SKU: 55070002213

Hatsukokoro "Kokugei" Aogami #1 Kurouchi 120mm Petty

Sale price$62.06 Regular price$68.95
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Ships within 48 hours · Estimated delivery Aug 21 - Aug 26

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Description

Hatsukokoro "Kokugei" Aogami #1 Kurouchi 120mm PettyCrafted from high quality Aogami #1 steel, this Hatsukokoro "Kokugei" Petty (also known as the "Black Whale" in Japanese) has been heat treated to a hardness of 62 HRC. Its distal tapered design ensures a seamless cutting experience, while the rough black kurouchi finish exudes the traditional aesthetics of hand forged Japanese carbon steel blades. During quenching, the uneven temperature distribution over the blade results in a gradient of colors

Crafted from high-quality Aogami #1 steel, this Hatsukokoro "Kokugei" Petty (also known as the "Black Whale" in Japanese) has been heat-treated to a hardness of 62 HRC. Its distal-tapered design ensures a seamless cutting experience, while the rough black kurouchi finish exudes the traditional aesthetics of hand-forged Japanese carbon steel blades. During quenching, the uneven temperature distribution over the blade results in a gradient of colors resembling a rainbow, making the knife uncoventionally appealing. This Santoku knife is not only easy to handle but also offers great value, making it an ideal choice for newcomers to carbon steel knives.

 

Spec:

  • Origin (Made in): Tosa, Kōchi Prefecture, Japan
  • Brand: Hatsukokoro
  • Knife Type: Petty
  • Blade
    • Construction: Sanmai
    • Grind: Double-edged Blade (50/50 Grind)
    • Hagane (Core Steel): Aogami #1 (Blue #1)
    • Jigane (Cladding): Soft Iron
    • Hardness: 62 HRC
    • Hand-forged, hand-ground, hand-sharpened
  • Blade Finishes:
    • Kurouchi
  • Blade Length (heel-to-tip): 120mm (4.7")
  • Blade Height (at heel): 39mm 
  • Spine Thickness
    • Above heel: 2.4mm 
    • Middle: 1.9mm 
  • Handle
    • Shape: Hachikaku (Octagonal)
    • Material: Ebony
    • Length: 115mm 
  • Overall Length: 251mm 
  • Weight: 96g (3.38oz) 
  • Engraved Mark (Front): In Japanese Kanji "Trademark Hatsukokoro" (登録 初心)


Care:

Aogami #1 (Blue #1) steel is a premium Japanese high carbon steel for knife making. Despite some corrosion resistant quality (for a carbon steel), it is not stainless, therefore you should wipe your knife dry after each use. Patina will develop over time. Rust may develop if left in prolonged contact with water or acidic food. Use a rust eraser to clean if rusts develop. Avoid cutting into bones, frozen foods, hard fruit pits.

Cutting Surface:

Recommended cutting surface: wood, rubberized boards and high-end composites, and quality plastics such as polyethylene make acceptable cutting surfaces, and will help protect and prolong knife’s edge. AVOID glass, metal, countertops, and other rigid, non-forgiving surfaces.

Sharpening:

We recommend sharpening all quality Japanese knives on whetstones, as we believe they yield the best results for your knives. 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 55070002213

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CeleryGreen
Port Orchard, US
★★★★★ 5
So far, so good!
Pattern Name: 3 Large balls, Pattern Name: 3 Large balls
Boomer an 8 yr old male Chesapeake Bay Retriever, 105#. When Boomer isn’t duck hunting, he is all about THE BALL. He chews them apart like I own stock. DAY 1 : I’m impressed with the Mankoda . It’s still in one piece. Barely any show of wear. Boomer is carrying it around like a prize, definitely having “a ball”. Needless to say he is loving it. The bright colors are easy to see in the yard. We haven’t played outside so I can’t comment on the bounce. I got the three pack and I feel it’s a reasonable price. I ordered the large ball because Boomer is a big boy. The ball its self is foamy soft to the touch but very firm . Has no smell at least that I can detect . It has little indents on the surface, I agree (with the info) that it will help rub against my boys teeth (brushing time reduced!). You can see them in the picture (the indents not the teeth). The divots you see are from Boomer. But no real damage. I’ll keep updating for a while.
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Reviewed in the United States on May 11, 2026
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Ohio Treasure Chest
Massapequa, US
★★★★★ 5
Quality ball - Heeler approved
Pattern Name: 4 Medium balls
My heeler loves this ball He is a huge baller and this balls holds up. Bounces great. Takes a chewing. It’s also lightweight, which is good, because sometimes my aim is bad. The 2.5” is big enough to not roll under the couch. Awesome. The best part is, he has a stash of replacements ready for when he loses it.
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Reviewed in the United States on January 15, 2026
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Marcus Scott
Fort Morgan, US
★★★★★ 5
Best dog ball ever!
Pattern Name: 3 Large balls
We have a border collie and an Australian cattle dog. Both are obsessed with balls and love to play catch. They would destroy all tennis ball including ones for dogs within minutes. These have lasted over a year! They have some teeth marks but still work great! I have just bought a second set as they still tend to get lost from time to time.
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Reviewed in the United States on May 23, 2026
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Amazon Customer
Carnegie, US
★★★★★ 5
These are worth the money!! BUY THEM!!
Pattern Name: 3 Large balls
These balls are amazing if you have a dog that likes to chew! We have 2 medium sized breeds that are heavy heavy chewers and they get so excited when we dig these out from under the couch or tv stand. Most "chew toys" have to find their way to the garbage within a few days. We've had these a little over 2 weeks now and they are holding up great. There are little teeth marks in them but no chunks ripped out and seem to be holding up great. They are a little squishy so I was worried they would get destroyed but nope. They are a little bigger than a tennis ball so I don't have to worry about them choking on them. JUST BUY THEM!!
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Reviewed in the United States on April 6, 2026
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Mare Bear
Pawtucket, US
★★★★★ 5
Nice Ball
Pattern Name: 1 Large ball
Nice light, yet durable ball for my gs/pit mix. He's a year and a half and he plays hard. I really like this ball and I'd buy it again.
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Reviewed in the United States on May 7, 2026

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