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.
Hybrid blade shape for rocking, chopping, drawing, and slicing
Ergonomic rounded spine and bolster for a more comfortable pinch grip

Rust-Proof

ACUTO440 Steel

All Chop Styles

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

Mail-In Knife Sharpening (on any knife)
Free shipping, starting at $11 per knife.

Specifications

Blade Length: 8.26 in. / 210 mm

Total Length: 13.5 in. / 345 mm

Handle Thickness: 18 mm

Blade Height: 49 mm

Weight: 0.5 lb / 230 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.

See it in action

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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.

What Makes the Blue Acuto 8" Chef’s Knife Stand Out

The 8" Blue Acuto Chef's Knife is crafted from ACUTO440 steel, a high-carbon stainless alloy that maintains a keen edge through demanding daily use — whether you're working through a pile of vegetables, portioning proteins, or tackling more delicate knife work. The 8" blade strikes the right balance for most home cooks: enough length to handle large cuts efficiently, enough control for tasks that demand precision.

When your prep calls for more controlled, close-range cuts, the 5.5" Utility Knife in Blue is the natural next addition — it shares the same ACUTO440 construction and keeps your collection visually consistent. Cooks looking to build out a full set can find everything they need in the 7-Piece Blue ACUTO440 Knife Set. Regular honing and hand-washing are all it takes to keep this knife at its best.

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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.

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?

Customer Reviews

4.9

Rated 4.9 out of 5 stars

Based on 8,648 reviews

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4 Rated out of 5 stars

705

Total 4 star reviews: 705

3 Rated out of 5 stars

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Total 3 star reviews: 114

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Total 1 star reviews: 0

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8,648 reviews

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Chris G.

Verified Buyer

I recommend this product

Rated 5 out of 5 stars

6 years ago

Great knife!

Love the feel, balance and sharpness! I will be buying more Misen knives in the future.

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Yes, this review from Chris G. was helpful. 10 people voted yesNo, this review from Chris G. was not helpful. 2 people voted no

Juan C.

Verified Buyer

I recommend this product

Product Standouts sharp, easy-to-use, comfortable handle, good balance, nice weight

Rated 5 out of 5 stars

1 week ago

High quality blade

The 8 inch chef's knife feels like an extension of my hand. It's balanced and comfortable anyway I hold it. The blade is heavy enough for my everyday needs.

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Devon D.

Verified Buyer

I recommend this product

Product Standouts comfortable handle, sharp, premium materials

Rated 5 out of 5 stars

2 weeks ago

Love this knife

I have two of the same knife as it's my most used. Also received great customer service from Misen as I've been a customer for a few years.

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Valerie J. P.

Verified Buyer

I recommend this product

Rated 5 out of 5 stars

2 weeks ago

A great knife

I am slowly collecting! I’m not short of knives so I donate to my adorable cleaner and buy a new one! Are these good? No, they are brilliant! Keep them coming Misen!

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Yes, this review from Valerie J. P. was helpful. 1 person voted yesNo, this review from Valerie J. P. was not helpful. 0 people voted no

Don A.

Verified Buyer

I recommend this product

Rated 5 out of 5 stars

2 weeks ago

Great addition

I bought this to replace a chef's knife I was unhappy with plus I got this knife at a very good deal. So far, I am very impressed with this knife.

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