imarku 8 in Japanese Chef Knife Gyuto (7Cr17MoV)

The steel and how it holds up

7Cr17MoV is a corrosion-resistant stainless, the Chinese counterpart to 440A with vanadium added: about 0.7% carbon, typically hardened to 56–58 HRC. It takes a fine edge and is famously easy to resharpen, but edge retention is only adequate. A 2025 test had the edge lasting roughly a week before a few passes on a ceramic steel brought it back; a 7Cr17MoV steel guide recommends honing before each cook. Owners who want to sharpen rarely should look at harder steels. Nobody has published a failure rate, and the softness is deliberate: the edge rolls rather than chips.

The evidence base is thin but consistent. The Rational Kitchen tested five imarku knives with a BESS C sharpness tester in May 2025: the 8-inch gyuto measured 250 g out of the box, 6.6 oz on a scale and 2.5 mm at the spine, held an edge about a week, and cut chicken bones and hard squash. The same test called the fit and finish mediocre — an unpolished square spine, a sharp heel, rough seams where the handle meets the blade and end-cap — and found the balance leaned toward the handle.

Sharpening and upkeep

Imarku’s care guidance is ordinary for a wood-handled knife: no dishwasher, wash in soapy water and dry immediately, hone before each use, cut on a proper board and store where the blade cannot contact other objects. Because the steel is soft, edge maintenance is low-effort but frequent — regular honing, occasional stone work, and the edge comes back in a couple of minutes on a stone. There is no parts ecosystem; the knife is cheap enough that replacement competes with professional sharpening. A 1,000-grit Shapton waterstone is listed at $42 at ChefKnivesToGo, and a Mercer 8 × 2 in blade guard at $2.69 at WebstaurantStore or $2.95 at KaTom.

Is it worth it?

At $40 or less the knife is strong budget value: class-verified out-of-box sharpness, a pakkawood handle and a forgiving steel. From $41 to $50 it is fair — the 2016 professional review at about $50 called it adequate for home cooks but limited for dense produce or professional use. From $51 to $70 it is weak: imarku’s own store lists the P8 at $69.99 sale against a $139.99 regular price, with a $49.99 member price, and at that level it stops undercutting the alternatives. The red-handle version shows the same $69.99 sale against a $89.99 regular. Above $70 it is not defensible; the knife’s reputation rests on sub-$40 sale pricing.

Mercer’s Millennia 8-inch M22608 is $18.99 at WebstaurantStore or $24.95 at KnifeCenter, and the Victorinox Fibrox 8-inch 5.2063.20 is $67 direct with a lifetime warranty.

Which model this is

This page covers the imarku 8-inch gyuto, currently sold as the Phantom Series P8. The same ASIN has been listed since at least 2016, and the published specs have drifted since: blade thickness went from 2.2 mm to 2.3 mm, weight from 8.2 oz to 6.6 oz and hardness from 58–60 to 56–58 HRC. Do not merge it with imarku’s Damascus lines, which are 61–65 HRC, powdered-steel knives at 13–15° with 8.5–9 oz weights. The listing used here is ASIN B01DDBJF12.

Sources

Manufacturer:

• imarku 8-inch Japanese chef knife, Phantom Series P8
• imarku Pro kitchen knife 8-inch gyuto, red handle
• imarku knife use and care
• imarku knife care tips
• imarku warranty policy
• imarku refund policy
• imarku FAQ

Independent reviews:

• Imarku knives: are they any good? — The Rational Kitchen
• 7Cr17MoV steel: hardness and edge retention — The Cooking Guild

Owner reports:

• Recommendations buying (r/chefknives)
• Decent chef’s knife on Amazon Prime Day? (r/Cooking)

Parts and stores:

• Shapton Pro 1000-grit waterstone — ChefKnivesToGo
• Mercer M33113P 8 × 2 in blade guard — WebstaurantStore
• Mercer M33113P blade guard — KaTom
• Mercer Millennia 8-inch M22608 — WebstaurantStore
• Mercer Millennia M22608 — KnifeCenter
• Victorinox Fibrox 8-inch 5.2063.20 — Victorinox