Sao tsugi (keyed rod splice) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/sao-tsugi-rod-splice/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design — geometry computed in the generator from traditional proportions
Catalog version: 2026-10-20

Overall (mm): length 140.0, width 28.0, height 20.0
- 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).
- A long tenon in a long mortise, locked by keys driven across — the Japanese splice for long rods and tie beams.

dimension  value
stock  20 × 20 mm square
parts  male, female, key 1, key 2
tenon  8 × 8 mm, 40 mm long
keys  two, 4 × 4 mm, through the female member and the tenon
assembles  tenon in, keys driven across
holds  pulling apart lengthwise, firmly

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Xem Studio: Joinery design (geometry computed in the generator from traditional proportions) — web — Xem Studio design — https://xemstudio.com/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 5 parts): https://xemstudio.com/files/hardware/sao-tsugi-rod-splice/index.json
API: https://xemstudio.com/api/geometry?object=sao-tsugi-rod-splice