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Home | Japanese Kitchen Knives | Morihei Hisamoto 135mm Petty Iron Clad Shirogami 1 Kurouchi Pakka Hand

Morihei Hisamoto 135mm Petty Iron Clad Shirogami 1 Kurouchi Pakka Handle

£131.80
£131.80
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Hand forged iron clad shirogami 1 blade with riveted pakka wood handle made in Kanto area. Heat treated to bring out the best possible edge retention and edge formation, these are very rewarding to sharpen even though the very high carbon content shirogami 1 steel is a little more work to remove metal on, it polishes very nicely and can work with a very large variety of finishes for different cutting feels, especially great with natural stones. 

The quality of the blade on these far outstrips the handle which is somewhat simple, making a good opportunity to work with an excellent forged knife at a lower price. 


Everyday Prep

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: 135mm
Total Length: 242mm
Edge Length: 134mm
Heel Height: 33mm
Spine Thickness: 2.5mm
Weight:
Orientation: Ambidextrous

Blade Type: Iron Clad Carbon
Steel Type: Shirogami 1 (White Paper #1)
Steel Hardness (HRC):
Maintenance: More Attention
Handle Type: Western
Handle Material: Pakka

  • 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 - Japanese

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

£25.90
£25.90
Bernal Cutlery Takarazukushi 1200 Grit Blue Marble Semi-Soft Ceramic Japanese Whetstone

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

£56.38
£56.38
Bernal Cutlery Takarazukushi 4000 Grit Yellow Semi-Hard Resinoid Japanese Whetstone

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

£62.47
£62.47
Arashiyama #6000 Whetstone Stone NO Wooden Base

Arashiyama #6000 Whetstone Stone NO Wooden Base

£44.19
£44.19
Arashiyama #6000 Whetstone With Nagura Stone and Wooden Base

Arashiyama #6000 Whetstone With Nagura Stone and Wooden Base

£47.24
£47.24
Bernal Cutlery Monodiachrome™ Precharged Deburring Strop

Bernal Cutlery Monodiachrome™ Precharged Deburring Strop

£30.47
£30.47

Shirogami 1 (White Paper #1)

Carbon (C): 1.25–1.35% | Manganese (Mn): 0.2–0.3% | Phosphorus (P/S): trace

Shirogami 1 is an ultra-pure high-carbon steel (~1.25–1.35% C) from Hitachi, delivering extreme sharpness and easy honing. Capable of ~65 HRC, it’s used for razors and fine kitchen knives. Its low impurity content yields an exceptionally fine grain but requires vigilant maintenance to prevent rust.

About Morihei

Tokyo, Japan

Tokyo-based Morihei has been a cornerstone of the knife and sharpening world for over a century. Originally a cutlery and whetstone supplier, Morihei works with trusted blacksmiths—often behind the scenes—to produce house-branded knives like the Morihei Hisamoto line. Their in-house sharpening team ensures every knife arrives with a fine edge, often honed on natural stones. Morihei’s expertise in sharpening is unmatched, influencing their blade geometry and finish. For those who value edge quality and subtle refinement, Morihei knives represent a deep well of traditional knowledge and quiet excellence.

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