HAP-40 Nakiri Black 170mm (6.7") - blade
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HAP-40 Nakiri Black 170mm (6.7") is a kitchen knife from our new HAP-40 series which we designed in collaboration with the Yoshida Hamono smithy. This nakiri will make your vegetables fly. With this series, we fused Japanese tradition and knowledge of blade design and materials processing, and what came out is a versatile kitchen knife made of powder steel that is simple to use and maintain. To top it off, it boasts incredible properties, characteristic of only the best performing and most practical Japanese blades!
HAP-40 Nakiri Black embodies the best characteristics we could possibly expect from a kitchen knife:
The nakiri shape was designed for cutting vegetables and is perfect for either long or short cuts, while the thin tip allows for precise work. Nakiri aka Nakiri Bocho is a traditional Japanese knife with a square, thin blade and a deep, flat belly. Since the entire flat edge of the knife touches the cutting board at once, in one clean, vertical movement, there is no need for a horizontal pull or push. This also means that you won’t be turning the vegetable into an “accordion” of pieces still clinging together by a thread. Due to its characteristics, it’s mostly intended to be used for chopping veg, but you can still use it as a good all-rounder in the kitchen.
→ When translated, the name Nakiri Bocho (菜切り包丁) literally means “vegetable chopper”. Na means “vegetable” and kiri means “chopper”. As its name suggests, it works perfectly for chopping, slicing and dicing greens.
This knife is without a handle so you can fit your own. Browse our selection of handles and create your own, custom-looking knife! If you would like that we fit the selected handle to the blade for you, select Handle fitting service when adding the blade to the cart.
The secret of this knife lies in extremely (68 HRC!) hard core made of a somewhat exotic and currently one of the most mysterious and attractive steels produced in Japan (at least as far as kitchen knives are concerned): Hitachi’s HAP-40 steel that fits into the category of modern and technologically advanced steels. HAP-40 is fine-grained enough to sharpen very well, and knives from this steel keep their sharpness three to five times longer than traditional knives. An interesting fact is that, considering it is a powder steel, it has an extremely small content of chromium (around 4%) and can react as a high-carbon steel in specific circumstances.
This steel is heat-treated to an incredible 68 HRC, yet it can still be relatively easily sharpened on whetstones. It is extremely tough, and so not as likely to chip along the edge as the steel used in traditional knives.
🦉 As the technological development progresses, many new types of steel (ZDP-189, HAP-40, R2, Super X etc.) have come to light. They rate as high as 64-68 on the Rockwell scale (HRC) and possess staggering properties. Knives carefully crafted from powdered steel are the crème de la crème of kitchen tools and offer incredible cutting performance and edge retention.
Higher hardness value in knives means..?
✅ Higher hardness value ➨ long-lasting sharpness
→ More about HRC and hardness here!
Blacksmiths counter the brittleness of material that a higher value of HRC involves with special composition of the knife. The blades are laminated which means that they are not composed of only one type of steel but several layers of different steels. In the case of HAP-40 series, Osamu-san chose a WARIKOMI (also called “split and insert”) method. A glowing hot piece of iron is split and a piece of steel is inserted. The new material is now forged into one piece composed of a very hard steel core in a jacket of two external layers of softer, stainless steel. This creates a highly durable kitchen knife with a slightly more pliable core. The main advantage of these knives is that they are thin, sharp and retain their edge very well.
Lamination is a very challenging process in steel processing, therefore most blacksmiths buy already laminated steel sheets which they made into blades. HAP-40 is known as an incredibly demanding material to process, forge and quench and so remains a rare component in Japanese knives despite its stellar characteristics. Yoshida Hamono has a wealth of experience in processing powder steels and is also the only smithy that laminates its own ZDP-189 and HAP-40 steels, allowing it to adjust the method of lamination to the shape of the blade.
→ Are you interested in learning more about blade construction and lamination? Read our article Blade construction: Lamination
Regardless of the high HRC value of HAP-40 steel, its chemical composition ensures decreased brittleness, while a low content of chromium means that it can acquire a patina!
