Sword Mountings & Fittings
Koshirae & Tosōgu
The art of the Japanese sword mounting and its fittings — a distinct field of collecting and study where metalwork, lacquer, and braid converge.
What Are Koshirae and Tosōgu?
Koshirae (拵) refers to the complete mounting of a Japanese sword — the scabbard (saya), handle (tsuka), handguard (tsuba), and all associated fittings assembled together as a functional and aesthetic unit. A koshirae is not merely a container for the blade; it is a coordinated work of decorative art.
Tosōgu (刀装具) is the collective term for the individual metal fittings — tsuba, menuki, fuchi-kashira, kozuka, kōgai, and seppa. These fittings are often studied, collected, and appreciated independently of the swords they were made for.
When a blade is not in use, it may be stored in a plain wooden shirasaya (storage scabbard) without decorative fittings. The distinction between koshirae (decorative mounting) and shirasaya (storage mounting) is fundamental in sword care.
The Components
Each component of the koshirae is made by a specialist craftsperson:
Tsuba
The handguard. A disc or plate separating the blade from the handle. Tsuba are collected as independent art objects, with schools, periods, and styles of their own.
Menuki
Small decorative ornaments placed beneath the handle wrapping. Originally to improve grip, now primarily aesthetic. Often depict animals, plants, or symbolic motifs.
Fuchi-Kashira
The matching pair of collar (fuchi) and pommel cap (kashira) at the handle ends. Often decorated as a matched set with a shared theme.
Kozuka
A small utility knife fitted into a pocket on the tsuba. Its handle is often finely decorated and collected separately.
Kōgai
A hairdressing or multipurpose tool carried in the tsuba alongside the kozuka. Sometimes elaborately decorated.
Seppa
Thin metal spacers on either side of the tsuba, ensuring proper fit and alignment within the mounting.
Habaki
The wedge-shaped collar that locks the blade in the scabbard and secures the mounting assembly. Made by a specialist habaki maker.
Saya
The scabbard, typically lacquered wood. May feature maki-e (gold/silver decoration), mother-of-pearl, or other finishes.
Sageo
The cord attached to the scabbard, used to secure it to the belt. Tied in various functional and decorative knots.
Tsuka-ito
The silk or leather braid wrapped around the handle over the ray skin. Wrapping patterns (tsukamaki) are a specialized craft.
Samegawa
Ray skin wrapped around the wooden handle core, providing a textured grip surface beneath the tsuka-ito.
Fittings as a Distinct Art Form
Japanese sword fittings constitute a major field of decorative art, parallel to and independent from the study of blades. The tsuba alone has dozens of recognized schools — Goto, Myōchin, Tsuchiya, Kaneie, Nobuie, Higo, and many others — each with distinctive styles, materials, and techniques.
Fittings were made from a wide range of materials: iron (tetsu), soft metals (shakudō, shibuichi, copper, silver, gold), and incorporated techniques such as takabori (high relief carving), zōgan (inlay), sukashi (openwork), and nunome (textile-pattern overlay). The patination of metals — the deep blues, browns, and purples of well-treated shakudō and shibuichi — is itself a highly refined art.
Many fittings bear signatures (mei) and can be attributed to specific artists, schools, and periods. Major fittings may hold NBTHK or NTHK papers, just as blades do. The study of tosōgu is a rich field that can be pursued independently of sword collecting.
Common Themes and Motifs
The decoration of fittings draws from a vast repertoire of themes drawn from Japanese culture, religion, and the natural world:
These themes were not merely decorative. They conveyed meaning — loyalty, longevity, courage, scholarly refinement, or devotion — and the choice of motif often reflected the owner's identity, aspirations, or the intended use of the sword.
Collector's Note
Fittings may have independent value from the blades they accompany. A tsuba or a set of menuki can be a significant artwork in its own right, with its own papers, provenance, and market. Key considerations for collectors include:
- School and artist — Attribution to a recognized school or individual smith
- Period — Fittings from the Momoyama and early Edo periods are especially prized
- Condition — Patina, surface integrity, and absence of damage or inappropriate cleaning
- Papers — NBTHK or NTHK authentication adds confidence and value
- Provenance — Documented ownership history
- Rarity — Unique designs, unusual themes, or work by famous artists
Fittings should be handled carefully — oils from skin can affect patina, and improper cleaning can damage surfaces. Store in appropriate fittings boxes (kiribako) with proper humidity control.