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Hado Shiosai Ko-Bunka 135mm Japanese knife with SG2 stainless steel blade
  • Hado Shiosai Ko-Bunka 135mm Japanese knife with SG2 stainless steel blade
  • Close-up of SG2 tsuchime blade on Hado Shiosai Ko-Bunka Japanese knife
  • Side profile of Hado Shiosai Ko-Bunka handcrafted in Sakai, Japan
  • Choil close-up showing refined grind on Hado Shiosai Ko-Bunka knife
  • Handcrafted Hado Japanese knife made in Sakai City, Osaka, Japan
  • Hado Shiosai Ko-Bunka 135mm Japanese knife with SG2 stainless steel blade
  • Close-up of SG2 tsuchime blade on Hado Shiosai Ko-Bunka Japanese knife
  • Side profile of Hado Shiosai Ko-Bunka handcrafted in Sakai, Japan
  • Choil close-up showing refined grind on Hado Shiosai Ko-Bunka knife
  • Handcrafted Hado Japanese knife made in Sakai City, Osaka, Japan
HADO Shiosai Ko-Bunka Urushi Oak Handle // 135mm

HADO Shiosai Ko-Bunka Urushi Oak Handle // 135mm

$254.00 USD
Shipping calculated at checkout.

The Hado Shiosai Ko-Bunka 135mm is a compact, high-performance Japanese knife designed for precision, control, and refined cutting tasks. As a smaller version of the Bunka, the Ko-Bunka features a sharp k-tip profile and a shorter blade length, making it exceptionally maneuverable for fine slicing, detail work, and small ingredients where accuracy matters most.

Originally developed as a more agile evolution of the traditional Bunka, the Ko-Bunka delivers the same versatility in a tighter, more controlled format—ideal for professional chefs, serious home cooks, and anyone looking to add a precision-focused Japanese knife to their lineup.

This knife is part of Hado’s Shiosai line, a series deeply rooted in tamashii (魂)—the soul of craftsmanship. “Shiosai,” meaning the sound of the tide, is reflected in the blade’s geometric tsuchime hammering, soft kasumi finish, and polished edge, creating a subtle yet striking visual texture inspired by light on water.

Built with stainless cladding and an SPG2 (Super Gold 2) core, this knife offers outstanding edge retention, excellent corrosion resistance, and consistent sharpening performance thanks to its powder metallurgy construction. SPG2 is prized for maintaining a razor-sharp edge while remaining durable and low maintenance—ideal for daily professional use.

Finished with a urushi-lacquered oak handle, the knife feels perfectly balanced in hand, offering comfort, stability, and precise feedback during extended prep. Each blade is meticulously sharpened by Tadataka Maruyama, Naohiro Nomura, and Takafumi Tsuda, ensuring exceptional cutting performance straight out of the box.

Handcrafted in Sakai City, Osaka, this Ko-Bunka is an outstanding choice for those looking to buy a premium Japanese kitchen knife that blends artistry, performance, and everyday usability.

-DESCRIPTION-

  • Shape - Ko-Bunka

  • Blade length - 135mm

  • Blade Height - 45.5mm

  • Blade Thickness - 2mm

  • Weight - 113.9g

  • Blade Construction - San Mai

  • Cladding - Stainless Tsuchime

  • Steel Type - SPG2

  • Rockwell Hardness - 63 HRC

  • Handle - Urushi Oak

  • Made in - Sakai City, Osaka, Japan

  • Brand - Hado

Composition of SPG2 (Super Gold 2) Steel

  • Carbon (C): 1.25–1.45% (Enhances hardness and edge retention)

  • Chromium (Cr): 14–16% (Provides corrosion resistance and wear resistance)

  • Molybdenum (Mo): 2–3% (Improves toughness and enhances resistance to pitting and corrosion)

  • Vanadium (V): 1.8–2.2% (Contributes to grain refinement, edge retention, and wear resistance)

  • Manganese (Mn): 0.40% (Enhances strength and hardenability)

  • Silicon (Si): 0.50% (Adds toughness and improves overall durability)

Key Features of SG2 Steel:

  • Powder metallurgy construction results in a fine, uniform grain structure, making it extremely sharp and easy to maintain.

  • High hardness (HRC 62-64) offers exceptional edge retention.

  • Excellent corrosion resistance, making it a great choice for kitchen knives.

  • Tougher than many other high-hardness steels, reducing chipping risk.

SG2 is a premium stainless steel, often used in high-end Japanese knives for its outstanding balance of sharpness, durability, and ease of maintenance.