Misen bread knife with serrated blade and blue handle

5" Serrated Knife (ACUTO440) - Blue

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
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  • 5" Serrated Knife (ACUTO440) - Blue
  • Misen serrated utility knife with blue handle, stainless steel blade
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  • Smoked salmon bagels with cream cheese, red onion, capers, and dill on a wooden cutting board with a Misen serrated knife
  • Misen bread knife with serrated blade and blue handle
  • Hands segmenting a peeled orange over a glass bowl on a wooden cutting board
  • 5" Serrated Knife (ACUTO440) - Blue
  • Misen serrated utility knife with blue handle, stainless steel blade
  • Misen steak knife with serrated blade and blue handle close-up
  • Smoked salmon bagels with cream cheese, red onion, capers, and dill on a wooden cutting board with a Misen serrated knife
5" Serrated Knife (ACUTO440) - Blue

84 Reviews

5" Serrated Knife (ACUTO440) - Blue

Serrated Utility Knife 5 Inch in Blue

$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: 5 in. / 127 mm
Total Length: 10 in. / 253 mm
Handle Thickness: 28 mm
Blade Height: 17 mm
Weight: 4.8 oz / 136 g
Steel: AICHI ACUTO 440 (Japan)
HRC: 58±2
Grind & Edge: Single blade, 18 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.

Customer Reviews

5.0
Rated 5.0 out of 5 stars
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
    3 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.

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  • 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

Serrated Utility Knife 5 Inch in Blue

The Misen 5" Serrated Knife (ACUTO440) in Blue is built for the moments when a straight-edge blade tends to skid or crush. Its wave-shaped serrations are designed to glide through crusty, soft, and even squishy foods without tearing, so you can get cleaner slices on everyday staples like bread and tomatoes. If you are comparing styles, you can see the rest of Misen’s serrated knives lineup in one place.

This small serrated knife uses AICHI ACUTO440 steel, chosen for pro-level sharpness and edge retention. It is also lab-tested for rust resistance, proven to withstand 50 days submerged in water and up to 100 dishwasher cycles. That combination makes it a practical choice for busy kitchens where the knife may see frequent use, quick rinses, or the occasional dish cycle, even though Misen still recommends hand washing for best long-term care.

The 5-inch blade length is especially handy for smaller cutting tasks where a long bread knife feels oversized. Think halving rolls, slicing citrus, portioning small loaves, cutting tomatoes cleanly, or trimming sandwiches without compressing the interior. At 10 inches total length and 4.8 oz weight, it is easy to maneuver on a crowded board, and the ergonomic rounded spine is designed to feel comfortable in a pinch grip.

For day-to-day maintenance, Misen’s guidance is straightforward: hand wash and dry immediately after use, then sharpen about every 4 to 6 months. If you want deeper guidance specific to ACUTO blades, the ACUTO knives care page covers best practices. Misen also notes that high-carbon knives may show discoloration after exposure to acidic foods or salt, which is cosmetic and different from rust.

If you are building out a full kit beyond a serrated utility blade, it can help to compare shapes and sizes across Misen’s broader kitchen knives assortment. This 5-inch serrated option is a focused tool for clean slicing where teeth make the difference, while other knives in the collection cover longer prep, chopping, and general-purpose cutting. Misen backs this knife with a 60-day test drive, lifetime warranty against defects, and free returns.

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

Frequently Asked Questions About 5-inch Serrated Knives

What foods is this 5-inch serrated knife best for?

It is designed to slice crusty, soft, and squishy foods cleanly. The wave-shaped serrations help the blade glide with less tearing, which is especially useful for items like bread and tomatoes mentioned on the product page.

Is the blade actually rust-proof?

Yes, the product is described as rust-proof and its rust resistance is lab-tested. Misen states it is proven to withstand 50 days submerged in water and up to 100 dishwasher cycles, with rust described as extremely rare.

How should I clean and care for it?

Misen recommends hand washing and drying immediately after use. For edge maintenance, they suggest sharpening every 4 to 6 months. For more detailed guidance, Misen directs customers to their ACUTO knives care resources.

Why might the blade discolor after cutting acidic foods?

Misen notes that high-carbon knives can show discoloration after exposure to acidic foods and or salt. They describe this as purely cosmetic and different from rust. Rust is extremely rare based on their stated rust-resistance testing.

What support does Misen offer if I am unsure about the knife?

The product page lists a 60-day test drive, a lifetime warranty against defects, and free returns. Those policies can help if you want to try the knife in your kitchen and confirm it fits your cutting style and routines.