Sharpening Stone 320 Shapton RockStar
Code: SHA-WA60315Product detailed description
Fast restoration of a severely dull or damaged edge
A coarse synthetic sharpening stone made in Japan for edge repairs, rapid material removal and creating a new bevel before continuing with a finer grit.
Shapton RockStar JIS #320 is a coarse water sharpening stone intended for situations where a standard #1000 stone no longer works quickly enough. It helps restore a severely dull edge, remove minor chips and adjust the bevel geometry.
The JIS #320 grit corresponds to an abrasive particle size of approximately 40 microns. The stone therefore removes material considerably faster than basic or fine stones. It is also suitable for hard knife steels, but requires precise blade control and controlled pressure.
The dimensions of 210 × 70 × 10 mm provide a sufficiently large working surface for standard kitchen knives. After completing the repair, it is necessary to continue with at least a stone of approximately JIS #1000, which removes deeper sharpening marks and creates a usable working edge.
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When should you choose the Shapton RockStar #320?
| Severely dull edge The coarse grit quickly creates a new cutting edge where sharpening on a #1000 stone would take unnecessarily long. |
| Minor chips The stone helps remove small defects in the cutting edge and prepares it for subsequent, more precise sharpening. |
| Adjusting the bevel geometry The high sharpening power makes it possible to change the sharpening angle more quickly, restore the bevel or thin the area immediately behind the edge. |
| First step in the sharpening progression After the #320 stone, continue with #1000 grit and then, depending on the desired result, with #3000 or #6000. |
The #320 stone is not intended for final finishing
The coarse grit leaves more pronounced sharpening marks on the bevel. After repairing the edge, always continue with a finer stone. For standard kitchen use, we recommend at least JIS #1000 as the next step.
Technical specifications
| Parameter | Value |
|---|---|
| Brand | SHAPTON |
| Product range | Shapton RockStar |
| Type | Coarse synthetic water sharpening stone |
| Grit | JIS #320 |
| Abrasive particle size | Approximately 40 microns |
| Dimensions | 210 × 70 × 10 mm |
| Weight | 0.15 kg |
| Country of manufacture | Japan |
| Product code | SHA-WA60315 |
| EAN | 4944509603156 |
What can be repaired on the #320 stone?
- severely dull kitchen knives,
- minor chips and irregularities in the cutting edge,
- a worn or uneven bevel,
- an incorrectly formed sharpening angle,
- a thick area of the blade immediately behind the edge,
- selected woodworking and gardening tools.
The extent of the repair always depends on the specific damage and the construction of the knife. For deep chips, a broken tip or a significantly deformed blade, we recommend considering professional sharpening.
A coarse stone removes material very quickly
Check the progress of the repair frequently. Sharpening for too long or applying excessive pressure may remove more material than necessary and unnecessarily alter the original blade geometry.
Recommended sharpening progression
| Step | Grit | Purpose |
|---|---|---|
| 1. Repair | #320 | Removing damage, rapidly creating the bevel and restoring the geometry |
| 2. Basic sharpening | #1000 | Removing deeper marks and creating a working edge |
| 3. Refining | #3000 | Smoothing the bevel and providing a finer finish to the cutting edge |
| 4. Fine finish | #6000 | Optional very fine finish depending on the knife type and intended use |
How to use the stone correctly
- Place the stone on a stable non-slip mat or secure it in a holder.
- Wet the working surface with clean water.
- Mark the area of the edge to be repaired and select the desired sharpening angle in advance.
- Sharpen using controlled strokes and continuously check the amount of material being removed.
- After removing the damage, reduce the pressure and even out the bevel along the full length of the edge.
- Rinse both the knife and stone and continue with the finer #1000 grit.
Practical advice
When repairing a chip, do not sharpen only one small area. Even out the cutting edge smoothly over a longer section so that a hollow does not form in the blade and the natural edge profile is preserved.
Sharpening stone care
- Rinse the stone with clean water after sharpening.
- Do not use oil, aggressive cleaning agents or a dishwasher.
- Allow it to air-dry at room temperature.
- Do not dry it on a radiator or in direct sunlight.
- Do not store a damp stone in a closed container.
- Regularly check the flatness of the working surface.
Coarse stones may wear unevenly during intensive repairs. If a hollow develops in the centre, flatten the stone using a suitable diamond or flattening block. A flat working surface is important for creating an accurate bevel.
