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

6" Bunka Knife (ACUTO440)

Blue
$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
  • 6" Bunka Knife (ACUTO440)
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6" Bunka Knife (ACUTO440)

33 Reviews

6" Bunka Knife (ACUTO440)

Bunka Knife Stainless Steel in ACUTO440

$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
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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.

Pair it with

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. To remove discoloration, make a paste with baking soda and water. Apply the paste to the discolored spots, then use a soft microfiber cloth to gently rub the paste into the affected area to remove discoloration. Wash your knife with a soft sponge and warm soapy water, then dry right away. That's it.

Customer Reviews

5.0
Rated 5.0 out of 5 stars
Based on 33 reviews
Reviews Summary
Customers say this knife is exceptionally sharp out of the box and offers excellent control for various kitchen tasks. The compact 6-inch blade size appeals to those finding standard chef's knives too large, while the distinctive triangular tip proves useful for detailed work like deveining and slicing. Users praise the lightweight yet well-balanced design, noting it feels comfortable in hand during extended use. Many reviews highlight the blade's edge retention and low maintenance needs. The versatile shape handles everything from vegetable chopping to meat preparation. Several customers mention it has become their primary go-to knife, replacing larger alternatives in their regular rotation.
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33 reviews
  • Julieta G.
    Verified Buyer
    Reviewing
    6" Bunka Knife (ACUTO440) - Black
    I recommend this product
    Rated 5 out of 5 stars
    4 minutes ago
    Favorite knife

    This knife is perfect for all your meal prep veggies!!!

    It’s just a all around versatile knife.

    Was this helpful?
  • Jim J.
    Verified Buyer
    Reviewing
    6" Bunka Knife (ACUTO440) - Blue
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Love the Misen knives

    I have purchased a complete set in black many years ago. Then I decided to buy more with the blue handles. The 6 inch Bunka knife is a favorite and go to for chopping. Overall I love Misen knives, pots and pans, waiting for the new microwavable storage containers, on order, and also other accessories from Misen. The quality and workmanship is above and beyond the other upscale knives. I will continue to purchase Misen products!

    Was this helpful?
  • Linda S.
    Verified Buyer
    Reviewing
    6" Bunka Knife (ACUTO440) - Blue
    I recommend this product
    Rated 5 out of 5 stars
    3 weeks ago
    A revelation

    I've been using serrated all-purpose knives for most cooking. This gives more control and speed.

    Was this helpful?
  • Mike
    Reviewing
    6" Bunka Knife (ACUTO440) - Blue
    I recommend this product
    Rated 5 out of 5 stars
    2 months 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
    2 months 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?
Show More

Why a Bunka Knife Is Made for Compact, Precise Prep

The Misen 6" Bunka Knife (ACUTO440) is a Japanese-style chef’s knife built for compact, precise everyday prep. Its straight-belly blade is sized for control on smaller boards, while the paring-style triangle tip helps with detail work that can feel clumsy on larger knives. If you want one versatile knife that still feels nimble, this bunka is designed to sit right in that sweet spot.

What makes a bunka different is the combination of a chef’s-knife profile and a sharper, more pointed tip. On this knife, that triangle tip is purpose-built for precise tasks like mincing and trimming, so you can work close to the cutting board and make controlled, intentional cuts. The 6-inch format (5.9-inch blade length) also makes it easier to maneuver for quick prep sessions, smaller ingredients, or tighter counter space.

The blade uses AICHI ACUTO440 Japanese steel for exceptional sharpness and edge retention, plus lab-tested rust resistance that withstood extended water exposure and repeated dishwasher cycles. That said, Misen still recommends hand washing and drying immediately after use for best long-term performance. Like other high-carbon knives, it can show cosmetic discoloration after acidic foods or salt, which is different from rust.

Comfort matters with a knife you reach for daily, and the rounded spine and bolster are designed to make a pinch grip more comfortable. If you are building out your kit, you can browse other single knives or compare shapes across the full kitchen knives lineup to find the right balance of size and specialization.

For maintenance, plan to sharpen every 4 to 6 months as part of regular use and care. Misen also offers deeper guidance on cleaning and upkeep for this steel in their Acuto knives care resource, which is helpful if you are new to high-carbon blades or want to keep your edge performing consistently.

Explore Serrated Knives for more verified options related to this product.

Frequently Asked Questions About Bunka Knives

What is the bunka knife best used for?

This bunka is designed for compact, versatile everyday prep with extra precision. The straight-belly blade supports clean, controlled cuts, and the triangle tip is suited to precise tasks like mincing and trimming.

What steel is used in the 6" Bunka Knife?

The blade is made with AICHI ACUTO440 Japanese steel, chosen for exceptional sharpness and edge retention. The page also notes lab-tested rust resistance for this steel.

Is this knife dishwasher safe?

The steel is lab-tested to withstand up to 100 dishwasher cycles, but Misen’s use and care guidance still recommends hand washing and drying immediately after use to keep the knife in its best condition.

How often should I sharpen it?

Misen recommends sharpening this knife every 4 to 6 months. Keeping a consistent schedule helps maintain the razor-sharp performance the ACUTO440 blade is designed for.

What if the blade shows discoloration?

The page notes that high-carbon knives may show discoloration after exposure to acidic foods and or salt. This is described as purely cosmetic and different from rust, which is noted as extremely rare.