Xem Studiomeasured geometryLibrary › Joinery › Mortise & tenon joints ·
Blind mortise and tenon joint
What are the proportions of a mortise and tenon joint? · Hardware · basis: Xem Studio design — geometry computed in the generator from traditional proportions
Also called: mortise and tenon joint, blind mortise and tenon, stopped mortise and tenon, mortise and tenon dimensions, mortise and tenon proportions, caja y espiga, ensamble de caja y espiga, Zapfenverbindung, Schlitz und Zapfen verdeckt
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).
- The classic frame joint: a tenon one third of the stock thick, stopped inside the mortised member so the end grain is hidden.
- Print the rail with the tenon flat on the bed; the stile prints with the mortise opening up.
Blind mortise and tenon joint size chart
| dimension | value |
|---|---|
| stock | 20 × 20 mm square |
| parts | stile, rail |
| tenon thickness | 6.67 mm (one third of the stock) |
| tenon width | 15 mm (2.5 mm shoulders) |
| tenon length | 15 mm (three quarters of the mortised member) |
| assembles | the tenon slides straight into the mortise |
| holds | racking; add a pin or glue against pull-out (see pegged and drawbored) |
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
| blind-mortise-and-tenon-joint-stile | Mortised member (stile / leg) | STEP · STL |
| blind-mortise-and-tenon-joint-rail | Tenoned member (rail) | STEP · STL |
| blind-mortise-and-tenon-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=blind-mortise-and-tenon-joint
Fits with
Questions
How thick should a tenon be?
About one third of the stock: 6.67 mm in 20 mm stock.
How long should a tenon be?
Here 15 mm into a 20 mm member — about three quarters of its depth.