Mitsu Kude 三組手

Assembly insights

Mitsu Kude encompasses several three-way corner variations, including Kane Tsugi (pinned corner mitre with two long tenons) and Kawai Tsugite (rotational symmetry joint). All require precise layout—often an 8×8 grid system—and careful chisel work to create interlocking tenons and mortises on three pieces. The result is a strong, seamless intersection that resists racking in multiple planes.

Historical context

Three-way joints have fascinated craftsmen across cultures. In Japan, Mitsu Kude appears in shrine fittings, decorative frames, and as a demonstration of mastery. The Kane Tsugi variation—a three-way pinned corner mitre—has been used in fine furniture and architectural details. Kawai Tsugite, with its clever rotational symmetry, has become popular as a woodworking puzzle and showpiece.

Construction steps

1. Establish an 8×8 grid (or equivalent) for consistent layout across all three pieces.
2. Mark the mitre faces and tenon/mortise positions on each component.
3. Cut the first piece: mitre faces and tenons (or mortises) as designed.
4. Transfer layout to the second and third pieces; cut to interlock.
5. Test-fit; adjust for snug assembly. All three pieces should lock together.

Where to see this joint in Japan

• Shrine and temple details — Japan — decorative frames and fittings

Variations

Kane Tsugi uses two long tenons on one piece fitting into mortises in the other two. Kawai Tsugite relies on rotational symmetry—two pieces with triangular pyramids removed from opposite corners can assemble in three orientations. The Chinese "rice dumpling" joint is a related double-tenoned lapping mitre.