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Kurosaki  |  SKU: KS-SACO-GY240

Kurosaki Sasame COSP Gyuto 240mm

Regular price $13,628.00

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Availability

  • St Peters, NSW
    2 Bishop St, Unit 2, St Peters NSW 2044
  • Crows Nest, NSW
    107 West St, Shop 1, Crows Nest NSW 2065
    Pickup only
  • Prahran, VIC
    180 Commercial Road, Shop 1, Prahran VIC 3181
    Pickup only
Detailed Specifications
Line Kurosaki Sasame COSP Tsuchime
Profile Gyuto / Chefs Knife
Bevel Type Double Bevel
Weight 224 g | 7.9 oz
Edge Length 244 mm | 9 39/64″
Heel Height 51 mm | 2 1/64″
Width @ Heel 3.6 mm | 9/64″
Width @ Mid 2.1 mm | 5/64″
Width @ 1cm from Tip 1.0 mm | 3/64″
Steel COSP (Cobalt Special) | Stainless
Blade Construction Sanmai - Stainless Clad
Hardness (HRC) 60 - 62
Surface Finish Tsuchime
Handle Octagonal Ebony
Region Takefu
Best for
  • Pro chefs
  • Enthusiasts
  • Free shipping for knives over AU$200 Australia wide.
  • World-wide shipping via DHL Express, 3 to 5 days.


Sasame(笹目, Bamboo Pattern) a line crafted by Yu Kurosaki that is built a little bit different. With the Gekko, Senko and Kokusen using stamping method to produce the blank, the knives from the Sasame are all forged, which can be identified by its thick Machi(neck) and distal taper in the spine. This adds rigidity to the blade and made it feel very confident and precise to use, and the stainless nature will make this a line highly suitable for professionals in busy kitchen.

The combination of forging and stainless steel may seems simple, but it is something worth noting. When steel is heated up for forging, the stainless steel will be harder and deform less compare to carbon steel, there is also a smaller temperature zone you can forge them at. For these reasons, you would rarely see forged stainless steel knives.

When forging, many blacksmiths would like to thin down the blade but kept the neck and tang thick, which increases the rigidity of the blade agains t bending and torsion and gives some weight to the knife. As the result, the knife will feel very responsive and follow your desired cutting trajectory especially when cutting hard objects, and thin, high performance blade(that Kurosaki san and other Echizen smiths are known for) won't feel gossamery.

The Sasame itself inherent some of the features that we love about Kurosaki san's knives: great finish, thin and aggressive bevel geometry and a bamboo leaf pattern that proudly display its identity. The nuance is, the bevel of Sasame is not a concave grind, but a convex instead, which does improve the food release and smoothness of the cut. Pairing with the highly polished bevel surface, Sasame is the best gliding knife I've every tested from Kurosaki.

Using the Cobalt Special as the core steel, the Sasame wouldn't be as pricy as the R2/SG2 Shizuku/Fujin that are also forged, it is a successor to the previous COSP line Raijin, and is a great option for professionals and knife enthusiasts.

Pros Cons
  • Great for professionals
  • Excellent performance
  • Thin behind the edge
  • High budget
  • A little bit brittle
Care Instruction
  1. Don't cut hard things! Japanese knives are brittle so bone hacking is a NO NO!
  2. Wash with neutral detergent after use, and wipe dry;
  3. Please don't wash knife with dishwasher, it will damage the wood handle;
  4. Be careful not to leave the knife close to a heat source for a long time;
  5. It is a lot more dangerous to cut with a blunt knife than a sharp knife!
  6. It is best to sharpen a Japanese knife regularly on a waterstone.

Yu Kurosaki

Yu Kurosaki -- the leading knife maker from Takefu.

Yu Kurosaki, a master artisan in his forties, is renowned in Japanese knife making for his hand-forged blades, earning him awards and global recognition. His journey began in his teenage years, and after a twelve-year apprenticeship under Hiroshi Kato, he established his own workshop in 2014. Kurosaki excels not only in craftsmanship but also in innovative finishing techniques, notably seen in his Tsuchime and Suminagashi finishes. Recognized by the Japanese government as a “master blacksmith,” he is the youngest to receive this title. Highly esteemed for his unconventional blade designs, Kurosaki consistently surprises observers with each new creation. By blending modern metallurgical technologies with traditional forging methods, his knives boast unmatched quality, sharpness, and performance, cementing his status as a leading figure in the industry.

