Yes, traditional katanas have a full tang. The term "tang" refers to the portion of the blade that extends into the hilt (tsuka) of the sword. A full tang means that the tang extends throughout the entire length of the hilt, ensuring structural integrity and providing strength and balance to the sword.

In the case of a katana, the tang extends from the tip of the blade (kissaki) all the way to the end of the handle. The tang is typically covered by the hilt, which is secured with a tightly wrapped cord known as the tsuka-ito. The hilt is further reinforced by two wooden pieces called mekugi, which are inserted through corresponding holes in the tang to secure the hilt in place.

The full tang design is crucial for the functionality and durability of the katana. It allows for a secure grip and helps distribute the force of a strike evenly through the entire sword, making it less prone to breakage or damage during combat. The construction of a full tang also provides a solid foundation for the overall balance and handling of the sword.

It's worth noting that while traditional katanas have a full tang, there may be variations or modern interpretations of the sword that deviate from the traditional construction. However, for an authentic and traditional katana, a full tang is a fundamental characteristic.