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  • Serrated Knife - ACUTO440 - New
  • Serrated Knife - ACUTO440 - New
  • Serrated Knife - ACUTO440 - New
  • Serrated Knife - ACUTO440 - New
  • Serrated Knife - ACUTO440 - New
  • A top-down view shows a person slicing a delicata squash with an 8 inch ACUTO440 Misen serrated knife on a wooden cutting board. The squash is yellow with green stripes, and one half of it, with seeds exposed, sits to the right of the knife. The knife has "MISEN" engraved on its blade. To the right of the cutting board, a Misen 18-inch stainless steel roasting pan filled with roasted delicata squash rings, red onion, and herbs is visible. A dark green acorn squash is in the upper right corner of the image.

Serrated Knife - ACUTO440 - New

ACUTO440 Serrated Bread Knife

4.9
Rated 4.9 out of 5 stars
833 Reviews
Regular price
Regular price
$94
Size 5 INCH
Color Blue
  • 60-Day Test Drive

    60-Day Test Drive

  • Lifetime Warranty Against Defects

    Lifetime Warranty Against Defects

  • Free Returns

    Free Returns

Serrated Knife ACUTO440 Description

After 10 years of R&D, the next generation of Misen knives is here—and they’re the best knives we’ve ever made. Our new blades are forged from AICHI ACUTO440, an innovative high-carbon stainless steel that’s also (drumroll, please) totally rust-proof. Add a redesigned pinch grip for added comfort, and the same razor-sharpness and edge retention of our bestselling original knives, and you’ve got a pro-quality knife that you can use every day.

Our Serrated Knife 2.0 is one of the “Big Three” knives every home cook needs (in addition to the Chef’s Knife and Paring Knife). We use ours for so much more than slicing bread: Its sharp, rounded serrations glide through the squishiest of tomatoes, tough pineapple skin, delicate layer cakes, and chopped chocolate for baking.

Why The Serrated Knife ACUTO440 is Great

  • AICHI ACUTO440 Steel: Pro chef-quality Japanese high-carbon stainless steel is hard and durable with great edge retention. (Translation: less sharpening, more cooking.)
  • Rust-Proof (We Tested It!): The blade’s extremely high chromium content (16-18%) means you can cut acidic foods, air-dry, or even run through an accidental dishwasher cycle without a speck of rust.
  • New Ergonomic Rounded Spine - We listened to your feedback and made this our most comfortable knife to hold, even during long prep sessions.

Serrated Knife ACUTO440 Specs

Steel: AICHI ACUTO 440 (Japan)
Country of Production: PRC

8 INCH
Blade Length: 8.1 in. / 208 mm
Total Length: 13.3 in. / 340 mm
Weight: 0.4 lb / 215 g
HRC: 58 / 57
Grind & Edge: Single blade grind, 25 wide Set Serrations

5 INCH
Blade Length: 5 in. / 127 mm
Total Length: 10 in. / 253 mm
Weight: 4.8 oz / 136.1 g
HRC: 58 / 57
Grind & Edge: Single blade grind, 18 wide-set serrations

Use, Care, and Warranty - Serrated Knife ACUTO440

  • Hand wash and dry immediately after use
  • Rust-proof up to 50 days submerged in water; lab-tested to withstand up to 50 dishwasher cycles without rusting.
  • Note: 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.
  • Visit our Use & Care page for more care instructions

Let Us Handle the Sharpening

  • Mail-In Knife Sharpening (on any knife): Free shipping, starting at $11 per knife.
  • We recommend sharpening your knives every 4-6 months.

All Misen Knife products come with a lifetime warranty against defects. For all products, we will replace any defective knives. Learn more about our warranty policy here and what's covered.

How Misen ACUTO440 Knives Stack Up

A comparison chart for knife steel types, including Misen Knives 2.0 (AICHI ACUTO440), Misen Knives 1.0 (AUS10), German Steel (X50CrMoV15), Japanese Steel high-end (VG10), Japanese Steel mid-priced (SUS1A), and Budget Steel (420 SS). It compares maintenance level, rust-proof qualities, sharpening frequency, high durability, and price. Misen Knives 2.0 has low maintenance, is rust-proof, needs sharpening every 4-6 months, is highly durable, and costs $$.

Frequently Asked 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 50 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 50 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.
4.9
Rated 4.9 out of 5 stars
Based on 833 reviews
Total 5 star reviews: 787 Total 4 star reviews: 39 Total 3 star reviews: 7 Total 2 star reviews: 0 Total 1 star reviews: 0
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833 reviews
  • Edward J. R.
    Flag of United States
    Verified Buyer
    Reviewing
    Serrated Knife - ACUTO440 - New
    I recommend this product
    Product Standouts sharp, easy-to-use, good balance, sleek design, comfortable handle
    Rated 5 out of 5 stars
    3 minutes ago
    Serrated knife

    Great knife, especially good for cutting round loaves of bread

    Was this helpful?
  • Jeffrey L.
    Flag of United States
    Verified Buyer
    Reviewing
    8 inch Serrated Knife - AUS-8 - Final Sale
    I recommend this product
    Rated 5 out of 5 stars
    Yesterday
    Great knife

    No longer struggling with crusty sourdough. Goes right through the harder parts with little sawing.

    Was this helpful?
  • Adam W.
    Flag of United States
    Verified Buyer
    Reviewing
    10 inch Serrated Knife - AUS-8 - Final Sale
    I recommend this product
    Product Standouts sharp, easy-to-use, comfortable handle, well-priced
    Rated 5 out of 5 stars
    4 days ago
    Smooth, precise, and eminently serviceable

    We've got a Henckels 8" bread knife that has gone through a lot of carbs in the last fifteen years. Recently a fantastic bakery opened up nearby with a signature sourdough sandwich loaf that is just too large and too soft on the inside for that blade to handle. Our knife block has one extra-long slot I could free up, so last week I ordered this beastie. It's absolutely phenomenal! No tearing, easily-controlled thickness, and quick easy slicing -- I'm a big fan. So glad it was an option; we'll probably pass it on to our nephew in thirty years. It's that good.

    Was this helpful?
  • SEan c.
    Flag of United States
    Verified Buyer
    Reviewing
    8 inch Serrated Knife - AUS-8 - Final Sale
    I recommend this product
    Product Standouts well-priced, sharp, premium materials, nice weight
    Rated 5 out of 5 stars
    5 days ago
    Great Knives

    I have a growing set of Misen knives and I love them. So much so that move in gifts, wedding gifts, etc for me are Misen knives. Great price, great knife! Everyone is always impressed.

    This knife is one of 3 that I purchased as a gift for friends to help celebrate the renovation of a beach house that we get to enjoy with them every chance we get. Every house needs a quality knife set and that is Misen for me.

    Was this helpful?
  • Dorothy I.
    Flag of United States
    Verified Buyer
    Reviewing
    10 inch Serrated Knife - AUS-8 - Final Sale
    I recommend this product
    Product Standouts sharp, nice weight, well-priced, premium materials, easy-to-use
    Rated 5 out of 5 stars
    5 days ago
    Very sharp

    I specifically bought this knife to cut into my crusty sourdough bread and it works like a champ. I don’t have to saw the bread the knife just goes right straight down through to the bottom. Love it!

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