Safety and limitations
The stone is not intended for ceramic knives. Keep your fingers out of the path of the edge while sharpening, work on a stable surface and use only moderate pressure. Store both the stone and knives out of the reach of children.
Subsequent sharpening and additional equipment
| Shapton RockStar #1000 – required next step ›
Removes the deeper marks left by the #320 grit and creates a usable working edge. |
| View the complete Shapton RockStar range ›
Build a progression from coarse repair through basic sharpening to fine edge finishing. |
| Learn to sharpen on a Dellinger course ›
Gain confidence in repairing an edge and subsequently sharpening it on water stones. |
Not sure about the extent of the damage?
Contact us at +420 702 049 048, Monday to Friday between 7:30 and 16:00. We will help determine whether you can carry out the repair at home or whether professional sharpening would be more suitable.
Frequently asked questions
What is a JIS #320 sharpening stone used for?
It is used to quickly restore a severely dull edge, remove minor chips and adjust the bevel geometry.
Is the #320 stone suitable for standard regular sharpening?
Usually not. For regular maintenance of an ordinarily dull knife, a stone of approximately #1000 is more suitable. Use #320 grit for repairs and severe dullness.
Do I need to use a finer stone after the #320 stone?
Yes. After the repair, continue with at least a JIS #1000 stone, which removes deeper sharpening marks and creates a working edge.
Can chips be repaired on the stone?
Minor chips can be repaired. For deep damage, a broken tip or a deformed blade, we recommend professional assessment.
Is the stone suitable for hard Japanese knives?
Yes, it is also suitable for harder knife steels. Due to the rapid material removal, however, work accurately, carefully and with moderate pressure.
Does the stone need to be soaked for a long time before use?
No. Simply wet the working surface with clean water before sharpening and keep it wet during use.
Can ceramic knives be sharpened on the stone?
No. This sharpening stone is not intended for ceramic knives.
How do I know when I can move on to the #1000 stone?
Move on when the damage has been removed, the edge profile is smooth and the bevel has been formed evenly along the full length of the knife.
How often does the stone need to be flattened?
It depends on the intensity of use and the pressure applied. Check the flatness after major repairs and flatten the stone whenever a noticeable hollow appears on the surface.
How should the stone be stored correctly?
After rinsing, allow it to air-dry at room temperature. Store the stone in a dry place only when it is completely dry.
Additional parameters
| Category: | Shapton RockStar – Sharpening Stones |
|---|---|
| Warranty: | 2 years |
| Weight: | 0.15 kg |
| EAN: | 4944509603156 |
| production: | Japan |
SHAPTON – Japanese specialist in sharpening stones
SHAPTON Co., Ltd. is a Japanese manufacturer of synthetic sharpening stones and accessories for precise edge maintenance. The brand is known for fast abrasive action, a stable structure and a wide choice of grits for kitchen knives and craft tools.
SHAPTON is based in the town of Mashiko in Japan’s Tochigi Prefecture. The company focuses on developing sharpening stones that allow fast, controlled and highly repeatable edge work. Its products are used by professional sharpeners, chefs, craftspeople and home users who want to maintain their knives by hand.
SHAPTON sharpening stones feature a high concentration of abrasive particles and a carefully designed bonding system. This allows them to remove material efficiently, provide clear feedback during sharpening and wear more slowly than many softer stones. The wide grit range makes it possible to repair a damaged edge, create a new bevel, restore ordinary working sharpness and carry out extremely fine final polishing.
You can find the complete selection in the SHAPTON sharpening stones category.
Why are SHAPTON stones so popular?
Fast abrasive action
The high abrasive content makes it possible to restore the bevel effectively even on harder modern steels. With correct technique, there is therefore no need to apply heavy pressure to the blade.
No long soaking required
SHAPTON stones are designed for quick preparation. Before sharpening, the surface is usually only moistened with water, allowing you to start working without a long wait.
Lower wear
The optimised bonding system helps use the abrasive particles more efficiently. The stones therefore retain their working properties for a relatively long time, although their flatness still needs to be checked regularly.
Wide range of grits
From coarse repair stones to extremely fine polishing stones. Users can create a progressive sharpening sequence according to the condition of the knife, the steel used and the desired result.
Main SHAPTON sharpening-stone ranges
SHAPTON Kuromaku
Kuromaku is the classic range of solid synthetic sharpening stones. Individual grits are colour-coded, making it easier to distinguish between multiple stones while working. Each stone comes with a practical plastic case that can also be used as a base during sharpening.