Read more

Yu Kurosaki, a master artisan in his forties, stands at the forefront of Japanese knife making, celebrated for his hand-forged blades that have garnered prestigious awards and global recognition. His journey began in his teenage years, and after a twelve-year apprenticeship under Hiroshi Kato, he established his own workshop in 2014. Kurosaki excels not only in craftsmanship but also in innovative finishing techniques, notably seen in his Tsuchime and Suminagashi finishes. Recognized by the Japanese government as a “master blacksmith,” he is the youngest to receive this title. Highly esteemed for his unconventional blade designs, Kurosaki consistently surprises observers with each new creation. By blending modern metallurgical technologies with traditional forging methods, his knives boast unmatched quality, sharpness, and performance, cementing his status as a leading figure in the industry.

Drawing from over 700 years of Echizen artisans' tradition, Kurosaki infuses his knives with unforgettable impressions and unparalleled cutting pleasures. His creations, meticulously crafted in small batches, have gained widespread popularity overseas, often becoming coveted collectibles. Presently situated at the esteemed Takefu Knife Village in Echizen, Fukui Prefecture, alongside other talented artisans, Yu Kurosaki continues to push the boundaries of knife making, surprising and delighting enthusiasts with each new creation.

“the leading figure of the young Japanese blacksmith, sharp knives with artistic design. ”

Est. 2014 | 平成26年
Known for Extreme performance, unique hammered pattern.
Website kurosakiknives.jp Instagram @kurosakiknives Read more about Yu Kurosaki
Yu Kurosaki — Takefu

Knife details

Profile: Gyuto
Profile

Gyuto

Chefs Knife

A Japanese chef's knife is known as a gyuto (牛刀 ぎゅうとう) gyūtō), literally meaning 'beef knife'. Its blade resembles a flatter version of a French chef's knife. Japanese cutlery is known for sharpness due to its acute blade geometry, and the hardness of the steel used, sometimes exceeding 60 HRC on the Rockwell Scale A typical western chef's knife may be sharpened to an edge angle of 20-22°, while a Japanese gyuto generally has a sharper edge angle of 15-18° (or even lower), which requires a harder, more brittle grade of steel. In recent years Japanese gyuto have gained in popularity with western chefs.

A modern chef's knife is a multi-purpose knife designed to perform well at many differing kitchen tasks, rather than excelling at any one in particular. It can be used for mincing, slicing, and chopping vegetables, slicing meat, and disjointing large cuts.
Composition

COSP (Cobalt Special) Element Composition

Compare with
    COSP (Cobalt Special)
    16.0% 12.0% 8.0% 4.0% 0
    C
    1.05%
    Cr
    16.0%
    V
    0.25%
    Mo
    1.5%
    W
    0.25%
    Co
    2.5%
    C — Carbon Cr — Chromium V — Vanadium Mo — Molybdenum W — Tungsten Co — Cobalt
    Hardness 60–62 HRC
    555759616365+
    Steel
    COSP (Cobalt Special)
    Category
    Stainless
    Manufacturer
    Takefu Special Steel, Japan 🇯🇵
    Hardness
    60–62 HRC
    Steel

    COSP (Cobalt Special)

    • Manufacturer
      • Takefu Special Steel, Japan
    • Nature Stainless
    • Hardness60–62 HRC
    Takefu Special Steel's Cobalt Special steel, often referred to as Cobalt Steel, is a premium high-performance steel known for its exceptional edge retention and hardness. This steel incorporates a significant amount of cobalt in its composition, enhancing its wear resistance and strength. The addition of cobalt, along with other elements like carbon, chromium, and molybdenum, allows the steel to achieve a high level of hardness without compromising its toughness. Cobalt Special steel is designed to maintain a sharp edge for extended periods, even under rigorous use, making it highly valued for crafting high-end kitchen knives and cutting tools.
    Makers such as Mojin and Kurosaki have some excellent COSP offerings.
    Construction: Sanmai - Stainless Clad
    Construction

    Sanmai - Stainless Clad

    Sanmai(Three-Piece) is a common construction for double bevel knives where two pieces of softer cladding steel are forgewelded to each side of a harder core steel. The harder but more brittle core steel will form the hard cutting edge after heat treating, and the softer cladding will support the core to increase the overall strength of the blade.

