What defines a tachi compared to a katana?

 Updated Mar 2026

The tachi predates the katana by several centuries and differs in three measurable ways. First, its nagasa (blade length) typically exceeds 70 cm, making it noticeably longer than a standard katana. Second, its sori (curvature) is deeper and positioned closer to the base of the blade rather than the center, giving it a more pronounced arc when viewed in profile. Third, and most visually striking for display purposes, the tachi was worn suspended edge-downward from the belt — the opposite of the katana's thrust-through-obi carry. This edge-down orientation is the historically correct way to display a tachi on a stand, and it changes the entire visual balance of the piece compared to how a katana would be presented.

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