What is a Katana? Katana Sword

Few things are as emblematic of Japan as the legendary Katana. Its sexy silhouette masks the rich culture and heritage forged into every square centimeter of the sword. 

A Samurai’s trusted weapon, the Katana has evolved into one of the world’s most magnificent works of art, a status symbol, and an enduring legacy of Japan’s colorful past. But, what is a Katana?

Join us in this article in exploring the mythical Katana, its history, and how the sword symbolized the unwavering Samurai spirit.

What is a Katana?

Creating an accurate Katana description requires appreciating the word’s origins. 

The 8th-century AD Chronicles of Japan (Nihon Shoki) was the first document to show the existence of the term “Katana.” Japan’s second oldest classical history book described the sword as having a one-sided (“kata”) blade (na”). The description differentiates it from another Japanese sword, the “Tsurugi,” which featured a double-sided or double-edged blade.

The iconic Katana curve is more refined or less pronounced than the older saber-like “Tachi.” Its blade extends at least 23.86 inches or 60.6 centimeters from the guard (“tsuba”) to the tip. Handling the Katana is also more secure and stable, thanks to its exceptionally long handle that can accommodate two hands.

Drawing the Katana from its “saya” or scabbard is flawless. The Samurai were revered for their slashing skills, able to cut down enemies in one swift stroke of the Katana. This action is possible because the Katana sharp edge faces upwards. 

And because the Katana symbolizes the Samurai, it didn’t take long for the rest of the world to call this Japanese sword “Samurai sword.”

what is a katana

A Katana on display. 

Attributes of a Katana

The elegant and historic Katana doesn’t only symbolize Japan and its fabled Samurai culture. It’s a work of art no other culture can match or replicate. However, a Katana isn’t one if it does not possess the following characteristics.

  • A moderately curved blade

A distinguishing Katana feature is its moderately curved blade. For those unfamiliar with the Katana vs Tachi debate, the latter has a more pronounced curvature. The Katana blade features four essential characteristics, the sori, hamon, jigane, and jihada. 

  • Sori (the blade’s curvature)

Only a master Japanese swordsmith (Katana-kaji) can define the Katana sword curvature (known as “Sori”). Swordsmiths can position the shallow curvature in the blade’s center, near the sword’s hilt, or closer to the blade’s tip.

Experts draw an imaginary line from the Katana hilt to the blade’s tip. They then measure the distance between this imaginary line and the Katana backside (the blunt side). The average Katana curvature or “sori” is about 0.6 inches or 1.5 centimeters.

  • Hamon (the temper line pattern)

Looking at a Katana blade, one will see its distinct two-shaded design. A product of centuries-old tempering, the “hamon” demarcates the division between the blade’s “soft” spine and the “hard” slashing edge. This unique combination allows the Katana sword to resist breaking and chipping while guaranteeing razor sharpness for greater precision.

Although most people think the classic wavy “hamon” pattern is the best, other Katana temper lines exist. They include clouds, arcs, and more. However, the uneven, rugged, and wild look of the “hitatsura”  is beyond comparison.

A Katana’s temper lines or “Hamon.”

  • Jigane (the blade’s surface)

Contrary to what Hollywood filmmakers portray, a Katana blade isn’t reflective. It’s also darker than other steel, thanks to the charcoal-like colors of Katana’s fundamental material – Tamahagane’s satetsu or iron sand. Hence, the two-toned Katana has a dark-gray spine and a light-gray (almost whitish) edge. 

  • Jihada (grain patterns)

These grain patterns are almost similar to the unique and ornate patterns of a Damascus blade. The “Jihada” results from the intricate and laborious process of heating, hammering, and folding Tamahagane steel, creating swirls, waves, and linear grain patterns. Sometimes, the “Jihada”  features a combination of different motifs.

  • A standard Japanese sword size

Traditional Japanese swordsmiths (Katana-kaji) still use the ancient system of measurement their ancestors derived from the Chi measurement of ancient China – the “Shaku.” One “shaku” roughly equates to 10/33 meters or 30.3 centimeters (about 11.93 inches).

The Katana length should be at least 2 “shaku” or 60.6 centimeters or 23.86 inches from the Katana blade tip to the Katana base (next to the sword guard and excluding the tang).

  • The Katana Tsuka (Hilt)

Most people recognize the “hilt” as the sword’s handle. However, experts don’t use the term, preferring to call this sword section “hilt.” The Katana hilt is the “Tsuka,” consisting of the “Tsuba” and other fittings.

  • Tsuba (Katana guard)

The Katana sword guard does not only protect the hands against accidental cuts from the razor-sharp blade. It also has a decorative function, allowing the Katana sword to stand out as a work of art.

