Tantō with signature (Mei) of Kunimitsu. Complete aikuchi style koshirae (mountings) and bare blade.
|Blade length||avg. 15–30 cm (5.9–12 in)|
|Blade type||Double or single edged, straight bladed|
A tantō (短刀, "short sword") is one of the traditionally made Japanese swords (nihonto) that were worn by the samurai class of feudal Japan. The tantō dates to the Heian period, when it was mainly used as a weapon but evolved in design over the years to become more ornate. Tantō were used in traditional martial arts (tantojutsu) and saw a resurgence of use in the West in the 1980s as the design made its way to America and is a common blade pattern found in modern tactical knives.
The tantō is commonly referred to as a knife or dagger. The blade is single or double edged with a length between 15 and 30 cm (6-12 inches, in Japanese 1 shaku). The tantō was designed primarily as a stabbing weapon, but the edge can be used for slashing as well. Tantō are generally forged in hira-zukuri style (without ridgeline), meaning that their sides have no ridge line and are nearly flat, unlike the shinogi-zukuri structure of a katana. Some tantō have particularly thick cross-sections for armor-piercing duty, and are called yoroi toshi. Tantō were mostly carried by samurai, as commoners did not generally wear them. Women sometimes carried a small tantō called a kaiken in their obi primarily for self-defense. Tantō were sometimes worn as the shōtō in place of a wakizashi in a daishō, especially on the battlefield. Before the advent of the wakizashi/tantō combination, it was common for a samurai to carry a tachi and a tantō as opposed to a katana and a wakizashi.
It has been noted that the tachi would be paired with a tantō and later the uchigatana would be paired with another shorter uchigatana. With the advent of the katana, the wakizashi eventually was chosen by samurai as the short sword over the tantō. Kanzan Satō in his book The Japanese sword notes that there did not seem to be any particular need for the wakizashi and suggests that the wakizashi may have become more popular than the tantō due to the wakizashi being more suited for indoor fighting. He mentions the custom of leaving the katana at the door of a castle or palace when entering while continuing to wear the wakizashi inside.
History of Tantō in Japan 
Heian to Muromachi 
The tantō was invented partway through the Heian period, when it was mainly used as a weapon. With the beginning of the Kamakura period, tantō were forged to be more aesthetically pleasing, and hira and uchi-sori tantō were the most popular styles for wars in the kamakura period. Near the middle of the Kamakura period, more tantō artisans were seen, increasing the abundance of the weapon, and the kanmuri-otoshi style became prevalent in the cities of Kyoto and Yamato. Because of the style introduced by the tachi in the late Kamakura period, tantō began to be forged longer and wider. The introduction of the Hachiman faith became visible in the carvings in the tantō hilts around this time. The hamon (line of temper) is similar to that of the tachi, except for the absence of choji-midare, which is nioi and utsuri. Gunomi-midare and suguha are found to have taken its place. In Nambokucho, the tantō were forged to be up to forty centimeters as opposed to the normal one shaku (about thirty centimeters) length. The tantō blades became thinner between the uri and the omote, and wider between the ha and mune. At this point in time, two styles of hamon were prevalent: the older style, which was subtle and artistic, and the newer, more popular style. With the beginning of the Muromachi period, constant fighting caused the mass production of blades, meaning that with higher demand, lower-quality blades were manufactured. Blades that were custom-forged still were of exceptional quality, but the average blade suffered greatly. As the end of the period neared, the average blade narrowed and the sori became shallow.
Momoyama to the Early Edo Period 
Approximately two hundred fifty years of peace accompanied the unification of Japan, in which there was little need for blades. With weapon smiths given this time, both the katana and wakizashi were invented, taking the place of the tantō and tachi as the most-used pair of weapons, and the number of tantō forged was severely decreased. The only tantō produced during this period of peace were copies of others from earlier eras.
Late Edo Period 
There were still few tantō being forged during this period, and the ones that were forged reflected the work of the Kamakura, Nambokucho, or Muromachi eras. Suishinshi Masahide was a main contributor towards the forging of tantō during this age.There are now only prehistoric tantō's being used in combat.
Meiji to present 
Many tantō were forged before World War II, due to the restoration of the Emperor to power. Members of the Imperial Court began wearing the set of tachi and tantō once more, and the number of tantō in existence increased dramatically. After world War II, a restriction on sword forging caused tantō manufacture to fall very low. American and European interest in Japanese martial arts since the war created a demand for the tantō outside Japan from the 1960s through the present time.
Types of Tantō 
Tantō blade types 
- Shinogi: This is not a true tantō, for it is usually created when a longer sword has been broken or cut. Tantō are seldom made in this form.
- Kanmuri-otoshi: These tantō had a single edge and a flat back. They had a shingoni that extended to the tip of the blade and a groove running halfway up the blade. It was very similar to the unokubi style tantō.
- Kubikiri: Kubikiri are rare tantō with the sharpened blade on the inside curve rather than the outside. One interesting fact about kubikiri is that they have no point, making them difficult to use in battle and enshrouding the weapon in mystery. Kubikiri can be roughly translated to “head cutter”. According to one myth, they were carried by assistants into battle in order to remove the heads of the fallen enemies as trophies for the warriors to show off during the triumphant return from battle. There are other speculations existing about the kubikiri’s possible uses. Perhaps they were used by doctors or carried by high-ranking officials as a badge is worn today. They could also have been used for cutting charcoal or incense, or used as an artistic tool for pruning bonsai trees.
