Kokurin Katana – Hand Forged T10 Sword with Real Choji Hamon & Black Wheel Tsuba

Kokurin Katana – Hand-Forged T10 Japanese Sword with Genuine Choji Hamon and Black Wheel Tsuba

The Kokurin Katana (黒輪), meaning "Black Wheel," is a distinctive handcrafted Japanese-style sword by HanBon Forge. Named after its striking matte black wagon-wheel tsuba, the Kokurin combines a hand-forged T10 high-carbon steel blade, genuine clay-tempered Choji hamon, Hazuya polishing, and an extended O-Kissaki with sophisticated black-and-gold Japanese-inspired fittings.

Its intricately pierced circular iron tsuba, premium black-and-gold braided tsuka-ito, and brilliant gold-flecked lacquered saya create a distinctive contrast between dark metalwork and warm golden tones.

The combination of a genuine Choji temper line, traditional blade geometry, full tang construction, and carefully coordinated koshirae makes the Kokurin an appealing choice for collectors, sword enthusiasts, and experienced practitioners who appreciate both craftsmanship and visual character.

Key Features of the Kokurin Katana

Hand-Forged T10 Steel Blade

At the heart of the Kokurin Katana is a blade crafted from T10 high-carbon tool steel, a material frequently selected for modern handcrafted Japanese-style swords.

T10 steel can develop a hardened cutting edge through appropriate heat treatment, making it suitable for blades featuring genuine differentially hardened hamon patterns.

The Kokurin blade is hand forged, shaped, clay hardened, oil quenched, and polished as part of its production process.

The completed blade features traditional shinogi-zukuri geometry, a defined yokote, an extended O-Kissaki, and a continuous surface without bo-hi.

Differential Clay Hardening

The Kokurin features genuine differential clay hardening, a heat-treatment process inspired by traditional Japanese swordmaking practices.

Before quenching, a clay coating is applied to selected areas of the blade. The coating influences cooling rates during the quenching process.

The resulting differences in steel microstructure between the cutting edge region and blade body produce the visible hamon along the blade.

Unlike an artificially applied decorative temper-line pattern, a genuine hamon reflects the blade's differential heat-treatment process.

Genuine Choji Hamon – Traditional Clove-Shaped Temper Line

One of the defining technical and aesthetic features of the Kokurin is its genuine Choji hamon.

The Japanese term Choji means "clove," and describes a pattern characterized by rounded, irregular formations resembling clove buds.

The flowing arrangement of the Choji hamon creates an expressive contrast against the straight geometry of the shinogi ridge.

The temper line is produced through differential heat treatment rather than being merely etched onto the finished blade.

Its natural variation adds individual character to each Kokurin Katana.

Hazuya Polishing

The blade receives Hazuya polishing, a finishing technique associated with traditional Japanese sword-polishing methods.

This approach helps refine the appearance of the hardened blade surface and makes the genuine Choji hamon more visually distinct.

Depending on lighting and viewing angle, different areas of the temper line may show varying degrees of contrast.

Traditional Shinogi-Zukuri Blade Geometry

The Kokurin follows the classic shinogi-zukuri blade configuration, recognized by its raised longitudinal ridge line.

This shinogi separates the main geometric surfaces of the blade, creating the familiar profile associated with Japanese katana.

Extended O-Kissaki

The blade features an O-Kissaki, a longer-than-standard Japanese-style sword tip.

The extended kissaki creates a distinctive appearance while maintaining the traditional geometric relationship between the blade body and tip section.

A defined yokote marks the transition into the kissaki.

Clean Blade Profile Without Bo-Hi

The standard Kokurin blade is made without bo-hi, the longitudinal groove sometimes found on Japanese swords.

The uninterrupted blade surfaces emphasize the polished steel, shinogi geometry, and genuine Choji hamon.

The absence of a groove also changes the blade's mass distribution compared with an otherwise similar grooved blade, although final balance depends on the entire sword.

Black Wagon-Wheel Iron Tsuba – The Signature of Kokurin

The centerpiece of the Kokurin Katana is its distinctive matte black wagon-wheel tsuba.

This round iron hand guard features a carefully arranged radial openwork pattern, with spoke-like sections and repeated openings around its center.

The design creates a layered, symmetrical appearance that resembles a traditional wheel.

Its matte black finish offers a restrained contrast to the reflective gold-flecked saya and black-and-gold handle wrapping.

Wagon-Wheel Design Inspiration

Wheel-shaped motifs appear in Japanese decorative arts and traditional metalwork.

Their circular geometry creates visual order through repetition, symmetry, and radial arrangement.

On the Kokurin, the wheel design provides the primary source of the sword's name and visual identity.

Rather than relying on elaborate gold decoration, the black iron tsuba uses its distinctive openwork structure to create character.

Matching Black Iron Fuchi and Kashira

The handle fittings include black iron fuchi and kashira with coordinated wave-inspired details.

The dark metal finish complements the wheel tsuba and creates a cohesive appearance across the handle mounting.

Gold-Colored Floral Menuki

Gold-colored flower menuki provide contrasting decorative accents beneath the black-and-gold tsuka wrapping.

Their warm metallic color complements the gold tones of the saya and handle cord.

