Misen serrated bread knife with black handle and stainless steel blade

8" Serrated Knife (ACUTO440) - Black

8" / Black
$109.00
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Misen serrated bread knife with black handle and stainless steel blade
  • Misen serrated bread knife with black handle and stainless steel blade
  • 8" Serrated Knife (ACUTO440) - Black
  • Misen serrated bread knife slicing dark sourdough loaf on wooden cutting board
  • Misen serrated bread knife with black handle and stainless steel blade
  • Misen steak knife serrated blade close-up with black handle
  • Hands cutting delicata squash on wooden cutting board with acorn squash nearby
  • Misen serrated bread knife with black handle and stainless steel blade
  • 8" Serrated Knife (ACUTO440) - Black
  • Misen serrated bread knife slicing dark sourdough loaf on wooden cutting board
  • Misen serrated bread knife with black handle and stainless steel blade
  • Misen steak knife serrated blade close-up with black handle
  • Hands cutting delicata squash on wooden cutting board with acorn squash nearby
8" Serrated Knife (ACUTO440) - Black

84 Reviews

8" Serrated Knife (ACUTO440) - Black

8" ACUTO440 Serrated Knife - Black

$109.00

Our rust-proof serrated knife, made with next-generation ACUTO440 steel. Wave-shaped serrations glide through crusty, soft, and/or squishy foods without tearing.

Size: 8"
Color: Black
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60-Day Test Drive

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Lifetime Warranty Against Defects

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Features
  • AICHI ACUTO440 steel for pro-level sharpness and edge retention
  • Lab-tested rust resistance proven to withstand 50 days submerged in water and up to 100 dishwasher cycles.
  • Wave-style serrations for smooth slicing with less tearing
  • Ergonomic rounded spine for a comfortable pinch grip
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Rust-Proof

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ACUTO440 Steel

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Serrated Blade
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: 8.1 in. / 208 mm
Total Length: 13.3 in. / 340 mm
Handle Thickness: 18 mm
Blade Height: 35 mm
Weight: 0.4 lb / 215 g
Steel: AICHI ACUTO 440 (Japan)
HRC: 58±2
Grind & Edge: Single blade, 25 wide-set serrations
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

Serrations That Stay Sharp

Most serrated knives dull within a year. ACUTO440 steel holds its edge longer, so you can skip the sawing and slice cleanly every time.

Your More-Than-Bread Knife

Glides through crusty sourdough but also slices a ripe tomato and a wedge of pie. The serrated edge handles anything with a surface that resists a straight blade.

Pick Your Size

The 5" is nimble for sandwiches, bagels, and small fruit. The 8" handles full loaves and layer cakes. Same steel, same edge, scaled to what you cook.

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

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Based on 84 reviews
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84 reviews
  • Audra A. B.
    Verified Buyer
    Reviewing
    8" Serrated Knife (ACUTO440) - Black
    I recommend this product
    Rated 5 out of 5 stars
    4 minutes ago
    Percusion

    This is a precision knife and a delight to own. Smooth clean cuts. I love it.

    Was this helpful?
  • Robert P.
    Verified Buyer
    Reviewing
    5" Serrated Knife (ACUTO440) - Blue
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    5” aerated knife has become our most used knife

    It’s just the right size. Not too big and not too small.

    Was this helpful?
  • Susan W.
    Flag of United States
    Verified Buyer
    Reviewing
    8" Serrated Knife (ACUTO440) - Blue
    I recommend this product
    Product Standouts sharp, good balance, comfortable handle
    Rated 5 out of 5 stars
    3 months ago
    Most used knife

    This knife is almost out on our counter because we use it every day to slice breads and bagels. It is angled perfectly to obtain thin or thick slices. It has maintained its sharpness, and I have purchased several as gifts.

    Was this helpful?
  • Michael B.
    Verified Buyer
    Reviewing
    Personalized 5" Serrated Knife (AUS-8) - Final Sale
    I recommend this product
    Rated 5 out of 5 stars
    3 months ago
    Wow that's sharp

    I love Misen. I have a couple pans and now purchased a third knife. Did I need it? No. Was the price right and did I trust the quality? Yes! The personalization option, for free, sealed it for me.

    When I tried it the first time it just confirmed it was a great decision. Super sharp, the right size and I absolutely love it.

    Was this helpful?
  • Eric W.
    Flag of United States
    Verified Buyer
    Reviewing
    8" Serrated Knife (ACUTO440) - Blue
    I recommend this product
    Rated 5 out of 5 stars
    4 months ago
    Sharp and cuts great

    We have tried it on sourdough bread and typical knives made it difficult. This knife was amazing

    Was this helpful?
Show More

8" ACUTO440 Serrated Knife - Black

The Misen 8" Serrated Knife (ACUTO440) in Black is built for clean slices through foods that usually get crushed or torn, from crusty loaves to soft tomatoes. Its wave-shaped serrations are designed to glide with less tearing, and the blade uses next-generation ACUTO440 steel with lab-tested rust resistance for everyday kitchen use.

If you are comparing sizes, the 8" length is a practical choice when you want longer, smoother draw cuts on wide bread, large sandwiches, and bigger produce. Misen also offers a 5" serrated option, which can feel more compact for smaller tasks, but this page’s 8" version is geared toward full-size slicing where blade length helps you finish the cut in fewer strokes.

ACUTO440 steel is the headline here, and Misen backs it up with lab testing: rust resistance proven to withstand 50 days submerged in water and up to 100 dishwasher cycles. For shoppers who want a serrated knife that holds up to real kitchen conditions, that test data is a useful signal, even though Misen still recommends hand washing and drying immediately after use for best results.

Comfort matters on a serrated knife because you often use a steady, sawing motion. This knife includes an ergonomic rounded spine designed for a comfortable pinch grip, which can make longer prep sessions feel more controlled. If you want to browse more shapes and sizes before deciding, see the full serrated knives lineup, or compare across other kitchen knives to build out your everyday set.

For care, Misen recommends hand washing, drying right away, and sharpening every 4 to 6 months. Also note the heads up for high-carbon knives: discoloration can appear after exposure to acidic foods or salt, and it is cosmetic and different from rust (which Misen notes is extremely rare). For detailed guidance, reference Acuto knives care.

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

Frequently Asked Questions About Serrated Knife

What foods is this 8" serrated knife designed to cut cleanly?

Misen describes the wave-shaped serrations as gliding through crusty, soft, and squishy foods without tearing. Common examples called out include bread, tomatoes, and crusty loaves, where a straight edge can crush delicate interiors or snag on tough skins.

Is the blade rust-proof, and what testing supports that?

Yes. The product notes lab-tested rust resistance, proven to withstand 50 days submerged in water and up to 100 dishwasher cycles. The knife is also described as rust-proof and made with next-generation ACUTO440 steel.

If it can handle dishwasher cycles, why does Misen still recommend hand washing?

The use and care instructions on the page recommend hand wash and dry immediately after use. Even with lab-tested rust resistance, hand washing helps reduce wear from detergents, heat, and contact with other items, keeping the knife in better condition over time.

How often should I sharpen this serrated knife?

Misen recommends sharpening every 4 to 6 months. Keeping to that schedule helps maintain the knife’s cutting performance, especially if it is a frequently used bread and tomato knife in your kitchen.

What is the discoloration note, and is it the same as rust?

The page notes that high-carbon knives may show discoloration after exposure to acidic foods and or salt. It specifies this is purely cosmetic and different from rust. Misen also states rust is extremely rare for this knife.