    The soft cladding enables the thinning process to be a lot easier than a honyaki or monosteel construction. And in the case where the cladding steel are stainless in nature, it can offer protection for the carbon or semi-stainless cores against rusting and discoluoring.

    Finish: Tsuchime
    Finish

    Tsuchime

    The "Tsuchime" finish in Japanese kitchen knives refers to a distinctive hammered texture on the blade's surface. This traditional technique not only adds a unique aesthetic appeal but also provides practical benefits, such as reducing drag and preventing food from sticking to the blade during slicing. It's a hallmark of craftsmanship that blends functionality with artistry, making each knife not only a tool but a piece of art.

    Handle
    Handle

    Octagonal Ebony

    • Profile Octagonal WA
    • Material
      • Ebony

    This handle, crafted from a single piece of ebony, exemplifies minimalist elegance and functional design. Its unique octagonal shape, featuring a subtle taper, offers a comfortable grip and a visually appealing geometric profile. The ebony wood, known for its deep, rich color and durability, has been meticulously milled from a single block, ensuring a seamless construction that highlights the wood's natural beauty and grain. The handle's surface has been highly polished, achieving a glossy finish that not only enhances the ebony's luxurious dark hue but also provides a smooth, tactile experience for the user. This design choice reflects a minimalist approach, focusing on simplicity, quality, and usability. The combination of the octagonal shape with the taper adds a modern twist to the classic material, making it a standout piece that blends traditional craftsmanship with contemporary aesthetics.

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    Frequently asked questions

    Gyuto or santoku - which should I choose?

    Both are all-purpose Japanese knives, and for most home cooks either will handle the bulk of daily prep. The choice comes down to length, blade shape, and how you like to cut.

    A gyuto is the Japanese chef's knife - typically 210 to 240mm with a gently curved edge that lets you rock and slide through cuts as well as chop. The extra length and pointed tip give you reach and versatility, from proteins to large produce.

    A santoku is shorter, usually 165 to 180mm, with a flatter profile and a rounded sheep's-foot tip. It rewards a straight up-and-down push cut, feels nimble in smaller hands or tight kitchens, and is the classic Japanese household knife.

    Rule of thumb: choose a gyuto if you want one do-everything knife with more reach, or a santoku if you prefer a compact, easy-to-control blade. Plenty of our customers end up owning both.

    What is a Gyuto, and what is it used for?

    A gyuto is the Japanese chef's knife — a double-bevel general-purpose kitchen knife. The name literally means "beef sword," and it's still a fair job description: you use it to slice meat, chop vegetables, dice aromatics, and break down fish. If you own one good knife, this is the shape it should be.

    Versus a typical Western chef's knife, a gyuto is thinner behind the edge, sharpened to a keener angle (roughly 15–18° rather than 20–22°), and usually made from harder steel — often above 60 HRC. That's what makes it slice so cleanly: less crushing, less tearing. The trade-off is a more brittle edge, so it asks to be honed and sharpened more attentively than a soft Western blade.

    Blades run from compact 150mm to long 240mm, but for a home kitchen I'd start at 210mm — my sizing FAQ explains why.

    What size gyuto should I buy?

    In a home kitchen I'd pick a 210mm gyuto. It's the sweet spot: long enough for a full slicing stroke, short enough to stay nimble on a normal cutting board and easy to control while you're still building your technique.

    Step up to a 240mm only if you regularly break down large cuts — roasts, whole fish, big vegetable prep. The extra length means longer strokes and fewer passes, but it also means more weight and a bigger board; if the tip is hanging off your bench you're fighting the knife, not cooking with it. If you're mainly doing vegetables and portions, the 240 gives you nothing you'll use.