Copper Habaki and Seppa

A copper habaki and coordinated copper seppa complete the blade-to-guard fitting assembly.

The copper tones provide subtle contrast against the matte black tsuba and fittings.

Premium Black and Gold Hineri-Maki Tsuka

The Kokurin features a distinctive two-tone black and gold tsuka-ito wrapped around a hardwood handle.

The alternating dark and warm gold-colored fibers create an intricate visual texture, making the handle one of the sword's most recognizable features.

Traditional Hineri-Maki Wrapping

The tsuka uses hineri-maki, a traditional Japanese-style handle wrapping technique.

The braided cord forms alternating diamond-shaped openings, exposing the genuine samegawa beneath.

The decorative black-and-gold pattern coordinates with both the matte black wheel tsuba and the shimmering golden saya.

Genuine Antiqued Samegawa

The hardwood tsuka core is covered with genuine antiqued rayskin (samegawa).

Its textured surface is visible through the diamond-shaped openings in the handle wrapping.

Together, the rayskin, braided cord, and metal fittings create a detailed traditional-style handle assembly.

Full Tang and Two Bamboo Mekugi

The T10 blade extends into the hardwood handle as a full-length tang (nakago).

Two bamboo mekugi pegs secure the handle assembly to the tang.

Correct fit and assembly are important elements of the construction of a functional Japanese-style sword.

Gold-Flecked Lacquered Saya

The Kokurin is accompanied by a distinctive gold-flecked lacquered wooden saya.

Its reflective golden surface features numerous fine flecks, creating a shimmering appearance under light.

This finish produces an eye-catching contrast with the matte black wagon-wheel tsuba and black iron handle fittings.

The golden saya also complements the warm gold threads woven through the tsuka-ito.

Bull Horn Koiguchi

The saya features a bull horn koiguchi at its opening.

The dark horn fitting provides a visual transition between the gold-flecked saya and the metal fittings of the sword.

Metal Kojiri

A metal kojiri completes the lower end of the saya.

Its dark finish provides another subtle contrast against the shimmering golden surface.

Light Beige Patterned Sageo

The scabbard is finished with a light tan and beige patterned woven sageo.

The decorative knot and hanging cord ends add a refined traditional-style detail to the complete mounting.

The beige cord provides a balanced contrast with the brilliant gold-flecked lacquer.

Kokurin Katana – Complete Product Specifications

Dimensions, Weight and Balance

The following dimensions describe the standard Kokurin Katana configuration.

Each sword is individually made, so minor differences in finished dimensions and weight may occur.

All dimensions and weights are approximate. Custom changes may affect the finished measurements and balance of the sword.

Balance, Handling and Intended Use

The Kokurin combines a 70.5 cm blade with a 27 cm two-handed tsuka, giving it proportions associated with a Japanese-style katana.

Its approximately 1.00 kg unsheathed weight, 2 cm blade curvature, and shinogi-zukuri geometry contribute to the physical characteristics of the sword.

The standard point of balance is approximately 14.7 cm from the measurement reference used for the listed configuration.

Actual handling characteristics depend on the sword's finished mounting and the experience and technique of the user.

The Kokurin is suited to private collections, Japanese sword appreciation, display, and appropriate supervised sword practice.

Sharpened swords should be handled only by responsible, appropriately trained adults in controlled environments.

Customize Your Kokurin Katana

HanBon Forge offers selected customization services for customers who want to personalize their Kokurin Katana.

Depending on production feasibility and compatibility, available options may include:

• Blade engraving: Names, text, selected symbols, or artwork.
• Tang inscription: A personalized mei can be requested.
• Tsuka-ito: Alternative handle wrapping colors and available materials.
• Tsuba and fittings: Selected compatible Japanese-style fittings.
• Saya: Alternative colors, lacquer finishes, and compatible designs.
• Blade edge: Sharpened or unsharpened options where available.

Browse our Japanese Sword Fittings Collection for additional fittings and customization ideas.

For more extensive changes, explore the Custom Katana Builder.

Engraving, alternative components, and other nonstandard modifications may involve additional charges or production time. Please confirm the details before ordering.

HanBon Forge Craftsmanship and Quality Control

HanBon Forge is based in Longquan, a region with a longstanding swordmaking heritage.

Our workshop produces handcrafted Japanese-style swords, including katana, wakizashi, tanto, and customized sword configurations.

The Kokurin combines hand forging, differential heat treatment, polishing, traditional-style handle construction, and decorative metal fittings.

Pre-Shipment Workshop Inspection

Before shipment, completed swords undergo inspection of relevant details, including:

• Blade appearance and visible finish.
• Hamon presentation and polishing.
• Tsuka assembly and fitting security.
• Tsuba, fuchi, kashira, and menuki placement.
• Saya seating and fit.
• Selected customization and finishing details.

HanBon Forge provides photographs of the completed sword for customer confirmation before shipment.

This allows customers to review the finished sword and selected fittings before dispatch.

What's Included with Your Kokurin Katana?

• 1 × Kokurin Hand-Forged T10 Katana with Gold-Flecked Wooden Saya
• 1 × Complimentary Sword Bag
• 1 × Sword Certificate

Accessory appearance may vary. The supplied certificate is not independent antique authentication or third-party sword grading.

Frequently Asked Questions