Misen bread knife with serrated blade and blue handle

Serrated Knife (ACUTO440)

5" / Blue
$99.00
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Misen bread knife with serrated blade and blue handle
  • Misen bread knife with serrated blade and blue handle
  • Misen bread knife with serrated blade and blue handle
  • Misen steak knife with serrated blade and blue handle close-up
  • Misen serrated bread knife slicing dark sourdough loaf on wooden cutting board
  • Hands cutting delicata squash on wooden cutting board with acorn squash nearby
  • Misen serrated bread knife with black handle and stainless steel blade
  • Misen bread knife with red handle and serrated stainless steel blade
  • Misen serrated bread knife with white handle and stainless steel blade
  • Misen bread knife with serrated blade and blue handle
  • Misen serrated bread knife with black handle and stainless steel blade
  • Misen bread knife with red handle and serrated stainless steel blade
  • Misen serrated bread knife with white handle and stainless steel blade
  • Misen bread knife with serrated blade and blue handle
  • Misen bread knife with serrated blade and blue handle
  • Misen steak knife with serrated blade and blue handle close-up
  • Misen serrated bread knife slicing dark sourdough loaf on wooden cutting board
  • Hands cutting delicata squash on wooden cutting board with acorn squash nearby
  • Misen serrated bread knife with black handle and stainless steel blade
  • Misen bread knife with red handle and serrated stainless steel blade
  • Misen serrated bread knife with white handle and stainless steel blade
  • Misen bread knife with serrated blade and blue handle
  • Misen serrated bread knife with black handle and stainless steel blade
  • Misen bread knife with red handle and serrated stainless steel blade
  • Misen serrated bread knife with white handle and stainless steel blade
Serrated Knife (ACUTO440)

83 Reviews

Serrated Knife (ACUTO440)

ACUTO440 Serrated Knife, 5" or 8"

$99.00

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: 5"
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 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.

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 83 reviews
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83 reviews
  • Robert P.
    Verified Buyer
    Reviewing
    5" Serrated Knife (ACUTO440) - Blue
    I recommend this product
    Rated 5 out of 5 stars
    1 week 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
    3 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?
  • Sara F.
    Flag of United States
    Verified Buyer
    Reviewing
    8" Serrated Knife (ACUTO440) - Blue
    I recommend this product
    Product Standouts sharp, easy-to-use, good balance, premium materials, nice weight
    Rated 5 out of 5 stars
    3 months ago
    Favorite Bread Knife!

    This particular version of Misen Bread knife was given as a gift. I have loved my knife for YEARS due to the weight, efficiency, ease and perfect serration.

    Was this helpful?
Show More

Choose 5" or 8" for Clean Bread and Tomato Slices

If you want clean slices through foods that tend to squish, tear, or crumble, Misen’s Serrated Knife (ACUTO440) is designed for that job. The wave-shaped serrations help the blade glide through crusty and soft surfaces (think bread and ripe tomatoes) without ripping the interior, and the rust-proof ACUTO440 steel is built for long-term use in a busy kitchen.

Compare Serrated Knife (ACUTO440) Options

OptionBest forKey differencePrice
Serrated Knife (ACUTO440)
Current product		Choosing your ideal size and color in one listingSize options (5 inch or 8 inch) plus multiple colorsFrom $99.00
5" Serrated Knife (ACUTO440) - BlueCompact serrated prep and tight cutting spacesSingle configuration, 5 inch in Blue$99.00
8" Serrated Knife (ACUTO440) - BlueLonger slices across loaves and larger soft foodsSingle configuration, 8 inch in Blue$109.00
10" Serrated Knife - BlueBreads, cakes, and big fruitsLongest serrated knife option listed, designed for clean slices without crushing or tearing$104.00
Serrated Knife (AUS-8)Shoppers who specifically want the AUS-8 versionUses AUS-8 steel, described with a POM handle on the verified storefront excerpt$104.00
Serrated Steak KnivesTable knives for steak, chicken, and chopsSet format (not a single prep knife), designed to slice cleanly with no sawing or shredding$97.00
4-Piece Serrated Steak Knives - RedSmaller households that want matching steak knivesFour-piece serrated steak knife set in Red$97.00
8-Piece Serrated Steak Knives - RedEntertaining and bigger place settingsEight-piece serrated steak knife set in Red$194.00
Serrated Chef SpoonQuick slicing and scooping while you cookA multitasking spoon with a serrated edge (not a dedicated knife)$19.00

Choosing between 5 inch and 8 inch comes down to control versus stroke length. A shorter blade is easier to maneuver for small items and quick tomato slices, while the longer blade helps you finish a cut across bread and larger foods in fewer passes, which can reduce tearing and compression. If you routinely slice full loaves, cakes, or big fruits, the longer serrated options in the lineup may be a better match.

All ACUTO440 versions focus on smooth, confident cutting through tricky textures. The blade uses wave-style serrations, plus an ergonomic rounded spine meant to feel comfortable in a pinch grip, which matters when you are guiding the knife through a crust. For more shapes and lengths in this style, browse the serrated knives lineup, or zoom out to compare with other essentials in kitchen knives.

Care is straightforward: hand wash and dry immediately after use. While the knife’s rust resistance is lab-tested (including submersion and dishwasher-cycle testing), the recommended routine keeps the edge and finish looking their best over time. Misen also notes that high-carbon knives can show cosmetic discoloration after exposure to acidic foods and or salt, which is different from rust and does not affect performance.

For maintaining your edge, Misen recommends sharpening every 4 to 6 months, and there is also a mail-in knife sharpening service available for any knife. If you want guidance specific to this steel, the ACUTO knives care page walks through best practices so your serrations keep slicing cleanly.

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

Frequently Asked Questions About ACUTO440 Serrated Knives

Should I choose the 5 inch or 8 inch serrated knife?

Pick 5 inch for compact control on smaller foods and quick slicing, and 8 inch when you want more blade length for breads and larger items. Both use ACUTO440 steel and wave-style serrations, so the main difference is how much cutting stroke you prefer.

What foods are wave-shaped serrations best for?

Wave-shaped serrations are meant to glide through crusty outsides and soft, squishy interiors without tearing. That makes them especially useful for bread and ripe tomatoes, plus other foods where a straight edge can skid, crush, or rip before cutting cleanly.

Is this knife dishwasher safe?

The blade’s rust resistance is lab-tested to withstand up to 100 dishwasher cycles, but Misen still recommends hand washing and drying immediately after use. That routine is the simplest way to protect the knife’s finish and keep it performing well.

How often should I sharpen this serrated knife?

Misen recommends sharpening every 4 to 6 months. How often you actually need to sharpen depends on use, but that schedule is a good baseline for keeping the knife slicing cleanly through crusty and soft foods.

Why did the blade discolor after cutting acidic foods?

Misen notes that high-carbon knives may show discoloration after exposure to acidic foods and or salt. The discoloration is cosmetic and different from rust, which Misen describes as extremely rare with this rust-proof, lab-tested steel.