Xem Studiomeasured geometryLibrary › Joinery › Mitre joints ·
Keyed mitre joint (feather keys)
How do keys reinforce a mitre joint? · Hardware · basis: Xem Studio design — geometry computed in the generator from traditional proportions
Also called: keyed mitre, feather key mitre, mitre keys, miter keys, picture frame keys, inglete con llaves, Gehrung mit Federn
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).
- Thin keys across the outside corner of a mitre (as on picture frames) lock it and show as stripes.
Keyed mitre joint size chart
| dimension | value |
|---|---|
| stock | 20 × 20 mm square |
| parts | part a, part b, key 1, key 2 |
| mitre | 45° |
| keys | two, 2.5 mm thick, 12 mm legs, across the outside corner |
| assembles | close the mitre, slide the keys into the kerfs |
| holds | the mitre against opening |
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 5 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json
| keyed-mitre-joint-part-a | Mitred member A with two key kerfs | STEP · STL |
| keyed-mitre-joint-part-b | Mitred member B with two key kerfs | STEP · STL |
| keyed-mitre-joint-key-1 | Triangular key, 2.5 mm thick | STEP · STL |
| keyed-mitre-joint-key-2 | Triangular key, 2.5 mm thick | STEP · STL |
| keyed-mitre-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=keyed-mitre-joint
Fits with
Questions
Where do mitre keys go?
Across the outside corner, square to the frame face, one or two per corner.