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Tokyo Uchihamono
(Hand-Forged Blades)

29 Tokyo Uchihamono (Hand-Forged Blades)
Main Areas of Manufacture
Adachi Ward, Arakawa Ward, Taito Ward
Designation/Certification Dates
July 26th, 1989 (Tokyo Certification)
Traditional Technologies and Techniques
  1. During forge welding, borax is inserted between the ferrite and steel portions of the workpiece, then the materials are heated to approximately 900°C (1,652°F) and swiftly struck with a hammer in order to combine them. Care must be taken to avoid overheating the materials, as doing so may result in loss of steel content.
  2. Following heating in the forge, annealing is achieved by placing the workpiece in coal dust or straw ashes and allowing it to cool naturally.
  3. During quenching, a workpiece that has been heated in the forge to approximately 800°C (1,472°F) until it glows uniformly red is quickly cooled through submersion in water, this increases the blade's hardness.
  4. Following quenching, the blade is heated again at a low temperature in the forge to temper it while the craftsman monitors its surface appearance. This imparts suitable toughness to the blade.
Traditionally Used Raw Materials
Steel, ferrite
History and Characteristics

According to the Nihon Shoki, one of the oldest and most important chronicles of Japanese history, blacksmithing was first carried out in Japan in 583, when smiths were invited to Japan from the Korean Silla Kingdom during the reign of the Emperor Bidatsu (the 30th emperor of Japan, reigned 572-585). The Japanese supposedly learned how to forge steel from these visiting smiths.

Swordsmiths appeared as the samurai class rose to power. These craftsmen steadily improved their skills, eventually devising a method of forming blades with soft iron and attaching steel along the cutting edges. This created the soft yet sharp-cutting blades that are unique to Japan.

After Tokugawa Ieyasu established the Edo Shogunate in 1603, merchants moved to Edo from all over Japan. The names of metal casters and forging experts were also recorded among the lists of craftsmen who served the Shogunate.

The Edokanoko, one of the most informative general guidebooks to the city of the Edo Period, has a description about blacksmithing in relation to blades. It lists craftsmen who offered pointed carving knives (deba-bocho) that were formed through hammering. The guidebook tells us that swordsmiths also produced razors, kitchen knives and other bladed implements in addition to their main trade in swords.

Japan enjoyed a period of peace from the mid-Edo Period onward. During this time, an increasing number of swordsmiths changed their production focus, utilizing their smithing techniques to create the implements and blades needed for everyday life. In other words, many of them transformed themselves into town blacksmiths.

Following the fall of the Edo Shogunate and the Sword Abolishment Act of 1871, which prohibited ordinary people from carrying weapons, most of the remaining swordsmiths were forced to start making commercial and kitchen implements. They responded to the nation's Westernization (known as bunmei kaika, "the civilization and enlightenment movement") by applying their inherited skills to the manufacture of Western-style blades.

Contact Details
Manufacturing Area
Cooperative Name
Tokyo Cutlery Industrial Association
Address2-26-18-101 Narimasu, Itabashi Ward, Tokyo 175-0094
Telephone No.03 (6904) 1080
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