SKU: 1215456537

Kogetsu / Goko Hamono Shirogami #1 Nashiji 150mm Petty

Sale price$152.10 Regular price$169.00
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Description

Kogetsu / Goko Hamono Shirogami #1 Nashiji 150mm PettyHandcrafted by Yoshito Yamakawa, this Petty features a Shirogami #1 steel core, clad in stainless steel with an elegant Nashiji finish. The blade is heat treated to 62 63 HRC, which ensures pretty good edge retention; and the fit and finish is decent for its price. Measuring just 2. 8mm at heel and 1. 7mm in the middle of the blade, the exceptionally thin behind the edge and the beautiful distal tapering allows the knife to deliver a smooth cutting

Handcrafted by Yoshito Yamakawa, this Petty features a Shirogami #1 steel core, clad in stainless steel with an elegant Nashiji finish. The blade is heat-treated to 62-63 HRC, which ensures pretty good edge retention; and the fit and finish is decent for its price. Measuring just 2.8mm at heel and 1.7mm in the middle of the blade, the exceptionally thin behind-the-edge and the beautiful distal tapering allows the knife to deliver a smooth cutting performance. The blade is paired with an octagonal wa-handle that's made with wenge wood with a buffalo horn kuchiwa.

Spec:

  • Origin (Made in): Kashiwa, Chiba Prefecture, Japan
  • Brand: Goko Hamono
  • Craftsman: Yoshito Yamakawa (八間川 義人) aka Kogetsu 
  • Knife Type: Petty
  • Blade
    • Construction: San Mai
    • Grind: Double-edged Blade (50/50 Grind)
    • Hagane (Core Steel): Shirogami #1 (White #1)
    • Jigane (Cladding): Stainless Steel
    • Hardness: 62-63 HRC
    • Hand-forged, hand-grinded, hand-sharpened
  • Blade Finishes: Nashiji
  • Blade Length: 150mm (5.9")
  • Blade Height (at heel): 36mm
  • Spine Thickness
    • Above heel: 2.8mm
    • Middle: 1.7mm
  • Handle
    • Shape: Hachikaku (Octagonal)
    • Material: Wenge / Walnut
    • Kuchiwa: Buffalo Horn
    • Length: 122mm
  • Overall Length: 282mm
  • Weight: 82g (2.89oz)
  • Engraved Mark (Front): In Japanese Kanji "Shimosa Province Kogetsu Made" (下総国 光月作)
  • Engraved Mark (Back): In Japanese Kanji "Shirogami #1" (白紙一号)

About Goko Hamono 五香刃物

Gokou Hamono is a tiny knife making workshop located in Kashiwa City, Chiba Prefecture that is run by Norihiko Yamakawa (八間川憲彦) and Yoshito Yamakawa (八間川義人), the father and son team. Norihiko Yamakawa (the father) first founded Gokou Hamono in 1990 as a cutley wholesaler, before turning it into a knife making workshop in 1995 with the help from blacksmith Moriei Seki (関守永). Yoshito Yamakawa (the son), a high school student at that time, shadowed his father and eventually became a blacksmith himself. “Telling no lies” and “Dedication” are Gokou Hamono’s philosophy. The father and son team would not call themselves “masters”, because they think one will always have room to improve, and self-pride would hinder self-reflection. As a result, Gokou Hamono’s knives can only get better and better in the future. Only knives made by Yamakawa-san are engraved Kogetsu Made (

光月作).

Care:

Shirogami #1 (white #1) steel is one of the popular types of high carbon steel found in Japanese kitchen knives (Wa Knives). It is not stainless, therefore you must wipe your knife dry after each use, in particular the core steel not covered by the stainless cladding. Patina will develop over time, which will appear as “discoloration” on the cutting edge, but that is the nature of carbon steel - not a defect. The stainless cladding covers a large part of the blade, making maintenance easier but still preserving the cutting and sharpening pleasure of the Shirogami core. 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: 1215456537

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West Palm Beach, US
★★★★★ 5
Pattern and roughness appropriate but still need to test
I haven't had a flat tire yet, so I also haven't had occasion to test these but they seem like great value for an extremely low price (especially versus a new tire.) I have handled them to try and gauge how quickly they'd smooth a hole, and they're rough / sharp and aggressive enough that I expect them to work quickly and well on not only tires, but on a variety of other materials. This pattern in particular should allow material to be shed and then passed backward pretty easily without clogging things up or slowing them down. If you've bothered to buy a patch kit for your tires, you really ought to have one of these around.
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Reviewed in the United States on January 18, 2026
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Don
Carnegie, US
★★★★★ 5
Thank you!
Size: 1/4-Inch - With Adapter
Thank you!
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Reviewed in the United States on April 27, 2023
K
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Ken C.
Louisville, US
★★★★★ 5
Makes plugging easy
Size: 1/4-Inch - With Adapter
Screw that T handle punch tool!!
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Reviewed in the United States on April 4, 2021
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B Rukaz
Louisville, US
★★★★★ 5
as advertised
As advertised
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Reviewed in the United States on June 2, 2026
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Drewski
Alexandria, US
★★★★★ 5
Great value, easy to use, and do a great job.
Great for tire repair! It fits in any drill in a snap, so you are able to ream the hole out in a tire so you can patch and repair the tire. My shop used these all the time, and never had any issues with them. They hold up well, and do the trick for just about any size hole in a tire. Great buy!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 27, 2026

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