- Shobu: The shobu is a commonly found blade type that is very similar to the shinogi. It is sometimes found with a groove running halfway up the blade.
- Kogarasumaru: The kogarasumaru is a very rare blade type that appears to be a branch of the shinogi blade type. The front third of the blade is double-edged.
- Kissaki-moroha: The kissaki-moroha features an extremely long o-kissaki. This means that it is much longer than the one shaku length of the average tantō.
- Unokubi: The unokubi is an uncommon tantō that features a single sharpened edge and a flat back. There is normally a short, wide groove extending to the midway point on the blade.
- Hira: The hira is a tantō form with no shinogi and a mune. It is extremely common due to the simplicity of its design.
- Hochogata: The hochogata is a tantō form that is commonly described as a short, wide, hira. The hochogata was one of the tantō forms that Masamune (an ancient sword smith whose name has become legend) favored.
- Katakiriha: The katakiriha is a tantō form that has one side that is completely flat, while the other side turns at a sharp angle to create a chisel-shaped blade.
- Moroha: The moroha is a rare, double bladed tantō type that has a diamond-shaped cross-section. The blade tapers to a point and contains a shinogi that runs to the point.
- Yoroi toshi or yoroi doshi, tantō that have particularly thick cross-sections for armor-piercing duty.
Tantō Koshirae 
- Aikuchi: The aikuchi is a tantō koshirae where the fuchi is flush with the mouth of the saya. There is no tsuba on this form of tantō. Aikuchi normally have plain wood tsuka, and many forms of aikuchi have kashira that are made from animal horns.
- Hamidashi: The hamidashi is a tantō koshirae that features a small tsuba.
Other tantō 
- Kaiken tantō: The kuaiken (also kwaiken or futokoro-gatana) is a generally short tantō that is commonly carried in aikuchi or shirasaya mounts. It was useful for self-defense indoors where the long katana and intermediate wakizashi were inconvenient. Women carried them in the obi for self-defense and rarely for jigai (suicide). A woman received a kaiken as part of her wedding gifts.
- Fan Tantō: The fan tantō is a common tantō with a blade entirely concealed within a fan-shaped scabbard. The blade was usually low quality, as this tantō was not designed to be a display piece, but rather a concealable dagger useful for self-defense.
- Yari Tantō: Japanese spearheads were often altered so that it became possible to mount them as tantō. Unlike most blades, yari tantō had triangular cross-sections.
- Ken tanto: This is also not truly a tantō, though it is often used and thought of as one. Ken were often used for Buddhist rituals, and could be made from yari (Japanese spearheads) that were broken or cut shorter. They were often given as offerings from sword smiths when they visited a temple. The hilt of the ken tantō may be found made with a vajra (double thunderbolt related to Buddhism).
- Modern tantō:Modern tactical knives have been made by knife makers Bob Lum, Phill Hartsfield, Ernest Emerson, Allen Elishewitz, Bob Terzuola, Strider Knives, Benchmade, Spyderco, Severtech, Ka-Bar, SOG Knives, and Cold Steel. These "American Tantō" designs feature a thick spine on the blade that goes from the tang to the tip for increased tip strength. The handle shape may be altered slightly to provide better ergonomics.
Use in martial arts 
Tantō with blunt wooden or blunt plastic blades are used to practice martial arts. Versions with a blunt metal blade are used in more advanced training and in demonstrations. Martial arts that employ the tantō include:
Japanese World War II police type tantō.
See also 
- The samurai sword: a handbook, John M. Yumoto, Tuttle Publishing, 1989 P.47
- Handbook to life in medieval and early modern Japan, William E. Deal, Oxford University Press US, 2007 P.161
- The Development of Controversies: From the Early Modern Period to Online Discussion Forums, Volume 91 of Linguistic Insights. Studies in Language and Communication, Author Manouchehr Moshtagh Khorasani, Publisher Peter Lang, 2008, ISBN 3-03911-711-4, ISBN 978-3-03911-711-6 P.150
- The Complete Idiot's Guide to World Mythology, Complete Idiot's Guides, Authors Evans Lansing Smith, Nathan Robert Brown, Publisher Penguin, 2008, ISBN 1-59257-764-4, ISBN 978-1-59257-764-4 P.144
- Styles in the Shape of Blades
- The Japanese sword, Kanzan Satō, Kodansha International, 1983 P.68
- Shotokan's Secret: The Hidden Truth Behind Karate's Fighting Origins, Bruce D. Clayton, Black Belt Communications, 2004 P106
- The Japanese sword, Kanzan Satō, Kodansha International, 1983 P.68
- Satō, Kanzan (1983). In Joe Earle. The Japanese sword; Volume 12 of Japanese arts library. Kodansha International. pp. 62–64. ISBN 978-0-87011-562-2.
- Satō (1983) p. 68
- Sinclaire, Clive (2004). Samurai: The Weapons and Spirit of the Japanese Warrior. Globe Pequot. p. 59. ISBN 978-1-59228-720-8.
- Steele, David (1981). "Japanese Daggers". Black Belt (Black Belt, Inc.) 19 (2): 55–60.
- Unusual tantō
- Pacella, Gerard (2002). 100 Legendary Knives. Krause Publications. pp. 124–126. ISBN 0-87349-417-2.
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