KIREAJI Blog About Japanese Knives

ZDP189 Japanese knife from Sakai City.

Unveiling the Excellence of ZDP189 Steel in Kni...

Unlock the full potential of your ZDP189 Japanese knife, renowned for its unparalleled sharpness retention and rust-resistant properties. Discover essential tips for using this special and rare knife, including how...

Unveiling the Excellence of ZDP189 Steel in Kni...

Unlock the full potential of your ZDP189 Japanese knife, renowned for its unparalleled sharpness retention and rust-resistant properties. Discover essential tips for using this special and rare knife, including how...

Sharpening Japanese knife from Sakai City.

Sharpened knives are more likely to cut your fi...

Discover the adjustments needed when transitioning to a freshly sharpened Japanese knife. Learn to navigate its newfound sharpness safely to avoid accidents and enjoy a more efficient and delightful cooking...

Sharpened knives are more likely to cut your fi...

Discover the adjustments needed when transitioning to a freshly sharpened Japanese knife. Learn to navigate its newfound sharpness safely to avoid accidents and enjoy a more efficient and delightful cooking...

Does your knife really have a sharp edge? You can check it with a certain vegetable.

Does your knife really have a sharp edge? You c...

Learn a quick and easy way to check the sharpness of your Japanese knife with the tomato test. If your knife struggles to cut through the end of a tomato,...

Does your knife really have a sharp edge? You c...

Learn a quick and easy way to check the sharpness of your Japanese knife with the tomato test. If your knife struggles to cut through the end of a tomato,...

Yanagiba Japanese knife from Sakai City.

How are the prices of Japanese kitchen knives d...

Explore the key factors that determine the price of Japanese kitchen knives, including craftsmanship, materials, construction, and manufacturing costs. Learn why investing in a high-quality Japanese knife is essential for...

How are the prices of Japanese kitchen knives d...

Explore the key factors that determine the price of Japanese kitchen knives, including craftsmanship, materials, construction, and manufacturing costs. Learn why investing in a high-quality Japanese knife is essential for...

Gyuto Japanese knife from Sakai City.

Unveiling the Gyuto: The Quintessential Japanes...

Discover the versatility and charm of Gyuto, the renowned Japanese chef's knife, often hailed as the ultimate all-purpose kitchen companion. From its sharp tip for delicate tasks to its curved...

Unveiling the Gyuto: The Quintessential Japanes...

Discover the versatility and charm of Gyuto, the renowned Japanese chef's knife, often hailed as the ultimate all-purpose kitchen companion. From its sharp tip for delicate tasks to its curved...

Japanese Knife forging process

The Art of Forging: Crafting the Finest Japanes...

Delve into the art of Japanese knife crafting, exploring the difference between forging and casting techniques. Discover how forging enhances sharpness and durability in traditional Japanese knives like Honyaki and...

The Art of Forging: Crafting the Finest Japanes...

Delve into the art of Japanese knife crafting, exploring the difference between forging and casting techniques. Discover how forging enhances sharpness and durability in traditional Japanese knives like Honyaki and...

The Evolution of Sakai Knives: A Legacy of Over a Thousand Years

  • Sakai City is renowned as one of Japan’s top cutlery-producing regions. However, the history of its blades extends far beyond kitchen knives. From iron tools in the Kofun period to swords, matchlock guns, tobacco knives, and eventually modern Japanese knives, Sakai's blacksmithing techniques have evolved over centuries.

  • Throughout history, Sakai’s craftsmen have continuously refined their skills, adapting to new demands and perfecting their techniques. This article explores how Sakai knives became globally recognized for their superior quality by tracing the transformation of metalworking techniques through the ages.

1. The Kofun Period: The Birth of Blacksmithing Culture

  • The origins of Sakai’s blacksmithing date back to the 5th century Kofun period, when massive burial mounds were constructed. These projects required a large number of iron farming tools and construction equipment, leading to the emergence of skilled blacksmithing communities in the region.

  • Advancements in Ironworking During the Kofun Period

    • Blacksmithing expertise from across Japan converged in Sakai, establishing a hub for metalworking.
    • Large-scale production of iron tools such as plows and hoes facilitated the construction of burial mounds.
    • The techniques for forging and shaping iron became the foundation for later weapon and knife manufacturing.

  • These ironworking techniques laid the groundwork for the development of sword-making and, eventually, Japanese kitchen knives.

2. The Heian to Sengoku Periods: The Rise of Swordsmithing

  • By the late Heian period, Sakai’s ironworking had evolved into sword-making, producing high-quality blades for samurai warriors. Sakai’s swordsmiths refined their techniques, developing methods that are still used in modern knife-making.