Although most Katana sword guards are circular, some are rectangular but with rounded corners. The “Mokko” is a unique Tsuba style because it features four distinct lobes. Meanwhile, the Sukashi Tsuba offers an ornate cutout design, making it better in a display than in a battle.

  • Kashira and Fuchi

Next to the Katana sword guard is the Fuchi collar, while the pommel features the Kashira. These metal fittings can be as ornate as the Tsuba without undermining their fundamental purpose. You will also recognize the metallic Menuki decorative piece underneath the Katana hilt wrapping. 

what is a katana

A Katana with ornate dragon-motif for the Tsuba. Photo by Sword Encyclopedia.

  • Wooden Saya (The Scabbard)

The Samurai sword has a razor-sharp edge, making it necessary to protect the wearer from accidental cuts. Hence, artisans also create a special scabbard (the “Soya”) for the Katana. A “Shirasaya” features wood, while a “Koshirae” has metal ornaments adorning the lacquered scabbard. 

Elements of a Katana

People who see a Katana for the first time cannot help but admire the sword’s beauty. Sword collectors globally describe the Katana as the most perfect, elegant, and effective hand-held weapon humankind has ever created. Three Katana elements are crucial to call a Katana a Katana.

Artistic Beauty

The Katana blade alone is sufficient to draw admiration from people viewing the Japanese sword. Although Damascus blades also feature unique wave patterns and other artistic designs, nothing can surpass the Katana blade’s simplistic elegance. If other blades scream for attention, the Katana does so in silence.

One can only commend the dedication and commitment of Japanese swordsmiths (Katana-kaji). It’s not easy to make authentic Japanese Katana because the laws and regulations related to the sword’s manufacture are strict. It takes decades before a swordsmith apprentice can master the intricacies of Katana making.


Although more modern metals are stronger than the iron used for making Katana, Tamahagane remains a solid material for the revered Japanese sword. In the hands of an expert Katana-kaji, the Katana can split an enemy in two with a single stroke. Of course, the results would still hinge on who wields the Katana. 


An expert swordsman can split a single strand of human hair with the Katana’s razor-sharp edge. That’s how accurate this Japanese sword can be. However, its precision-cutting still hinges on the wielder of the sword.

katana sword

An elegant Samurai sword on display. Photo by Just Fun Facts.

History of the Katana

Knowing the Japanese Samurai sword requires appreciating its history. 

  • Heian Period 

Between 782 and 1184, the “Chokuto” traditional Japanese straight sword was proving ineffective in battle as warriors began waging battles on horseback instead of on foot. One of the Emperor’s swordsmiths, “Amakuni, proposed redesigning the sword, giving birth to the Tachi – a single-edged curved sword. The Tachi laid the foundation for the Katana.

  • Muromachi Period 

An intense military struggle highlighted this era (1338-1573 AD), which locals call the “Sengoku.” With many warring factions, swordsmiths improved the Tachi’s design to make it quicker on the draw. Hence, the Samurai warriors of this period used the “Uchigatana,” revered for its speed and precision. Katana-kajis forged two Uchigatana swords – one short and one long. The shorter sword became the “Wakizashi,” while the longer version became the Katana. It wasn’t uncommon for the Samurai to carry both Uchigatana sword types.

samurai warriors

Samurai warriors. Photo by Britannica.

  • Momoyama Period 

Between 1574 and 1600, Katana-kajis started adding ornaments to the Uchigatana, such as precious metals and lacquer. Heavily decorated Uchigatanas became the perfect gifts to “Hatamotos” or high-ranking Samurais.

  • Edo Period 

The Samurai class began wearing the Wakishazi short Uchigatana and the long-bladed Katana as a set between 1603 and 1867. People call the Uchigatana combination “daisho.” Samurais who wear “daisho” at formal events and ceremonies must adhere to regulations.

  • Meiji Period 

By 1876, carrying the Katana and other Japanese swords in public became illegal as the Meiji government sought to modernize its military. The Hatorei edict saw the demise of the Katana as a combat weapon, relegating its function to ceremonies and as gifts. 

The Katana in the 21st Century

Although the Katana symbolizes Japan, not all can own one. The Japanese government requires its citizens to purchase a Katana with verifiable historical or cultural significance. They can only buy Katana from licensed Katana-kajis. Aspiring Katana owners must also register the Samurai sword with the “Nihon Token Hozon Kai” to secure a permit and certificate of authenticity. 

In Japan, one cannot carry a Katana in public, even with a permit, as stipulated in the Firearm and Sword Possession Control Law. The Samurai sword is only for display in one’s house. 

The Bottom Line

Although the Katana is no longer used in combat, its legendary status and unmatched beauty remain a powerful magnet for sword enthusiasts worldwide. Its sleek and moderately curvaceous look and stunning blade design make this sword THE most sought-after bladed weapon in human history.


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