Sukenari (佑成) HAP40 HSPS Petty 165mm
Sukenari (佑成) HAP40 HSPS Petty 165mm
Sukenari (佑成) HAP40 HSPS Petty 165mm
Sukenari (佑成) HAP40 HSPS Petty 165mm
Sukenari (佑成) HAP40 HSPS Petty 165mm

Sukenari (佑成) HAP40 HSPS Petty 165mm

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I am glad to bring you the latest Sukenari offering: the HAP40 High Speed Tool Steel by Hitachi. The HAP40 is a powdered semi-stainless steel, has only about 4% of Chromium. The high Chromium content in stainless steel tends to stick to food and gives a wired sharpening feedback; the HAP40 in contrast behaves like carbon steel yet it won’t rust as easily as traditional carbon steel. One could almost get away with any rust developing on the blade as long as it is cleaned and wiped dry after each prep.

The HAP40 line is heat treated to a staggering HRC 68 +- 0.5. (If you have any double of this, you should read this blog). This is even higher than the Sukenari’s famous ZDP189 line (HRC 66) and the now discontinued Aogami Super Damascus line (HRC 67). You may wonder this is going to be a nightmare to sharpen (since the ZDP189 is bad enough already), but the truth is, it wasn’t that bad. My experience with the Sukenari HAP40 is that it sits between SG2 and ZDP189 in terms of how easy to sharpen. Because the HAP40 is a highly alloyed steel, it won’t be as chippy as the ZDP189 or the water-quenched Aogami Super.

As always, the grind of Sukenari is not the thinnest out there but to me it is still thin enough for most users. The 240 that I tried goes through potato effortlessly, thanks to the super sharp OOTB edge and a very nice geometry. If your task requires an extreme edge retention, the new HAP40 line from Sukenari is a very good alternative (upgrade) to the ZDP189 line.




93 g

Total Length

293 mm

Tip to Heel Length

160 mm

Blade Height at Heel

29 mm

Width of Spine Above Heel 

2.3 mm

Width of Spine at Middle of Blade

2.0 mm

Width of Spine at about 1cm From the Tip

1.0 mm


Hitachi HAP40 High Speed Powdered Steel


HRC 68 +- 0.5

Handle Design

Ebony with black ferrule, single white spacer 



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