Most kitchen knives sold in the US are double bevel. They are sharpened on both sides so the edge sits in the middle of the blade. Traditional Japanese kitchens also use a family of single-bevel knives, sharpened on one side only, that grew out of Japanese fish and vegetable cookery. Sakai in Osaka is the historic center of single-bevel knife making, and the knives from there are some of the most refined tools you can buy.
They are also easy to buy for the wrong reasons. Here is how the two edges differ, what each is for, and who genuinely needs a single-bevel knife.
The geometry
Double bevel
A double-bevel knife is ground on both faces. Looking down the edge from the tip, you see a V. The V may be symmetrical (50/50) or slightly biased to one side (60/40 or 70/30 on some Japanese knives), but both sides carry a bevel. Almost every gyuto, santoku, nakiri, petty, and bunka is double bevel.
A Japanese double-bevel edge is typically sharpened at around 10 to 15 degrees per side, which is noticeably more acute than the roughly 17 to 20 degrees common on German knives. See Japanese vs German knives for more on that difference.
Single bevel
A single-bevel knife has one face ground at an angle, called the omote (front), and the other face almost flat, called the ura (back). Looking down the edge, it looks like a chisel. All of the edge angle sits on one side.
Single-bevel knives are usually built as a hard steel edge layer forge welded to a soft iron body, called kasumi construction on traditional knives, or made fully of one steel (honyaki) at the top end. The hard steel sits on the ura side, so the edge is hard while the body stays tough and easy to grind.
Ura and urasuki
The ura is not dead flat. It is ground slightly hollow in the center, a feature called urasuki. Only a narrow rim around the edge and spine (the ura oshi, the flat band) touches the stone.
The hollow does two things. It makes the back far easier to keep flat when sharpening, since you are only working a thin band rather than the whole face. It also reduces contact with food, which helps slices of fish fall away cleanly. Keeping that ura band thin and even over years of sharpening is one of the real skills of owning a single-bevel knife.
How each edge cuts
A double-bevel knife cuts in a straight line. The two faces push food apart evenly, so the knife travels where you aim it. That is what you want for dicing, chopping, and general prep.
A single-bevel knife wants to steer. The flat side stays against the food while the beveled side pushes the cut piece away, so the blade tends to drift toward the beveled side. Skilled cooks use that on purpose. With a yanagiba, the flat back rides along the fish block and leaves a smooth, glossy slice. With an usuba, the flat back makes paper-thin katsuramuki sheets of daikon possible. With a deba, the geometry follows along fish bones as you fillet.
Used for general chopping, that same steering makes cuts wander and wedges food apart. That is why single-bevel knives feel strange to most people at first.
Right and left hand
Double-bevel knives work for either hand. Even an asymmetric 70/30 grind is usable by lefties, and a sharpener can rebalance it.
Single-bevel knives are made for one hand. A standard yanagiba, deba, or usuba is right-handed, with the bevel on the right face as you hold it. Left-handed versions are a mirror image and need to be ordered as such. They are made in smaller numbers, so they often cost more and can take longer to source. If you are left-handed and want a single-bevel knife, tell the seller up front, and do not accept a right-handed knife as a substitute.
What each type is used for
| Knife | Bevel | Main job |
|---|---|---|
| Gyuto | Double | All-purpose chef’s knife |
| Santoku | Double | All-purpose, shorter |
| Nakiri | Double | Vegetables |
| Bunka | Double | All-purpose, tip work |
| Petty | Double | Small tasks, fruit, trimming |
| Sujihiki | Double | Slicing meat and fish |
| Honesuki | Asymmetric or single | Poultry breakdown |
| Yanagiba | Single | Slicing sashimi |
| Deba | Single | Filleting and breaking down fish |
| Usuba | Single | Precision vegetable work |
| Kiritsuke | Single (traditional) or double (gyuto style) | Slicing and vegetables |
A note on kiritsuke: the traditional kiritsuke is single bevel and a hard knife to master. Many “kiritsuke” sold abroad are really double-bevel gyuto with an angled tip. Check the listing before buying. Our Japanese knife types guide covers every shape in more detail.
