Buying a Japanese Knife: What Sakai and Seki Actually Sell You

Descended From Swords When the Meiji government banned the wearing of swords in 1876, swordsmiths in towns like Seki and Sakai turned to blades people still needed: kitchen knives, scissors, tools. That lineage is why Japanese knives use hard, high-carbon steel taken to a much higher hardness than Western knives — typically around 60–64 on the Rockwell scale versus 54–58. Harder steel holds a far finer edge, and is more brittle in exchange.

Single Bevel vs Double Bevel Traditional Japanese knives — yanagiba for slicing sashimi, deba for breaking down fish, usuba for vegetables — are sharpened on one side only. That geometry lets the blade separate cells rather than crush them, which genuinely changes how fish tastes, but it's handed (right or left), demands technique, and requires learning to sharpen. Double-bevel knives — the gyuto (chef's knife), santoku, and petty — are the modern hybrids, sharpened on both sides like a Western knife but with Japanese steel and a much thinner blade. For almost every visitor, a gyuto or santoku is the right buy.

The Towns Sakai in Osaka has made blades since the 16th century and is overwhelmingly the choice of professional Japanese chefs, with a division of labour where forging, sharpening and handle-fitting are done by different specialists. Seki in Gifu is the other great center, dating to the 13th century and now home to both traditional smiths and Japan's largest knife manufacturers. Both have museums and shops where you can watch sharpening.

Carbon vs Stainless, Honestly Carbon steel takes the sharpest edge and is what traditionalists use — but it rusts if you leave it wet for ten minutes, and it will stain. Stainless and clad options are marginally less keen and dramatically more forgiving. If you won't wipe your knife dry after every use, buy stainless and don't feel bad about it.

The Single Most Important Distinction Before anything about steel or towns, understand single-bevel versus double-bevel. A double-bevel knife — gyuto, santoku, petty — is ground on both sides like a Western knife and cuts straight down. A single-bevel knife — yanagiba, deba, usuba — is ground on one side only, is handed, and steers in the cut, which is exactly what you want when slicing sashimi off a fillet and exactly what you do not want when dicing an onion.

Most visitors who come home disappointed bought a beautiful single-bevel knife and then tried to use it as a general kitchen knife. Unless you are breaking down whole fish, you want a double-bevel gyuto or santoku.

Carbon or Stainless, and Be Honest With Yourself Carbon steel takes a sharper edge, is easier to sharpen, and will rust if you leave it wet for ten minutes. It also develops a patina that many people like and some find alarming. Stainless is slightly harder to bring to the same edge and far more forgiving of ordinary life.

There are laminated compromises — a hard carbon core clad in stainless, which gives you the edge with most of the convenience — and for a first Japanese knife these are usually the right answer. What matters is deciding truthfully whether you will wipe a blade dry every time you use it.

The Handle and the Sharpening Japanese wa-handles are usually a simple wooden octagon or oval, friction-fitted rather than riveted, and they are lighter than a Western handle, which moves the balance forward. Many shops will fit a handle to your hand, and some will engrave. Both are worth doing at the point of purchase.

The part people skip is the stone. Japanese knives are harder than most Western ones, which is why they hold an edge well and why a pull-through sharpener will wreck them. Buy a combination whetstone at the same time and ask for a demonstration — most shops will give you one — because a knife you cannot maintain becomes a blunt expensive object within a year.