3-way hidden joint

 3-way hidden joint

This joint connects 3 pieces of wood at a single point in a hidden, or concealed manner. It results in a strong, seamless intersection.

Interlocking wedges or dovetails are cut into the mitered edges following the wood grain direction.

When assembled, these grain-engaged fittings lock the 3 components tightly together at the point.

Traditional applications included structural timber connections and architectural joinery where durability and concealment were important.

With no visible mechanical fasteners, it forms a robust knot by engaging the wood fibers.

Today this joint remains useful for wood furnishings, cases, and other projects requiring a hidden 3-way junction.

When crafted skillfully, the result is a seamless inside corner that conceals how the pieces are joined.

The hidden 3-way joint demonstrates the sophistication of traditional Japanese carpentry techniques.