Katana tang (Nakago)
A nakago (katana tang) is the part of the katana blade that extends into the handle. In other words, the nakago is the section of the katana tang that protrudes from the base of the handle.
The katana tang is an important part of the katana blade, and helps to give the blade strength and stability. A katana with a weak or damaged tang can be very dangerous to use.
Katana tang length
As with other swords, the length of the katana's tang varied depending on the era and region in which it was made. Generally speaking, however, the katana's tang tended to be longer than that of other sword types. This was likely due to the fact that the katana was designed to be used with two hands, which required a longer tang in order to balance the blade properly. The extra length also gave the katana more leverage, making it a more powerful weapon.
Today, most katanas have a tang that is about 1/3 the length of the blade. This is just long enough to provide balance and allow for proper two-handed grip, without adding too much weight to the sword. Some katanas, however, do have longer tangs. These swords are usually heavier and more difficult to wield, but they can be quite powerful in the hands of a skilled user.
The length of the katana's tang is just one of the many factors that contribute to the sword's overall performance. When choosing a katana, it is important to consider all the features that make up the blade, in order to find the sword that is best suited for your needs.