# Tee halving joint (T-lap)

> What are the proportions of a tee halving joint?

- Category: Joinery › Lap & halving joints
- Kind: Hardware
- Basis: Xem Studio design — geometry computed in the generator from traditional proportions
- Page: https://xemstudio.com/objects/tee-halving-joint/ · JSON: https://xemstudio.com/api/geometry?object=tee-halving-joint · Plain text: https://xemstudio.com/objects/tee-halving-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 |
|---|---|---|
| 80.0 | 60.0 | 20.0 |

**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 T-shaped frame joint: the end of one member laps into a half-depth notch in the other.
- For a tension-proof T, use the dovetail halving joint instead.

## Sizes

| dimension | value |
|---|---|
| stock | 20 × 20 mm square |
| parts | cross member, end member |
| notch | 20 wide × 10 mm deep |
| end lap | 20 long × 10 mm |
| assembles | the end member drops into the notch from above |
| holds | racking; the end member can lift unless pinned |

## 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/tee-halving-joint/index.json · license: https://xemstudio.com/files/hardware/tee-halving-joint/LICENSE.md

- tee-halving-joint-cross-member: [STEP](https://xemstudio.com/files/hardware/tee-halving-joint/tee-halving-joint-cross-member.step) · [STL](https://xemstudio.com/files/hardware/tee-halving-joint/tee-halving-joint-cross-member.stl) — Through member: notch in the top half
- tee-halving-joint-end-member: [STEP](https://xemstudio.com/files/hardware/tee-halving-joint/tee-halving-joint-end-member.step) · [STL](https://xemstudio.com/files/hardware/tee-halving-joint/tee-halving-joint-end-member.stl) — End member: bottom half removed at its end
- tee-halving-joint-assembled: [STEP](https://xemstudio.com/files/hardware/tee-halving-joint/tee-halving-joint-assembled.step) · [STL](https://xemstudio.com/files/hardware/tee-halving-joint/tee-halving-joint-assembled.stl) — All parts in their assembled position (each part its own solid)

## Questions

**Does a T-lap resist pulling apart?**

No — it only holds sideways; the dovetail halving version locks against pulling out.

## Fits with

- [Dovetail halving joint (dovetail lap)](https://xemstudio.com/objects/dovetail-halving-joint/)
- [Half lap joint (corner)](https://xemstudio.com/objects/half-lap-joint/)
- [Cross lap joint (cross halving)](https://xemstudio.com/objects/cross-lap-joint/)