Xem Studiomeasured geometryLibrary › Joinery › Scarf & splice joints ·
Plain scarf joint (1:4)
What slope is a scarf joint? · Hardware · basis: Xem Studio design — geometry computed in the generator from traditional proportions
Also called: scarf joint, plain scarf, scarf joint ratio, scarf joint slope, empalme biselado, Schäftung, Schäftverbindung
Exact dimensions. True size, with no printing tolerance added.
- length
- 200.0 mm
- width
- 20.0 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).
- Joins two members end to end along a long sloped face. 1:8 to 1:12 is used for structural glued scarfs; 1:4 keeps the part short.
Plain scarf joint size chart
| dimension | value |
|---|---|
| stock | 20 × 20 mm square |
| parts | part a, part b |
| slope | 1:4 (80 mm long in 20 mm stock) |
| assembles | faces together, glued or bolted |
| holds | only with glue or fasteners |
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
| plain-scarf-joint-part-a | Member A with a 1:4 scarf | STEP · STL |
| plain-scarf-joint-part-b | Member B with the matching scarf | STEP · STL |
| plain-scarf-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=plain-scarf-joint
Fits with
Questions
What ratio for a scarf joint?
1:8 to 1:12 for glued structural joints; this one is 1:4 to keep the part short.