COMPOSITION: 1.27–1.37% carbon (C), 3.70–4.70% chromium (Cr), 5.60–6.40% tungsten (W), 4.60–5.40% molybdenum (Mo), 2.80–3.30% vanadium (V) and 7.50–8.50% cobalt (Co).
If your work in the kitchen calls for a knife with good edge retention, HAP-40 steel offers a good alternative and an upgrade to ZDP-189 steel. We mostly had in mind professional chefs when choosing the material, but undoubtedly it will be a joy to wield by all serious knife enthusiasts, especially those who appreciate exotic and collectors’ items.
It has a double bevel (symmetrical) blade and, according to its cross-section and the location of the shinogi line (where the angle of the surface changes), its shape is concave:
→ The part of the blade below the shinogi line is of concave shape. This kind of concave or hollow grinds finish in a very thin and extremely sharp point, so the blade remains sharp for a very long time despite frequent sharpening. This thin profile gives the impression that a knife is sharp even though it’s already ripe for sharpening.
The blade has a dark finish which is the reason why this look is also called kuro-uchi - the word “kuro” means black. This look is traditional and robust, with an unprocessed top part of the blade that has already developed a dark patina.
🦉 During the forging process, the knives are exposed to tremendous heat and flames so that the iron on the surface oxidizes and turns black. During the later processing, the surface is thinned and polished to bring out the reflective and shiny nature of the blade. If the desired end results is the kuro-uchi finish, the upper part of the blade is no longer polished in the later stages of the process.
This look is somewhat robust and organic, but it has a purpose – it will minimize the reactivity of a carbon steel knife and reduce the risk of corrosion compared to knives with a high polish finish. This dark “patina” is also applied to knives made of stainless steel and its sole function is style and aesthetics.
→ You can find out more about the final look of the blade in article Blade construction: Blade finish
Knives made of HAP-40 steel were made with professional users in mind. We took advice from our chefs to heart and drew on their extensive experience in using Japanese knives. They are the ones who exactly know what properties a blade must possess so they can prepare food efficiently and effectively. When choosing the material and also design of the blade, we put together our knowledge, our user’s requests and the Japanese tradition in the forging of most demanding materials. And what is the final result? An unsurpassable quality and versatile use in just one, perfect blade!
About Yoshida Hamono:
The knife is manufactured at the smithy of Yoshida Hamono in Japan, a family company with an age-long tradition in manufacturing state-of-the-art tools and Japanese swords, i.e., katanas, by hand. Yoshida Hamono has a great deal of experience forging ZDP-189 steel in the traditional manner.
|Hardness (HRC scale):||68
|Overall length:||260mm (10.3")|
|Blade length:||170mm (6.7")|
|Spine thickness:||2.1mm (0.08")|
|Weight:||135g (4.8 oz)|
|Handle type / wood:||no handle|
|Handle size recommendations:||M|
Use & Care:
- Handwash in warm water and towel dry
- Use a sharpening stone (not a honing steel!) to sharpen your knife
- Do not cut frozen foods and meat bones
- Do not put the knife in a dishwasher
- Read our comprehensive guide on proper Maintenance of Kitchen Knives.
Still doubting which type of Japanese knife should best fit your needs? We created a quick, 5-steps quiz to help you find the perfect knife based on your cooking skills and the type of food you prepare.
Ordering procedure was very easy and fast. Shipped to Italy in few days. I highly recommend SharpEdge!
Excellent knive and excellent service from the guys. All wrapped in a japanease newspaper that give a touch of authenticity. Bought a beautifull hokiyama santoku in ginsanko. Knife arrived rasor sharp.
Another beautiful Knife, delivered super fast and the Okinawa Reef handle really adds to the quality look and feel.
Perfect for those smaller more delicate cutting/slicing jobs.
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This 6.5" knife with the Tokyo Night handle is very impressive looking. It is very sharp and has a top quality solid build.
Fantastic for vegetables etc, looking forward to many years of use.
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The knife came as advertised in just a few days from our order. Not only is it pretty and very very sharp but it weighs just a few ounces. We might not be cutting a lot of prosciutto with it, but it will find its way to other uses. We love it! Enjoyed doing business with you.
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