Are Japanese Knives Hard to Sharpen? An Honest Guide (UK 2026)

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Updated August 2026 · 8 min read · UK Japanese-steel knife specialists

It's the worry that stops a lot of people buying their first proper knife: "if the steel is that hard, isn't it going to be a nightmare to sharpen?" It's a fair question, and the short answer is a reassuring one — no, not really. For most home cooks a hard, thin Japanese-steel blade is actually easier to bring to a keen edge than a soft Western knife, and it holds that edge for far longer.

The catch is small and worth being honest about. Hard VG10 or AUS-10 steel doesn't get on with cheap pull-through and electric sharpeners — the very gadgets many people assume make sharpening "easy". Give it the right tool instead — a whetstone — and there's just a short knack to learn: holding the blade at a shallow, steady angle. That's the whole of the "hard" part, and it takes an afternoon to get comfortable with.

Below we clear up where the "hard to sharpen" myth comes from, what actually makes any knife easy or hard to sharpen, a simple whetstone routine anyone can follow, how often you really need to bother, and the few tools that make the whole thing effortless.

Why people think Japanese knives are hard to sharpen

The myth comes from a single word: hardness. Japanese-steel knives are made from high-carbon stainless steels — VG10 at roughly 60–61 HRC, AUS-10 around 58–61 HRC — hardened noticeably beyond the ~56–58 HRC of a typical German or French knife. "Harder steel" sounds like it should mean "harder to grind", and in a very narrow, technical sense it does: a harder steel takes a little more work to remove metal from.

But that reasoning quietly skips the part that matters for actually getting a knife sharp. A keen edge is formed at the very apex of the blade, and on a hard, thin Japanese-steel knife that apex is fine and well-supported. On a whetstone it comes to a crisp, lasting edge quickly. The hardness that supposedly makes it "difficult" is exactly what lets it take — and keep — a sharper edge than a softer blade ever could.

Where the reputation really comes from is technique and tools. A hard blade is less forgiving of a sloppy angle or an aggressive gadget than a soft one that just bends back into rough shape. So the honest truth isn't "hard to sharpen" — it's "rewards doing it properly, and punishes doing it badly". Once you know the right way, that distinction disappears.

What actually makes a knife easy or hard to sharpen

Three things decide how easy sharpening feels, and steel hardness is barely one of them.

The tool you use. This is the big one. A flat whetstone lets you set your own angle and work the actual edge — it's the right match for any good knife, and especially for hard, thin Japanese steel. A cheap pull-through or carbide sharpener drags the edge through a fixed V at a preset angle (usually around 20°, far steeper than these knives want), tears out metal rather than refining it, and can chip a fine hard edge. The knife isn't hard to sharpen; the wrong tool just makes it feel that way.

The angle. Japanese-steel knives are double-bevel blades ground thin behind an edge of roughly 15° per side (about 30° inclusive) — flatter than the ~20° per side of a typical Western knife. Hold that shallow, consistent angle on a stone and the edge comes up easily. The only real skill is keeping it steady, and that's a knack, not a talent.

Edge retention. Because the steel is hard, the edge lasts. A blade that holds its edge for months is one you rarely have to sharpen at all — which, in day-to-day terms, makes it far less effort to keep sharp than a soft knife that dulls in a fortnight. Between proper sharpenings, a quick pass on a honing or diamond steel realigns the edge and keeps it biting.

Put those together and the picture flips. The "hard" knife is the low-maintenance one — provided you reach for a stone and a honing rod rather than a supermarket gadget. If you want the background on why any edge dulls in the first place, we cover it in why kitchen knives go blunt.

A simple whetstone routine

Here's the whole thing, start to finish. It's less fiddly than it looks written down, and after a couple of goes it takes ten quiet minutes.

1. Soak the stone. Sit a water stone in water for five to ten minutes until the bubbles stop. Set it on a damp cloth or holder so it can't slide.

2. Start coarse. If the knife is properly dull, begin on the coarse side (around 400 grit). For a routine tune-up, start at a medium grit (1000). Lay the blade on the stone and tip it up to about 15° — roughly two stacked pound coins under the spine is a good visual.

3. Raise a burr. Draw the edge along the stone with light, even strokes, working from heel to tip, until you can feel a faint burr on the opposite side of the edge. Then repeat on the other side to match it.

4. Refine. Move up through the grits (1000 then 3000, finishing on 8000 for a polished edge), doing fewer strokes at each stage and keeping the pressure light. Higher grits remove the burr and leave a cleaner, keener apex.

5. Finish with a light strop. A few gentle trailing passes on the finest stone (or a strop) knocks off the last of the burr. Rinse, dry, and you're done.

