How to Choose the Right Grit for Your Japanese Kitchen Knife
A sharp knife is safer, more enjoyable to use, and makes cooking far more rewarding. But even the finest Japanese knife will eventually lose its edge without proper maintenance.
Among Japanese sharpening stones, Shapton Kuromaku has earned a reputation as one of the most trusted whetstone series in the world. Professional chefs, knife enthusiasts, and sharpeners appreciate its fast cutting performance, durability, and ease of use.
After more than 18 years working as a professional chef in Sydney, I've used many different sharpening stones. Today, Shapton Kuromaku is the stone I reach for most often. It sharpens quickly, stays flat longer than many traditional water stones, and delivers consistent results every time.
At Mikazuki Knives, we proudly stock the complete Shapton Kuromaku range, including #320, #1000, #5000 and #8000.
Throughout this guide you'll find recommendations on which grit to choose, along with links to each individual stone and our complete Shapton Whetstones Collection.
What is Shapton Kuromaku?
Shapton Kuromaku is a premium Japanese ceramic whetstone made in Japan by Shapton, one of the country's best-known sharpening stone manufacturers.
Compared with many traditional water stones, Kuromaku stones offer:
- Fast cutting performance
- Excellent wear resistance
- Longer-lasting flat surfaces
- Minimal soaking time
- Consistent sharpening results
Simply splash a little water on the surface and you're ready to sharpen.
Whether you're maintaining a home kitchen knife or sharpening professionally, Kuromaku stones are designed to make sharpening simple, efficient and enjoyable.
Why Chefs Around the World Choose Shapton
Professional kitchens move quickly.
There isn't time to spend half an hour restoring an edge before service.
That's one of the reasons Shapton Kuromaku has become so popular with chefs. It cuts efficiently, works beautifully on both stainless and carbon steels, and requires less maintenance than many softer whetstones.
Whether you're sharpening:
- VG10
- Aogami (Blue Steel)
- Shirogami (White Steel)
- Stainless steel
Kuromaku delivers reliable, repeatable results.
Five Reasons We Recommend Shapton Kuromaku
1. Fast Cutting Performance
Kuromaku stones remove steel efficiently, allowing you to restore a sharp edge in less time.
2. Splash and Go
Unlike many traditional whetstones, there's no need to soak the stone for an extended period. Simply add water and start sharpening.
3. Storage Case Doubles as a Stone Holder
Every Kuromaku stone comes with a sturdy storage case that also functions as a sharpening base.
There's no need to purchase a separate stone holder—simply place the stone in the case and start sharpening. The non-slip base keeps everything stable while you work.
4. Colour-Coded Design
One of my favourite features is the colour-coded design.
Each grit has its own distinctive colour, and both the stone and its storage case match that grit. When you own several stones, you can instantly recognise the one you need without checking the grit number.
It may seem like a small detail, but if you sharpen regularly, it's surprisingly convenient.
The vibrant colours also give the Kuromaku series a modern, organised look that makes sharpening just a little more enjoyable.
5. Long-Lasting and Easy to Maintain
Because Kuromaku stones are relatively hard, they wear more slowly than many softer whetstones.
That means less frequent flattening and more time spent sharpening.
Which Grit Should You Choose?
#320 – Repair & Edge Reset
Best for:
- Repairing chipped knives
- Reshaping damaged edges
- Heavy steel removal
This isn't a stone you'll use every week, but it's invaluable when a knife has been damaged.
View the Shapton Kuromaku #320
#1000 – The Essential Stone
If you're buying your first whetstone, choose the #1000.
It's perfect for:
- Regular sharpening
- Restoring a dull edge
- Routine knife maintenance
For most home cooks, this is the only stone needed to keep a knife performing well.
→ View the Shapton Kuromaku #1000
#5000 – My Favourite Maintenance Stone
Many people think a #5000 stone is only for polishing.
I use it differently.
When I notice my knife has lost just a little sharpness, I often reach for the #5000 before using the #1000.
The feeling is very similar to a chef using a honing rod before service.
Rather than removing a significant amount of steel, the #5000 gently refines the edge and restores much of the knife's cutting performance.
View the Shapton Kuromaku #5000
#8000 – Ultimate Finishing
For those chasing the finest possible edge.
Ideal for:
- Yanagiba
- Sashimi knives
- Premium Japanese knives
For everyday Gyutos and Santokus, finishing on the #5000 is already more than enough.
→ View the Shapton Kuromaku #8000
How I Personally Use Shapton Kuromaku
One of the most common questions I hear is:
"Should I sharpen on the #1000 every time?"
My answer is usually no.
If my knife has simply lost a little bite, I don't immediately reach for the #1000.
Instead, I first spend a few minutes on the #5000.
I think of it the same way a chef uses a honing rod—not to create a completely new edge, but to refresh the one that's already there.
I'll usually repeat this maintenance routine two or three times.
Only when the knife no longer responds do I return to the #1000 to rebuild the edge properly.
My routine looks like this:
- Slight drop in sharpness → #5000
- Repeat this maintenance 2–3 times
- Edge no longer responds → #1000
- Chipped knife → #320 → #1000 → #5000
Using this approach removes less steel over time and helps extend the life of the knife.
Recommended Combinations
New to sharpening?
Our Most Recommended Combination
This is the combination I recommend most often.
Use the #1000 to establish a sharp edge, then use the #5000 for regular maintenance whenever the knife starts to lose a little performance.
Repair Kit
Perfect for repairing chipped or heavily worn knives.
Complete Professional Set
Everything you need for complete knife maintenance.
Frequently Asked Questions
Do I need to soak Shapton Kuromaku?
No.
Simply splash water on the surface before sharpening.
Does it need flattening?
Like every whetstone, it will eventually wear.
However, Kuromaku stones wear much more slowly than many softer stones, meaning less frequent flattening.
Which grit should I buy first?
If you're unsure, start with the #1000.
If you sharpen regularly, adding the #5000 is one of the best upgrades you can make.
Final Thoughts
Shapton Kuromaku has earned its reputation for good reason.
It's fast, durable, easy to use, and suitable for everyone—from home cooks sharpening their first Japanese knife to professional chefs maintaining high-performance blades every day.
If I could recommend just one combination, it would be the #1000 and #5000.
The #1000 creates the edge.
The #5000 helps maintain it.
Used together, they keep your knives performing at their best while removing less steel over the lifetime of the blade.
Explore the Shapton Kuromaku Collection
Ready to improve your sharpening routine?
Browse our complete range of Shapton Kuromaku whetstones, including the #320, #1000, #5000 and #8000, or explore our complete Shapton Whetstones Collection to find the right combination for your kitchen. Thank you for reading.
Explore the Shapton Kuromaku Collection