Misen 8-inch chef knife with stainless steel blade and black handle

6" Bunka Knife (ACUTO440) - Black

Black
$99.00
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Misen 8-inch chef knife with stainless steel blade and black handle
  • Misen 8-inch chef knife with stainless steel blade and black handle
  • Misen chef's knife slicing a fresh tomato on a wooden cutting board
  • 6" Bunka Knife (ACUTO440) - Black
  • Misen chef knife with black handle and stainless steel blade
  • Misen chef's knife blade close-up showing polished stainless steel and bolster
  • Misen chef's knife with blue handle on wooden cutting board with fresh parsley
  • Misen 8-inch chef knife with stainless steel blade and black handle
  • Misen chef's knife slicing a fresh tomato on a wooden cutting board
  • 6" Bunka Knife (ACUTO440) - Black
  • Misen chef knife with black handle and stainless steel blade
  • Misen chef's knife blade close-up showing polished stainless steel and bolster
  • Misen chef's knife with blue handle on wooden cutting board with fresh parsley
6" Bunka Knife (ACUTO440) - Black

33 Reviews

6" Bunka Knife (ACUTO440) - Black

6-Inch Bunka Knife in Black

$99.00

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

Color: Black
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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.

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Why It’s Great

The Triangle Tip Does More Than Look Cool

The pointed tip is built for precision work like mincing, trimming, and drawing cuts.

Let’s Talk About That Belly

The straight-belly blade excels at those up-and-down cuts you’ll want for slicing and chopping vegetables.

The Spine and Bolster Make It Easy

Rounded and ergonomic, they reduce pinch-grip finger pressure so you’ll stay comfy over long prep sessions.

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 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

6-Inch Bunka Knife in Black

The 6" Bunka Knife (ACUTO440) in Black is a Japanese-style chef’s knife with a paring tip, sized for compact, everyday prep when you want extra precision without giving up versatility. If you’re deciding between colors, the knife’s core design and care guidance stay the same on this page, so your choice mainly comes down to the look you want on your board and in your drawer.

What makes this 6 inch bunka knife feel so precise is the combination of a 6" straight-belly blade (5.9 in. blade length) and the bunka’s triangle tip. The straighter belly helps with clean, controlled cuts during compact prep, and the pointed tip is designed for fine tasks like mincing and trimming where accuracy matters. Misen also calls out an ergonomic rounded spine and bolster to support a more comfortable pinch grip, which is especially helpful when you’re doing lots of quick, repetitive board work.

The blade uses AICHI ACUTO440 Japanese steel, chosen for exceptional sharpness and edge retention, plus rust resistance that has been lab-tested to withstand 50 days submerged in water and up to 100 dishwasher cycles. Even with that testing, the stated use and care is simple and practical: hand wash, then dry immediately after use. For keeping it performing like it should, plan to sharpen every 4 to 6 months, based on how often you cook and how hard you work the edge.

If you’re building out a kit piece by piece, it can help to browse Misen’s single knives to compare shapes and sizes for your usual prep, or scan the broader kitchen knives lineup for other everyday staples. For maintenance details specific to this steel, Misen’s Acuto knives care page is a helpful reference, including what to expect if you notice discoloration after exposure to acidic foods and or salt. The page notes this discoloration is cosmetic and different from rust, which is extremely rare.

Frequently Asked Questions About 6 Inch Bunka Knives

What is the bunka’s triangle tip used for?

This bunka knife has a triangle tip designed for precise tasks like mincing and trimming. If you often find yourself doing detail work at the end of a cut, or cleaning up ingredients with small, controlled movements, the pointed tip gives you more accuracy than a rounder tip profile.

Is this knife rust resistant?

Yes. The page specifies AICHI ACUTO440 steel with lab-tested rust resistance, proven to withstand 50 days submerged in water and up to 100 dishwasher cycles. It is also described as delivering rust-proof performance for prep.

How should I wash and dry the 6" Bunka Knife?

The stated care instructions are to hand wash and dry immediately after use. While the steel’s rust resistance was tested against dishwasher cycles, hand washing and prompt drying are still recommended to keep the knife in great condition over time.

Why might the blade discolor, and is that rust?

The page notes that high-carbon knives may show discoloration after exposure to acidic foods and or salt. That change is described as purely cosmetic and different from rust, which is said to be extremely rare for this knife.

How often should I sharpen it?

Misen’s guidance is to sharpen every 4 to 6 months. Your exact schedule can vary with how often you cook, what you cut, and how you store the edge between uses, but this window is the recommended baseline.