    For a first gyuto, buy a well-made stainless one around 210mm in the low hundreds. Traditional carbon steels (white and blue paper steel) cut and sharpen beautifully, but they rust if you leave them wet — learn one variable at a time. Better steel is step two.

    240mm vs 210mm gyuto — which size should I choose?

    My call: get the 210mm. I only steer people to a 240mm when they regularly break down roasts, poultry, or whole fish — that's the one job where the extra 30mm genuinely changes how you work.

    The trade-off is stroke length versus handling. A 240 slices through a big piece of meat in one or two long draws; a 210 does the same job with more passes but much lighter handling, and fine work — herbs, small dice — stays quick instead of feeling like more knife than you need. The 240 also wants a bigger board, or its tip hangs off the edge and you compensate without noticing.

    Longer is not more professional, it's just for bigger food. If you cook like most home cooks, the 210 is the knife you'll reach for every day, and choosing it is a decision, not a compromise.

    Japanese vs German kitchen knives — which should I buy?

    If you want the sharpest possible edge and don't mind caring for a harder, more brittle blade, buy Japanese; if you want a tougher, more forgiving knife that can take abuse and be honed casually, buy German. Japanese knives, like the gyuto, are ground to a much sharper edge angle, typically 15 to 18 degrees compared to 20 to 22 degrees on a western chef's knife, and use harder steel that can exceed 60 HRC, which is why they cut with such precision but also chip more easily. German knives are softer and more ductile, so they resist chipping and bend rather than break, but they won't hold that razor-sharp edge as long.

    A Japanese knife is not the right choice if you regularly cut through bones, frozen food, or hard squash, or if you're used to rocking the blade hard on a cutting board, that lateral stress and impact can chip the edge. German knives are the better everyday beater for heavy prep, but you'll trade away the effortless slicing and fine edge retention that make Japanese steel so satisfying.

    The gyuto, literally "beef knife," is the Japanese take on a French chef's knife, with a flatter profile that suits push-cutting and slicing. That acute blade geometry is only possible because of the harder steel used, a typical western knife at 20 to 22 degrees would roll or dull quickly at 15 to 18 degrees, whereas the harder Japanese steel holds that finer edge. That's the core trade-off: hardness buys sharpness and edge retention, but it also makes the blade more brittle, so you need a gentler technique and a wooden or plastic board. For more on how these knives are built and what to look for, see the [Knives and Stones knowledge base](https://knivesandstones.com/pages/knowledge-base).

    Is Yu Kurosaki a good Japanese knife maker?

    Yes, Yu Kurosaki is widely regarded as one of the leading Japanese knife makers of his generation, known for combining exceptional cutting performance with artistic, hand-forged designs. Based in Takefu, he established his own workshop in 2014 after a twelve-year apprenticeship under Hiroshi Kato, and he has since earned recognition from the Japanese government as a “master blacksmith”, notably the youngest to receive that title. His knives are built around thin geometry and advanced steels like SG2 and Blue Super, which contribute to strong edge retention and precise cutting. He is also celebrated for innovative finishes such as Tsuchime and Suminagashi, which set his work apart visually while maintaining traditional craftsmanship.

    That said, "good" depends on what you're after. Kurosaki's blades are designed for extreme performance and artistic flair, not for heavy-duty or rough everyday use. The thin geometry that makes them cut so well also means they require careful handling and a proper cutting board, they are not the right choice if you're looking for a workhorse knife to abuse in a busy commercial kitchen. If you prioritise durability and forgiving edge stability over razor-sharp precision and visual uniqueness, a more robust, thicker-ground knife would serve you better.

    Kurosaki's reputation is built on a clear philosophy: aiming for the ultimate knife. His journey from teenage apprentice to master blacksmith reflects a deep commitment to both function and form. The K&S catalog highlights his signature use of SG2 and Blue Super steels, paired with distinctive hammered and layered finishes, which together deliver a balance of strength, edge retention, and aesthetic originality. For a closer look at his work and approach, you can explore the Yu Kurosaki maker page on the Knives and Stones site.

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