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Library › Joinery › Japanese joinery ·

Koshikake kama tsugi (lapped gooseneck splice)

What is a koshikake kama tsugi joint? · Hardware · basis: Xem Studio design — geometry computed in the generator from traditional proportions

Also called: koshikake kama tsugi, 腰掛鎌継ぎ, lapped gooseneck splice, japanese sill splice, empalme japonés cuello de ganso con asiento

Exact dimensions. True size, with no printing tolerance added.

length
130.0 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).
  • The gooseneck splice with a seat — used for sills and beams that need a strong lengthwise lock.

Koshikake kama tsugi size chart

dimensionvalue
stock20 × 20 mm square
partsmale, female
gooseneck6 mm neck, 14 → 10 mm head, upper 14 mm
seat6 mm ledge
assemblesdrops in from above onto the seat
holdspulling apart lengthwise; the seat carries the load

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Xem StudioJoinery design (geometry computed in the generator from traditional proportions)webXem 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

koshikake-kama-tsugi-lapped-gooseneck-splice-maleMale member: gooseneck in the upper 14 mmSTEP · STL
koshikake-kama-tsugi-lapped-gooseneck-splice-femaleFemale member: socket plus the 6 mm seatSTEP · STL
koshikake-kama-tsugi-lapped-gooseneck-splice-assembledAll parts in their assembled position (each part its own solid)STEP · STL
Let your AI pull this. Add 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.
Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=koshikake-kama-tsugi-lapped-gooseneck-splice

Koshikake kama tsugi (lapped gooseneck splice), isometric render of a generated part
Render of koshikake-kama-tsugi-lapped-gooseneck-splice-assembled from the free STEP; not to scale.

Fits with

Kama tsugi (Japanese gooseneck splice), isometric render of a generated part
Kama tsugi (Japanese gooseneck splice)130.0×20.0×20.0 mm★ 3 files
Koshikake ari tsugi (lapped dovetail splice), isometric render of a generated part
Koshikake ari tsugi (lapped dovetail splice)130.0×20.0×20.0 mm★ 3 files

Questions

Why add a seat?

The male member rests on it, so the joint carries load without relying on the gooseneck alone.