What exactly defines an aikuchi compared to a standard tanto?
Updated Feb 2026
An aikuchi is a specific mounting style rather than a blade type. The defining characteristic is the total absence of a tsuba (hand guard), so the kashira end of the handle meets the koiguchi — the mouth of the scabbard — flush and without interruption. A standard tanto may feature a small round or square tsuba, but an aikuchi eliminates it entirely, resulting in an exceptionally sleek, compact profile. Historically, aikuchi mountings were favored for blades carried concealed beneath robes or for formal court settings where a visible guard was considered unnecessary. The streamlined silhouette also makes aikuchi pieces particularly striking as display collectibles, since the eye travels along one continuous line from pommel to saya tip.