Most Japanese knives are designed with fine edge geometries and should be sharpened at 10 to 15 degrees per side (or a 20°–30° inclusive angle). Because Japanese steel is typically harder (60+ HRC) than Western steel, it supports a much thinner, razor-sharp edge without rolling.
For traditional Japanese knives, you should use a 15-degree angle per side. This creates an incredibly sharp, thin, and precise edge designed for slicing and push-cutting. Western-style (European/German) knives use a 20-degree angle per side for more durability.
The correct sharpening angle for the blade edge of the best Japanese knives is 10 - 15 degrees on one single side. On a one sided blade, or single bevel the angle would therefore be 10 - 15 degrees in total.
The best way to tell is by asking the manufacturer of the knife. As a general guide, European/American knives manufactured before 2010 have 20 degree edges while Asian style knives have 15 degree edges. However, there are exceptions to this rule of thumb.
If the blade has become blunt or developed nicks, first form a rough shape using the rough whetstone, and then sharpen using a medium whetstone following by a finishing whetstone. Start by placing the reverse side of the blade flatly on the medium whetstone and sharpen several times.
Compared to many Western knives, Japanese blades often use harder steels (such as White steel, Blue steel, Ginsan, VG10, SG2, and others). Harder steel holds an edge longer but also demands more precision when sharpening. The wrong technique—or the wrong tools—can: Chip or roll the edge.
Cutting boards made of glass, granite, ceramic, or your dinner plate may look stylish or convenient, but they are the fastest way to destroy a knife's edge. These surfaces are harder than your knife's steel. So every time your blade contacts them, it suffers microscopic edge deformation, chipping, or even rolling.
In the sharpening phase, we do not recommend any current WD-40® Brand Products although some may be used later for storage & protection. For sharpening stones the lubrication can come from water or oil.
The sharpest practical knife angle for everyday tasks is 10° to 15° per side. Lower angles create thinner, razor-like edges, but they are more fragile and prone to chipping. The ideal angle depends on the type of knife and what you are cutting.
In general, Japanese knives are made from a harder type of steel than European knives. While the hardness of the steel of a European knife is often between 54 and 58 Rockwell, the Japanese knives often start at 58 Rockwell up to 66 Rockwell. Please note: the harder the steel, the more vulnerable the blade.
What should NOT be cut with a Japanese knife?
Single bevel knives are favored in specific types of cooking, such as Japanese, as they offer a key advantage – they are extremely sharp. This is due to the fact they only need to be honed on one side so it is easier to create a much smaller, thus sharper, angle.
Victorinox recommends sharpening your Swiss Army Knife at 15-20 degrees per side. If you're going to be using your pocket knife for delicate slicing tasks, like cutting fruit or slicing open envelopes, then pick an angle closer to 15 degrees.
What You Should Know About the Global G-2 Chef's Knife. Global is most well-known for its handcrafted Japanese knives, though the brand also makes knife sharpeners and tools for the kitchen. Anthony Bourdain was a fan of the brand's G-2 Chef's Knife in particular, especially for those just getting into cooking.
The ideal sharpening angle for a butcher knife is 15∘15 raised to the composed with power𝟏𝟓∘ to 20∘20 raised to the composed with power𝟐𝟎∘ per side (creating an overall edge angle of 30∘30 raised to the composed with power30∘ to 40∘40 raised to the composed with power40∘). This range provides a balance of razor-sharp slicing performance and edge durability.
The sharpest knife in the world is made from obsidian (volcanic glass). Because it fractures at the molecular level, its edge can be as thin as 3 nanometers. This makes it up to 500 times sharper than a standard surgical steel scalpel.
We tend to grind to 13-16 degrees per side. If you match the existing edge angle and hold the knife against the stone to cut evenly across the edge grind, you will produce an edge with a similar angle.
Butterfly knives (or balisongs) are illegal in many areas because they are categorized as dangerous, easily concealed weapons that can be deployed rapidly with one hand. Lawmakers often associate their flashy nature with gang activity, intimidation tactics, and pop-culture violence.
Navy SEALs rely on a few specific standard-issue fixed blades, but they largely carry mission-dependent gear. Standard-issue knives include the Ontario MK3 Mod 0 dive knife and the Cold Steel SRK. For everyday carry and field operations, operators frequently choose rugged folding knives from premium brands.
In the high-end folding knife community, the original "Holy Trinity" refers to three legendary American makers who pioneered the modern premium tactical folder. Together, their designs set the gold standard for durability and precision.
If you have one chef's knife, one paring knife, and one bread knife, consider yourself equipped with thetop three knives every kitchen needs. Now it's time to find something good to cook!
Rule #1: It is important to use a knife adapted to what you want to do / food you want to prepare. For example, you shouldn't use a bread knife to slice a roast or use the blade of a paring knife and use it as a screwdriver (don't laugh, we've all done it!) Rule #2: Don't drop your knife on the floor.