE.md

- tongue-and-groove-joint-tongue-board: [STEP](https://xemstudio.com/files/hardware/tongue-and-groove-joint/tongue-and-groove-joint-tongue-board.step) · [STL](https://xemstudio.com/files/hardware/tongue-and-groove-joint/tongue-and-groove-joint-tongue-board.stl) — Board with the tongue
- tongue-and-groove-joint-groove-board: [STEP](https://xemstudio.com/files/hardware/tongue-and-groove-joint/tongue-and-groove-joint-groove-board.step) · [STL](https://xemstudio.com/files/hardware/tongue-and-groove-joint/tongue-and-groove-joint-groove-board.stl) — Board with the groove
- tongue-and-groove-joint-assembled: [STEP](https://xemstudio.com/files/hardware/tongue-and-groove-joint/tongue-and-groove-joint-assembled.step) · [STL](https://xemstudio.com/files/hardware/tongue-and-groove-joint/tongue-and-groove-joint-assembled.stl) — All parts in their assembled position (each part its own solid)

## Questions

**How thick is the tongue?**

One third of the board: 3.33 mm in a 10 mm board.

## Fits with

- [Dado joint (housing joint)](https://xemstudio.com/objects/dado-joint/)
- [Rabbet joint (rebate joint)](https://xemstudio.com/objects/rabbet-joint/)
- [Butterfly key (bow-tie, dutchman)](https://xemstudio.com/objects/butterfly-key-joint/)