Xem Studiomeasured geometryLibrary › Joinery › Lap & halving joints ·
Cross lap joint (cross halving)
What are the proportions of a cross lap joint? · Hardware · basis: Xem Studio design — geometry computed in the generator from traditional proportions
Also called: cross lap joint, cross halving joint, middle lap joint, egg crate joint, cross lap joint dimensions, junta en cruz a media madera, ensamble cruzado, Kreuzüberblattung
Exact dimensions. True size, with no printing tolerance added.
- length
- 80.0 mm
- width
- 80.0 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).
- Two members cross flush: each is notched to half its depth across the other's width.
- Print both parts notch up; the notch floors are flat tops, so no supports are needed.
Cross lap joint size chart
| dimension | value |
|---|---|
| stock | 20 × 20 mm square |
| parts | part a, part b |
| notch width | 20 mm (the other member's width) |
| notch depth | 10 mm on each part |
| assembles | B drops onto A from above |
| holds | both members against sliding along each other |
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
| cross-lap-joint-part-a | Member A: notch in the top half | STEP · STL |
| cross-lap-joint-part-b | Member B: notch in the bottom half | STEP · STL |
| cross-lap-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=cross-lap-joint
Fits with
Questions
How deep is each notch in a cross lap?
Half the stock: 10 mm on each member, 20 mm wide.