That's genuinely all there is to it. If you'd like it broken down step by step with more detail, follow our full guide on how to sharpen a knife on a whetstone, and if you're not sure which grits to buy, see what grade of whetstone to buy.

Honing vs sharpening — they're not the same job

People use the words interchangeably, but they do different things, and understanding the difference is what makes upkeep feel effortless.

Honing realigns an edge that's rolled slightly out of true through normal use. A fine diamond or smooth steel, used with light pressure and the same ~15° angle, straightens the very apex so the knife bites keenly again. It removes almost no metal — it just tidies what's already there, and it takes seconds.

Sharpening — on a whetstone — actually grinds a fresh edge when honing no longer restores the bite. It removes a little metal to form a new apex. You hone often and sharpen rarely; the two work together. We lay out exactly when to use each in whetstone vs honing steel.

How often do you actually need to sharpen?

Less often than you're probably expecting, and less often than a softer knife. Because hard VG10 and AUS-10 hold their edge so well, a knife in normal home use will usually go months between whetstone sharpenings — not weeks.

A realistic rhythm for most kitchens: a quick hone on a steel once a week or so to keep the edge aligned, and a proper sharpen on a whetstone every few months, or whenever honing stops bringing the bite back. That really is the entire maintenance commitment. We go into the timings in more detail in how often you should sharpen a Japanese knife.

Common mistakes that make it harder than it needs to be

Reaching for a pull-through or electric sharpener. The single biggest cause of grief. Their fixed, steep angle and coarse abrasives are wrong for a thin, hard edge and can chip it — the very thing people then blame on the knife being "hard to sharpen". We explain why in are electric knife sharpeners bad.

Using the wrong angle. Sharpen at a Western ~20°+ and you're fighting the blade's geometry. Keep to roughly 15° per side and the edge comes up easily and lasts.

Heavy pressure. Hard steel doesn't need force. Light, consistent strokes do the work; leaning on the blade just risks a rough edge or a chip.

The dishwasher. Heat, harsh detergent and knocks against other items dull and damage an edge fast. Hand-wash and dry, every time.

Cutting on glass, stone or ceramic boards. These hard surfaces blunt an edge with every stroke. Stick to wood or good plastic and your knife stays sharp far longer — more on what causes dulling in why kitchen knives go blunt.

The tools that make sharpening easy

Get the right kit and "hard to sharpen" never comes up. A whetstone to sharpen, a steel to hone between times, and a knife whose hard steel holds its edge in the first place — here are the ones we'd point you to.

Sharpening kit at a glance

Item	Price	Rating	Best for
Whetstone 400/1000 3000/8000 — essential	£59.99	4.86 (118)	The one tool that actually sharpens
Haruta 13" Diamond Steel	£54.99	4.87 (111)	Quick honing between sharpenings
Chikashi 13" Sharpening Steel	£59.99	4.90 (145)	Premium honing option
Aiko Black Damascus VG10	from £64.99	4.94 (120)	Holds an edge; sharpen less often
Riku Damascus VG10	from £49.99	4.89 (62)	Easy-to-keep-sharp on a budget

Frequently asked questions

Are Japanese knives harder to sharpen than German knives?

Not really. Harder steel takes a keen edge quickly on a whetstone and holds it far longer, so you sharpen less often. It's simply less forgiving of a bad angle or a cheap gadget than a soft German blade — that's the only real difference, and good technique removes it.

Do I need a whetstone, or can I use a pull-through sharpener?

Use a whetstone. Cheap pull-through and carbide sharpeners are a poor match for hard, thin VG10 or AUS-10 — they work at the wrong angle, remove too much metal and can chip the edge. A whetstone lets you set the right 15° angle and refine the edge properly.

What angle do I sharpen a Japanese knife at?

About 15° per side, or roughly 30° inclusive — flatter than the typical Western ~20° per side. These are double-bevel blades, so you sharpen both sides evenly at that shallow angle.

How often do Japanese knives need sharpening?

Less often than softer knives, because the hard steel holds its edge well. In normal home use, hone the edge weekly with a steel and sharpen on a whetstone every few months — or whenever honing no longer restores the bite.

Can I use a honing/diamond steel on a Japanese knife?

Yes. A fine diamond or smooth steel realigns the edge with light pressure at around 15°, keeping the knife sharp between sharpenings. It maintains the edge but doesn't grind a new one, so it doesn't replace occasional whetstone sharpening.

Will a hard Japanese blade chip if I sharpen it wrong?

It can if you use a coarse pull-through sharpener or a steep angle with heavy pressure. On a whetstone at around 15° per side with light, even strokes it won't — that's exactly how these blades are meant to be sharpened.

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