SHAPTON GlassStone
The GlassStone range uses a thin abrasive layer firmly bonded to a glass base. The glass support provides dimensional stability and makes even a thin abrasive layer easier to handle. The extensive grit selection allows users to build a progression from basic sharpening to an exceptionally fine finish.
SHAPTON RockStar
RockStar is a modern premium range combining strong abrasive performance, a uniform structure and a finely controlled result. It is also designed for hard blades and users who want fast work without long soaking.
Which SHAPTON grit should you choose?
The brand or product range itself does not influence the result as much as choosing the correct grit. A coarse stone removes steel quickly, while a fine stone smooths the marks left by previous sharpening and refines the finished edge.
| Grit | Suitable use | Who it is suitable for |
|---|---|---|
| #120–#500 | Repairing a damaged edge, changing the bevel and working on a very dull knife. | More experienced users and repair sharpening. |
| #1000 | Restoring ordinary working sharpness and creating a new cutting edge. | The best first stone for most kitchen knives. |
| #1500–#3000 | Smoothing the bevel and providing a finer finish after basic sharpening. | Home cooks and more demanding users. |
| #4000–#8000 | Fine finishing and polishing of high-quality kitchen knives. | Japanese knives and blades requiring a smooth finish. |
| #12000–#16000 | Extremely fine specialised polishing after the previous stages. | Experienced sharpeners and specific edge-surface requirements. |
A simple recommendation for beginners
When buying your first sharpening stone, begin with #1000 grit. Add a #3000 stone for a finer finish. A coarse stone around #320 or #500 makes sense when the edge is damaged or significantly dull.
Maintaining SHAPTON sharpening stones
During sharpening, the working surface of every water stone gradually wears and may become hollow in the centre. An uneven stone makes it harder to control the angle and can result in an irregular bevel. It is therefore important to clean the surface continuously and flatten it when necessary.
- Moisten the stone before use according to the instructions for the specific range.
- Keep sufficient water on the surface while sharpening.
- Remove sharpening slurry and metal particles after use.
- Check the flatness of the working surface regularly.
- Allow the stone to dry naturally away from direct heat.
- Store the dry stone so that it cannot fall or suffer mechanical damage.
Holders, lapping tools, cleaning discs and other equipment can be found in the sharpening accessories category.
Would you like to learn how to sharpen correctly?
A high-quality sharpening stone is only part of the solution. Maintaining a stable angle, creating a burr, applying pressure correctly and progressing through the individual grits are equally important.
View the knife-sharpening course ›Frequently asked questions about SHAPTON
Where does the SHAPTON brand come from?
SHAPTON is a Japanese company based in the town of Mashiko in Tochigi Prefecture, Japan.
What makes SHAPTON sharpening stones special?
They stand out for their fast abrasive action, high abrasive content, good dimensional stability and wide choice of grits.
Do SHAPTON stones require long soaking?
Usually not. SHAPTON stones are designed for quick use after the surface has been moistened with water. Always follow the instructions for the specific product.
Which SHAPTON stone should I choose first?
For ordinary kitchen knives, #1000 is the most universal grit. It restores the working edge without removing material as aggressively as repair stones.
What is the difference between Kuromaku, GlassStone and RockStar?
Kuromaku stones are classic solid, colour-coded stones in a case. GlassStone uses an abrasive layer on a glass base. RockStar is a modern premium range with fast and even abrasive action.
Are SHAPTON stones suitable for hard Japanese steels?
Yes. A correctly selected SHAPTON stone can also be used on many hard Japanese steels. The appropriate grit, a stable angle and moderate pressure are decisive.
Can tools also be sharpened on SHAPTON stones?
Yes. Depending on the chosen range and grit, they can also be used to sharpen chisels, plane irons and other cutting tools.
Why does a sharpening stone need to be flattened?
The stone may wear unevenly during use. A flat surface improves angle control, blade contact and the consistency of the finished bevel.
Need help choosing?
We will help you select a suitable SHAPTON range and progressive grits according to the knife type, condition of the edge and your experience. Contact Dellinger on +420 702 049 048 on working days between 7:30–16:00.
| EU representative of the manufacturer : | Dellinger s.r.o. |
|---|---|
| Address of the EU representative : | Rižská 1580/7 102 00 Praha |
| Email of the EU representative : | saleseu@dellinger.cz |