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Home | Japanese Kitchen Knives | Hatsukokuro Sumi 80mm Petty Iron Clad Aogami 2 Kurouchi Wenge Handle

Hatsukokuro Sumi 80mm Petty Iron Clad Aogami 2 Kurouchi Wenge Handle

$103.00
$103.00
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Made for Hatsukokuro in the Tosa region of Shikoku Island in Japan with an iron clad aogami 2 carbon steel core with a wedge handle. These have the black kurouchi finish from the forge left on and are ground with a somewhat basic grind on the wide bevels.

Hand forged knives from the Tosa area of Shikoku Island, Japan's least populated island with a long history of smithing. Shikoku's thick forests, agriculture and fisheries have led to a local style of smithing that is characterized by rustic free forged knives and tools. Many Tosa knives are ryoba style; forged and ground symmetrically and are suitable for both right and left hand users. 



About This Knife

General Purpose

Good for veggies and boneless protein

Avoid Bones & Dense Foods

If you can't bite it, don't cut it.

Iron Clad Carbon

Reactive core steel between two reactive layers.

Wide Kireba Bevel

Smooth, robust cutting feel.

Ambidextrous

Suitable for all users.

Petty

A small utility knife used for delicate work like peeling, trimming, and slicing small produce or herbs.

Listed Length: 80mm
Total Length: 210mm
Edge Length: 83mm
Heel Height: 25mm
Spine Thickness: 1.6mm
Weight:
Orientation: Ambidextrous

Blade Type: Carbon Steel
Steel Type: Aogami 2 (Blue Paper #2)
Steel Hardness (HRC): undisclosed
Maintenance: More Attention
Handle Type: Japanese (wa)
Handle Material: Wenge & Horn Ferrule

  • This is a carbon steel knife made from thin, hard steel.
  • Hand wash and towel dry after use. Do not air dry or place in the dishwasher.
  • Expect oxidation (color change, staining, spotting) with use.
  • Prolonged exposure to moisture or food debris will cause rust; remove any rust with a light abrasive.
  • Remove surface rust gently with a mild abrasive and progress to more aggressive abrasives if needed. Coarse abrasives will leave scratches in most finishes.
  • Avoid twisting, scraping, or use on dense or hard foods and surfaces to avoid early dulling and edge damage. If you wouldn't bite into it, don't cut it with this knife.
  • Use on wooden cutting boards only. Do not use bamboo, plastic, stone or metal cutting surfaces.

Dive Deeper

Medium-fine finish

We recommend sharpening by hand using whetstones starting around 1000 grit progressing to at least 4000 for this steel type and edge geometry. Finish with a monodiachrome strop for a smooth cut with a substantial bite. Finer finishes are possible, but the knife may slide on smooth foods and overall edge retention may suffer. During repair, use a super coarse stone to pass chips quickly to help keep flat bevels.

  • Avoid pull-through sharpeners and non-water-cooled mechanized systems.
  • Strops and ceramic honing rods are preferred for as-needed edge maintenance. If you have to use a honing rod to be able to use the knife comfortably, it's time to sharpen the knife.

Sharpening Supplies

Stones & Accessories selected specifically for this knife.

Arato-kun #220 Extra Coarse Grit Whetstone

Arato-kun #220 Extra Coarse Grit Whetstone

$34.00
$34.00
Bernal Cutlery Takarazukushi 1200 Grit Blue Marble Semi-Soft Ceramic Japanese Whetstone

Bernal Cutlery Takarazukushi 1200 Grit Blue Marble Semi-Soft Ceramic Japanese Whetstone

$74.00
$74.00
Bernal Cutlery Takarazukushi 4000 Grit Yellow Semi-Hard Resinoid Japanese Whetstone

Bernal Cutlery Takarazukushi 4000 Grit Yellow Semi-Hard Resinoid Japanese Whetstone

$82.00
$82.00
Arashiyama #6000 Whetstone Stone NO Wooden Base

Arashiyama #6000 Whetstone Stone NO Wooden Base

$58.00
$58.00
Arashiyama #6000 Whetstone With Nagura Stone and Wooden Base

Arashiyama #6000 Whetstone With Nagura Stone and Wooden Base

$62.00
$62.00
Bernal Cutlery Monodiachrome™ Precharged Deburring Strop

Bernal Cutlery Monodiachrome™ Precharged Deburring Strop

$40.00
$40.00



Aogami 2 (Blue Paper #2)

Carbon (C): 1.1–1.2% | Tungsten (W): 1.1–1.5% | Chromium (Cr): 0.3%

Aogami 2 is a well-balanced Hitachi carbon steel commonly hardened to around 60–63 HRC—about one point softer than Aogami 1—which gives it excellent edge retention with added toughness. Its slightly lower carbon content means it loses its razor edge a bit sooner but holds a strong working edge for long periods, making it a favorite “sweet spot” steel for daily-use kitchen knives. More forgiving and less brittle than Aogami 1, it can take thin edges without chipping and excels in hard-use kitchen or woodworking applications.

Though fully reactive and prone to patina, it sharpens easily to a keen, refined edge and responds beautifully to both fine and toothy finishes. Aogami 2 is widely used by Japanese makers for workhorse knives and is often stainless-clad for user-friendly maintenance.



About Hatsukokoro


Hatsukokoro curates knives from skilled blacksmiths across Japan, bringing diverse regional styles under one name. “Hatsukokoro” means “First Heart,” reflecting a focus on foundational craftsmanship and quality. Instead of forging in-house, they partner with trusted makers to offer a wide variety of blades—each finished and sharpened to the brand’s high standards. Whether sourced from Tosa, Sakai, or Sanjo, Hatsukokoro knives emphasize thoughtful design, practical performance, and consistent quality. It’s a brand for cooks who appreciate variety, craftsmanship, and well-selected tools from across Japan’s knifemaking regions.

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