Misen chef's knife with blue handle and stainless steel blade

6" Bunka Knife (ACUTO440) - Blue

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$99.00
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Misen chef's knife with blue handle and stainless steel blade
  • Misen chef's knife with blue handle and stainless steel blade
  • Misen chef's knife with blue handle on wooden cutting board with fresh parsley
  • Misen chef's knife slicing a fresh tomato on a wooden cutting board
  • Misen chef knife with blue G10 handle and stainless steel blade
  • Misen kitchen knife blade close-up with blue handle and stainless steel finish
  • 6" Bunka Knife (ACUTO440) - Blue
  • Misen chef's knife with blue handle and stainless steel blade
  • Misen chef's knife with blue handle on wooden cutting board with fresh parsley
  • Misen chef's knife slicing a fresh tomato on a wooden cutting board
  • Misen chef knife with blue G10 handle and stainless steel blade
  • Misen kitchen knife blade close-up with blue handle and stainless steel finish
  • 6" Bunka Knife (ACUTO440) - Blue
6" Bunka Knife (ACUTO440) - Blue

30 Reviews

6" Bunka Knife (ACUTO440) - Blue

6 Inch Bunka Knife

$99.00

A Japanese-style chef’s knife with a paring tip. Compact, versatile, and built for everyday prep with extra precision.

Color: Blue
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60-Day Test Drive
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Lifetime Warranty Against Defects
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Free Returns
Features
  • AICHI ACUTO440 Japanese steel for exceptional sharpness and edge retention
  • Lab-tested rust resistance proven to withstand 50 days submerged in water and up to 100 dishwasher cycles.
  • 6” straight-belly blade for compact, versatile prep and clean, controlled cuts
  • Triangle tip for precise tasks like mincing and trimming
  • Ergonomic rounded spine and bolster for a more comfortable pinch grip
Rust-proof feature icon with spark symbols

Rust-Proof
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ACUTO440 Steel
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Up & Down Chop
Use & Care
  • Hand wash
  • Dry immediately after use
  • Sharpen every 4–6 months
  • Heads up: High-carbon knives may show discoloration after exposure to acidic foods and/or salt. This is purely cosmetic and different from rust, which is extremely rare. 
  • Visit our Help Hub for more on how to use and care for this knife.

Let Us Handle the Sharpening
Specifications

Blade Length: 5.9 in. / 152 mm
Total Length: 11.52 in. / 293 mm
Handle Thickness: 18 mm
Weight: 0.43 lb / 194 g
Steel: AICHI ACUTO 440 (Japan)
HRC: 58±2
Grind & Edge: 50/50 Symmetrical, 14° per side
Handle Material: Polyoxymethylene
Country of Production: PRC
Warranty

All Misen products come with a lifetime warranty against defects. Misen will replace any defective products. Learn more about our warranty policy here and what's covered.

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Basically a Navy Seal

Rust-proof after 100 dishwasher cycles.

Because it’s got more chromium than standard high-carbon stainless, ACUTO440's rust resistance is a lab result, not a marketing claim.
Sliced salami and mozzarella sheet pan pizza on parchment paper being cut with a Misen chef's knife
Misen bread knife slicing dark sourdough loaf on wooden cutting board

Works Harder, Stays Sharper

Holds a razor edge through heavy prep.

At 58±2 HRC, ACUTO440 has incredible edge retention without brittleness. That means you can put off sharpening it for longer.

Questions?

What are Misen’s ACUTO440 Knives made of?

Our ACUTO440 Knives are made with AICHI ACUTO440, an exceptionally corrosion-resistant Japanese high-carbon stainless steel. AICHI ACUTO440 is rust-proof, incredibly durable, and has excellent edge retention. What that means for you: less time cleaning and sharpening, more cooking.
What’s the difference between Misen’s ACUTO440 Knives and classic knives?

All of our knives are made from high-carbon stainless steel, which is what gives them their razor-sharpness and excellent edge retention. However, our ACUTO440 Knives have a much higher chromium content (about 18%), which makes them significantly more corrosion (aka rust) resistant.

Our ACUTO440 Knives also feature a rounded spine and heel (the back of the knife where the blade meets the bolster), creating a more comfortable grip over long prep sessions.
How are Misen’s ACUTO440 Knives different from other high-carbon knives?

We wanted our ACUTO440 Knives to be high-performance tools that you could still leave in the sink overnight if you needed to. That’s why our ACUTO440 Knives are made with AICHI ACUTO440, a Japanese high-carbon stainless steel that is more durable and easier to care for than other high-carbon knives, which are prone to rusting and/or chipping without proper care.
What do you mean by rust-proof?

