Habaki, Koiguchi, and Sword Fitting Craftsmen: The Art of Japanese Sword Metalwork

The Role of Japanese Sword Fitting Craftsmen

A Japanese sword consists of the blade (including the tang, or nakago) and the koshirae (mounting). The koshirae incorporates numerous metal fittings, and the craftsmen who specialize in producing these fittings are collectively called kanagu-shi (metal fitting craftsmen) or tosougu-shi (sword fitting craftsmen).

Sword fittings serve both practical and artistic functions. After the Edo period, as peace replaced warfare, the sword transformed from weapon into "wearable art embodying the samurai aesthetic," and the design and craft of fittings developed into an independent field of decorative art.

Major Types of Fittings and Their Craftsmen

Habaki-shi (Habaki Makers)

The habaki is a metal collar fitted between the blade and the scabbard mouth to prevent the blade from falling out. It serves both a securing function and a decorative one at the base of the blade.

Materials: Gold, silver, shakudo (copper-gold alloy), suaka (pure copper), shibuichi, brass Techniques: Tankin (hammered metalwork), chokin (engraving), zogan (inlay), kinkise (gold overlay)

Habaki makers work closely with swordsmiths and polishers, measuring the nakago dimensions precisely for a custom fit—demanding both high precision and deep materials knowledge.

Tsuba-shi (Tsuba Makers)

The tsuba is a round or oval guard positioned between the grip and the blade. On katana-style mountings, it is used in combination with the seppa (spacer washers).

Historical Schools and Production Centers:

• Nanban-tsuba: Openwork guards influenced by 16th-century Portuguese and Spanish styles
• Higo-tsuba: Austere, warrior-aesthetic guards favored by Higo domain retainers
• Edo-tsuba: Elaborately engraved and inlaid decorative guards
• Kyo-sukashi-tsuba: Elegant openwork guards preferred by court nobles and daimyo

Many modern tsuba makers work as independent artist-craftspeople, with numerous exhibiting at NBTHK sword fittings exhibitions.

Menuki-shi (Menuki Makers)

Menuki are small decorative elements embedded beneath the grip wrapping (tsuka-ito), combining a non-slip function with ornamental beauty.

Subjects: Dragons, hawks, waves, flowers and birds, weapons, three-leaf hollyhock (Tokugawa crest), and many others Techniques: Casting, tankin, chokin, zogan (in gold, silver, shakudo, shibuichi, etc.)

The menuki maker's craft combines precision casting with engraving. The Goto family dominated the field for generations during the Edo period with a closely guarded technical tradition.

Kozuka-shi (Kozuka Makers)

The kozuka is the grip of a small utility knife stored in a pocket on the outside of the scabbard. It functions as a practical tool while serving as a canvas for exquisite metalwork artistry. Fine specimens command prices of hundreds of thousands to over a million yen for the grip alone.

Summary of Key Techniques

The Modern Craftsman Situation and Training Challenges

The population of sword fitting craftsmen is even smaller than that of swordsmiths or polishers—estimated at only a few dozen nationwide. Succession is a critical concern, and technical transmission is becoming increasingly difficult.

Main training pathways include:

• Metalwork programs at Tokyo University of the Arts, Kanazawa College of Art, and similar institutions
• Apprenticeship in a workshop (finding a willing master is the greatest challenge)
• Workshops organized by NBTHK and regional sword societies

Sword fittings are a significant factor in authentication and valuation, and the quality (or absence) of good fittings has a major impact on a sword's sale price.

Summary

Sword fitting craftsmen are the unsung heroes of the Japanese sword's artistic completeness. Despite being as important as swordsmiths and polishers, they receive far less recognition. The preservation of their skills is one of the most urgent challenges facing modern nihonto culture.