Yes, traditional samurai swords, including the katana, are typically constructed with a full tang. A full tang refers to a blade that extends through the handle of the sword, providing structural integrity and strength. It means that the blade and the tang are made from a single piece of steel.

In a traditional samurai sword, the tang extends from the base of the blade and runs through the entire length of the handle. The handle is then fitted with two halves of a hilt, which are secured to the tang. The tang is often covered by a wrapping of cord, such as tsuka-ito, to provide a comfortable and secure grip.

The full tang construction is crucial for ensuring the durability and balance of the sword. It helps distribute the forces generated during cutting or thrusting evenly along the entire length of the sword, making it more reliable and resistant to potential breakage.

The tang also plays a role in the overall balance of the sword, contributing to its handling and maneuverability. A well-constructed full tang enhances the overall functionality and performance of the sword.

However, it's worth noting that not all modern replicas or decorative swords labeled as "samurai swords" may have a full tang. When considering the purchase of a samurai sword or any sword claiming to be traditional, it is advisable to consult reputable sources or seek guidance from knowledgeable sword dealers or experts who can verify the construction and authenticity of the sword in question.

Always prioritize safety and familiarize yourself with the laws and regulations regarding sword ownership and usage in your jurisdiction.