Our ACUTO440 Knives are made with AICHI ACUTO440 steel, an exceptionally corrosion-resistant Japanese high-carbon stainless steel. Our knives have been lab-certified to withstand up to 100 dishwasher cycles, as well as 50 days of being submerged in water, without showing any signs of rust.
Can I put Misen’s ACUTO440 Knives in the dishwasher?

While our ACUTO440 Knives have been lab-certified to withstand up to 100 dishwasher cycles without showing any signs of rust, we generally recommend hand washing all of your Misen knives. Because our knives are extremely sharp, when they get jostled around in the dishwasher, the blade can cut through the soft materials that make up your dishwasher racks. Dishwashing can also damage your knives if the blade edge bangs against hard objects like flatware or pots and pans during the washing cycle.
How often should I sharpen my knives?

Whenever you start to notice your knife is slicing and dicing a little less crisply than usual, it’s time to sharpen. Although our ACUTO440 Knives can go long periods between sharpenings, we generally recommend getting them sharpened about twice a year for best performance. We also recommend regularly using a honing rod between sharpenings to keep your knife edge in good shape.
My blade has discoloration and/or staining. What is this?

While our ACUTO440 Knives are rust-proof, all high-carbon knives can experience some discoloration and/or staining with prolonged exposure to acidic foods and/or salt. This is purely cosmetic and is not the same as rust.

Customer Reviews

5.0
Rated 5.0 out of 5 stars
Based on 30 reviews
Total 5 star reviews: 30 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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30 reviews
  • Mike
    Reviewing
    6" Bunka Knife (ACUTO440) - Blue
    I recommend this product
    Rated 5 out of 5 stars
    3 weeks ago
    Sharpest knife I’ve ever owned!

    I had a different Misen knife for years and it is my go to knife at home but needed a new knife for my camper. First thing I used it on was a watermelon and it just went through it like it was butter. It feels great in your hand and I know it will last for a very long time.

    Was this helpful?
  • pat O.
    Reviewing
    6" Bunka Knife (ACUTO440) - Blue
    I recommend this product
    Rated 5 out of 5 stars
    3 weeks ago
    Bunka

    Somewhat odd looking to my eye. but when added to my set, I noticed it was the first knife used by the rest of the family. Very easy to use, Misen sharp and efficient.

    Try the bunka !!

    Doubt you send it back. It will become one of your favorites

    Was this helpful?
  • AB
    Flag of United States
    Verified Buyer
    Reviewing
    6" Bunka Knife (ACUTO440) - Blue
    I recommend this product
    Product Standouts sharp, easy-to-use, good balance, sleek design, comfortable handle
    Rated 5 out of 5 stars
    2 months ago
    My new favorite knife.

    My go to knife has been the Misen 8 inch chef knife since it was released. This knife is my new favorite. Super sharp out of the box and seems to hold an edge longer than my other knives, including the 8 inch Chef. The blade shape is fantastic. My one complaint is, I want it in an 8 inch version...

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  • Richard K.
    Flag of United States
    Verified Buyer
    Reviewing
    6" Bunka Knife (ACUTO440) - Blue
    I recommend this product
    Rated 5 out of 5 stars
    3 months ago
    Bunka Knife

    Very nice knife, extremely sharp!

    Was this helpful?
  • Jonathan S.
    Flag of United States
    Verified Buyer
    Reviewing
    6" Bunka Knife (ACUTO440) - Blue
    I recommend this product
    Product Standouts sharp, easy-to-use, good balance, nice weight, comfortable handle
    Rated 5 out of 5 stars
    4 months ago
    Great knife!

    Real nice weight and balance--sharp, too. The 6-inch blade makes it easier to use than an 8-inch Chef's knife.

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Why the 6‑Inch Blue Bunka Knife Delivers Precise Everyday Prep

The 6" Bunka Knife brings the compact, flat-bellied profile of a Japanese-style chef's knife together with a paring tip, making it especially good at precise tasks like mincing garlic, trimming fat, or breaking down smaller vegetables where a longer blade feels unwieldy. Forged from AICHI ACUTO440 steel and hardened to 58±2 HRC, it holds a fine edge through repeated prep sessions, so you're not stopping mid-cook to touch it up.

What sets ACUTO440 apart from typical high-carbon knives is its higher chromium content, which gives it lab-tested rust resistance even after prolonged water exposure. That durability means less babying in daily use, though hand washing and drying it promptly will still keep it performing at its best. If you want more reach for larger produce or proteins, the 6.5" Gyuto Knife makes a natural companion in the same steel and finish.

For thin, precision cuts on bread or tomatoes, pair it with the 5" Serrated Knife, and if you're building out a full lineup at once, the 7-Piece Knife Set covers the rest of your prep needs in matching ACUTO440 steel.