3D model: Yose-ari-hozo-shikuchi by thejoinery on Sketchfab
Assembly insights
San Mai Hozo functions like an inlaid mitred dovetail, typically half an inch thick. The three-piece geometry creates such a rigid connection that table legs and top become structurally unified. The joint exemplifies traditional Japanese joinery at its finest—so effective that structures could theoretically be assembled at large scale using this technique alone. Mastery demands precise layout and careful chisel work.
Historical context
San Mai Hozo (三枚ほぞ, three-piece tenon) represents one of the most demanding corner joints in Japanese furniture making. Three components—a leg and two sides of a mitred dovetail—interlock without glue or metal. The joint appears in heirloom tables, shrine fittings, and demonstration pieces that showcase a craftsman's skill. Students typically master Hozo Tsugi and Ari Otoshi before attempting San Mai Hozo.
Construction steps
- Lay out the mitre and dovetail geometry on all three pieces using angle jigs.
- Cut the dovetail tails and pins on the leg and top rail first.
- Shape the third piece (apron or side) to complete the three-way lock.
- Test-fit each component individually, then assemble the full corner dry.
- Adjust with chisels until all three pieces seat simultaneously without force.
Where to see this joint in Japan
- Fine furniture galleries — Kyoto and Tokyo — heirloom tables and cabinets
- Shrine fittings and altar work — Temple precincts — decorative frame corners
Variations
Thickness and dovetail angle vary with application. Some versions use a visible mitre; others hide the joint behind a flush face. Mitsu Kude (three-way frame joint) addresses similar geometry at architectural scale.
Applications
- Table construction
- Cabinet corners
- Shrine fittings
- Heirloom furniture
Tools required
- Dozuki saw
- Nomi chisels
- Marking knife
- Angle jigs
- Wood mallet