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Home | AZ Knives | AZ Knives 210mm Gyuto UHB20C Honyaki Urunday Handle with Leather Sheat

AZ Knives 210mm Gyuto UHB20C Honyaki Urunday Handle with Leather Sheath No. 4

$528.00
$528.00
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READ IMPORTANT DELIVERY OPTION INFORMATION

AZ honyaki knives are forged from Uddeholm UHB20C—a clean, high-carbon Swedish steel with properties similar to White #2. The steel is differentially hardened using the abura yaki-ire technique, where a clay coating creates a harder edge and softer spine when quenched in oil. The process demands close control over variables like clay application, quench time, and blade geometry.  The result is a durable, high-performance blade with a visible hamon and a hardness of 62–63 HRC.

The handle is made from Urunday, a dense Argentine hardwood also used for the Argentine presidential staff. Known for its exceptional moisture resistance and structural integrity, it’s ideally suited for kitchen use.

Santiago Aberastain handcrafts each knife, handle, and leather sheath in his one-person workshop in Puerto Deseado, Patagonia. His knives are produced without serialized production—defined by their function and style, yet never identical. In addition to his craft, he’s been active in politics for over 13 years, regularly traveling over 3,000 km each month between his hometown and the provincial capital, Río Gallegos. Santiago's work is both a grounding ritual and personal commitment to craftsmanship.



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.

Carbon Steel

Reactive blade.

Convex Grind

Super smooth cutting feel.

Ambidextrous

Suitable for all users.

Gyuto

A Japanese chef’s knife inspired by Western profiles, the gyuto is versatile and balanced. It excels on vegetables, boneless meat, and fish. Its pointed tip allows for precision, while the gentle curve supports rocking cuts.

Listed Length: 210mm
Total Length: 368mm
Edge Length: 217mm
Heel Height: 48mm
Spine Thickness: 2.4mm
Weight:
Orientation: Ambidextrous

Blade Type: Honyaki
Steel Type: UHB20C
Steel Hardness (HRC): 62-63
Maintenance: More Attention
Handle Type: Japanese (wa)
Handle Material: Urunday

  • This is a honyaki forged carbon steel knife.
  • Honyaki knives are made from a single piece of high-carbon steel and require particularly attentive care.
  • Hand wash immediately after use and dry thoroughly with a towel. Do not air dry or place in the dishwasher. The fine steel and hardened edge are prone to rust and chipping if mishandled.
  • Use only on wooden cutting boards and avoid hard, dense ingredients that could cause micro-chipping. If you wouldn't bite into it, don't cut it with this knife.
  • Twisting, scraping, or lateral force will damage the edge.

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



UHB20C

Carbon (C): 0.95–1.05% | Manganese (Mn): 0.3–0.5 | Silicon (Si): 0.2–0.4%

UHB20C is a clean Swedish high‑carbon steel similar to 1095. At ~60–64 HRC it takes a razor edge, sharpens easily, and shows strong edge stability. Not stainless; it patinas readily and needs care—excellent for fine slicers and traditional patterns.



About AZ Knives


AZ Knives is the one-man workshop of Santiago Alberastain, based in Puerto Deseado, Patagonia. Santiago hand-forges each blade—often honyaki-style—from high-carbon steels like UHB20C, then completes all grinding, polishing, and leather sheath work himself. Santiago has been active in politics for over 13 years, regularly traveling over 3,000 km each month between his hometown and the provincial capital, Río Gallegos.His knives blend Japanese influence with Argentine shape and materials with a rugged, minimalist style. Each AZ knife is functional, soulful, and truly handmade. With limited production and a personal approach, AZ Knives reflects a deep commitment to craftsmanship from one of South America’s emerging artisan bladesmiths.

See All AZ Knives