Sharpening difficulty
Sharpening a double-bevel Japanese knife takes a 1000 grit stone and practice holding a consistent angle on each side. Most home cooks get competent in a few sessions. Our whetstone guide walks through it.
Sharpening a single-bevel knife is a different skill:
- The omote bevel is wide and has to be laid flat on the stone, with the edge and shoulder both in contact. Rocking it rounds the bevel.
- The ura is only touched lightly, just enough to remove the burr, because each pass thins the ura oshi band. Grinding the back too much ruins the urasuki over time.
- The knife needs to be kept flat along its whole length, which means stones need to be flattened often.
- Traditional single-bevel knives are commonly carbon steel like Shirogami 2, which sharpens beautifully but needs to be dried promptly.
None of this is mysterious, but it takes time to learn, and mistakes are harder to undo than on a double-bevel knife.
Who actually needs a single-bevel knife
You will get real value from a single-bevel knife if:
- You break down whole fish regularly. A deba is the right tool, and the Sakai Takayuki Shirogami deba is a classic Sakai example.
- You slice sashimi or crudo often and want glass-smooth cut faces. A yanagiba like the Sakai Takayuki Ginsan yanagiba 270 does that better than anything else. Ginsan is stainless, which makes it a sensible first yanagiba.
- You cook Japanese cuisine professionally, or you are training toward it.
- You enjoy sharpening and want a knife that rewards that care.
You probably do not need one if:
- You are buying your first Japanese knife. Start double bevel. See best Japanese knife for beginners.
- You mostly cook Western food, stir fries, and everyday vegetables.
- You want one knife that does everything. A double-bevel gyuto such as the Tojiro DP gyuto will serve you far better.
For vegetables specifically, a double-bevel nakiri like the Tojiro Shirogami kurouchi nakiri gives most of the usuba experience without the steering or the sharpening learning curve.
Single bevel vs double bevel at a glance
| Single bevel | Double bevel | |
|---|---|---|
| Edge shape | Chisel, one side ground | V, both sides ground |
| Back side | Hollow ura with flat rim | Beveled like the front |
| Cutting path | Steers toward the bevel | Straight |
| Handedness | Right or left specific | Either hand |
| Best at | Fish, sashimi, precision vegetables | Everything else |
| Sharpening | Specialized, slower to learn | Standard technique |
| Typical construction | Hard steel forge welded to soft iron | Stainless or clad, sometimes mono steel |
| Good first knife | Rarely | Yes |
Buying single-bevel knives from Japan
Single-bevel knives are where buying from Japan matters most. The best are made in Sakai through a division of labor between smiths, sharpeners, and handle makers, and many are hard to find in the US at all, especially in left-handed versions. Our Japanese knife making regions guide explains how that system works. We ship with import duties prepaid, so the price you see is what you pay on delivery.
If you are weighing a deba or yanagiba against a double-bevel knife, tell us what you cook and we will help you decide, including sourcing a left-handed version if you need one.
Frequently asked questions
Can a left-handed person use a single-bevel knife?
Only a left-handed version. Single-bevel knives are ground for one hand, and a right-handed yanagiba will steer badly in the left hand. Left-handed versions exist but are made in smaller numbers and often cost more and take longer to source.
Is a single-bevel knife sharper?
It can take a more acute edge because all the angle is on one side, and it leaves a very clean cut surface on fish. For general kitchen work, a well sharpened double-bevel knife is just as effective and much easier to use.
What is the ura on a Japanese knife?
The ura is the flat back side of a single-bevel knife. It is slightly hollow ground, called urasuki, so only a thin rim touches the stone, which makes it easier to flatten and helps food release.
Do I need a single-bevel knife for sushi at home?
No. A sharp gyuto or sujihiki slices sashimi well. A yanagiba is a pleasure if you cut fish often, but it is not required.