  • Advanced Swordsmithing Techniques in Sakai

    • Forging (Tanzo): Heating iron and steel to high temperatures and hammering them into shape.
    • Repeated Folding (Orikaeshi-Tanren): Folding and reforging steel multiple times to create a uniform and strong blade.
    • Precision Sharpening (Hazuke): Developing extremely sharp edges through meticulous polishing and grinding.

  • These advancements in swordsmithing directly influenced the craftsmanship behind Japanese kitchen knives, ensuring their legendary sharpness and durability.

3. The Sengoku Period: Matchlock Gun Manufacturing and Technical Innovation

  • In the 16th century, the introduction of matchlock guns (tanegashima) revolutionized warfare. Recognizing the power of firearms, Oda Nobunaga commissioned Sakai’s craftsmen to mass-produce matchlock guns, propelling Japan to become the world’s largest firearms manufacturer within just 30 years.

  • Technological Advancements from Matchlock Guns

    • Precision Metalworking: Techniques used to ensure straight, uniform gun barrels were later applied to knife blade crafting.
    • Metal Stretching Techniques: The ability to extend and shape metal for guns influenced the forging of longer, thinner blades.
    • Division of Labor System: The specialized, step-by-step manufacturing process for firearms became the basis for modern knife production.

  • The craftsmanship developed during this period contributed to the high-precision forging methods still used in Sakai’s cutlery industry today.

4. The Edo Period: The Birth of the Tobacco Knife and Its Impact on Japanese Knives

  • With the decline in demand for swords following the end of the Sengoku period, Sakai’s craftsmen shifted their expertise to everyday tools, most notably the tobacco knife.

  • What is the Tobacco Knife?

    When Portuguese traders introduced tobacco to Japan in the 16th century, finely cut tobacco leaves became popular. Sakai’s blacksmiths developed the tobacco knife (tabako-bocho) to precisely cut tobacco into thin, uniform strips.

  • Key Innovations from the Tobacco Knife

    • Superior Sharpness: Required to cut delicate tobacco leaves without crushing them.
    • Precision Sharpening Techniques: Ensured consistency in cutting, a skill later applied to kitchen knives.
    • Exceptional Durability: The need for long-lasting blades refined steel hardening techniques.

  • These innovations paved the way for the creation of Sakai’s world-class Japanese kitchen knives.

5. The Birth of the Modern Japanese Knife and Its Global Influence

  • Building on the skills developed through sword-making, gun production, and tobacco knife crafting, Sakai became the center of Japanese knife manufacturing during the Edo period. Today, the city is renowned for producing professional-grade Japanese kitchen knives, including the Yanagiba (sashimi knife) and Deba (fish-cutting knife).

  • The Characteristics of Sakai Knives

    • Inherited Techniques from Samurai Swords: Ensuring exceptional durability and sharpness.
    • Precision Metalworking from Matchlock Guns: Allowing for ultra-thin and razor-sharp blades.
    • Fine Sharpening Techniques from Tobacco Knives: Delivering superior cutting performance.

  • Today, over 90% of professional chefs in Japan use Sakai knives, and they are highly regarded worldwide for their unparalleled sharpness and craftsmanship.

Tradition and Innovation: Shaping the Future of Sakai Knives

  • The blacksmithing tradition of Sakai began with iron tools in the Kofun period, evolved into sword-making, adapted to firearms, transitioned to tobacco knives, and ultimately led to the creation of world-class kitchen knives.

  • Through centuries of innovation and refinement, Sakai’s craftsmen have preserved their techniques while continuously improving them. A Sakai knife is not just a cooking tool—it is the culmination of over a thousand years of Japanese craftsmanship and dedication.

  • As these techniques continue to be passed down, Sakai knives will remain a symbol of excellence, shaping the future of culinary arts worldwide.

The Origin of Craftsmanship

  • The Essence of Knife Making: Crafting a Story Through Material and Shape

  • Knife making is not just a craft; it’s the creation of a “story” by engaging with materials and giving them shape. Each piece of steel is hammered, heated, and shaped, transforming from mere material into a tool that fits the hand of its user. The moment when the steel takes form in my hands, as if it’s being infused with life, is the most rewarding part of the process.

  • That’s why I don’t just create knives that are sharp; I craft the “perfect strike” for the user. The story that unfolds during this process is the true value for me.
Sakai Traditional Craftsmen Collection

KIREAJI's Three Promises to You

  • japanese_knife_made_in_Sakai

    1. Exceptional Japanese Knives

    Our knives, crafted by Sakai City's master artisans, combine traditional techniques with carefully selected materials, delivering unrivaled sharpness and durability.

  • 2. For a Lifetime of Use

    At KIREAJI, we see knives as lifelong companions. Each knife comes with a free saya, and we offer Honbazuke hand-sharpening by Shiroyama Knife Workshop in Sakai City.

  • 3. Supporting the Joy of Continued Use

    KIREAJI knives are made to grow with you. That’s why we provide trusted after-sales care (fee-based) .