Japanese Waterstones: NANIWA PROFESSIONAL STONE / CHOSERA

Japanese Waterstones: NANIWA PROFESSIONAL STONE / CHOSERA

With its "PROFESSIONAL STONE" (new) / "CHOSERA" (old) brands Naniwa offers a high-tech line of sharpening stones. The Professional Stones are markedly harder than the Sharpening Stones from the same manufacturer. Naniwa designed these stones for professional woodworkers and carvers, who put the highest daily demands on their tools. Overall, these stones are best for those who don't have a lot of time to spend and need to quickly and cleanly sharpen their tools.

Professional Stones / Chosera stones are harder than the Naniwa Professional Stones and so take much longer to develop a hollow in use. These stones also cut faster, especially in the rougher stones -- 3000 grit and larger. The 400-grit Professional Stone, for instance, works faster than the 220-grit Sharpening Stone, and is only marginally slower than the Shapton 120-grit. Normally the Professional Stones only need to have their surfaces moistened a bit with water.

A flat stone is vital to a good sharpening job and flattening stones takes time. Have a look at the flattening blocks and supplies we offer.

A note on the packaging of the Chosera stones: The box is marked "with Stand", that is to say with a holder glued to the back of the stone. Normally these stones are delivered with a plastic holder. But we prefer, and most users of these stones agree, not to have a holder glued to the back of the stone because if one finds that the stone needs flattening in the middle of a job, one can simply flip the stone over to use the other side without interrupting work and then flatten the stone at one's leisure. So we asked Naniwa to deliver the stones without the holder, despite what the packaging says.

IMPORTANT NOTE on storage and lubrication: Professional Stones / Chosera sharpening stones are bound with magnesium and so have more cutting particles per unit of surface than resin-bound stones. But magnesium-bound stones are much more sensitive to prolonged exposure to water as other types of stones. So Professional Stones / Chosera stones should NOT be left to soak in water for prolonged periods and must be stored dry. If this advice is not followed the stones can develop hairline cracks or the binding material can be leached out of the stone. It is more than enough to pour a little water on the surface or briefly dip the stones in water, they do not need to be soaked. If you are not sure that you can keep this always in mind, perhaps because you have a number of different kinds of sharpening stones, it may be better to opt for the more tolerant Sharpening Stones.

Every Chosera sharpening stone is delivered with a special Nagura stone (67 x 49 x 25 mm) to put a fine sharpening paste on the surface of the Chosera stones during use.
View packing
View all Chosera Stones

Note on the Naniwa Name Change: The line Chosera is now Professional Stone. Besides the name change, the packaging has changed as well to a size that fits the stones better. Further the thickness of the stones changed from 25mm to 20mm and the Nagura stone is no longer included. We will be phasing out the Chosera over time and replacing them with Professional Stones. Both the old and new stones will be sold parallel as long as available. As the Professional Stones line is more expensive then its predecessor, purchasing the Chosera while they are still in stock is the better choice.

Coarse Sharpening Stone Grain Size 400
Coarse Sharpening Stone Grain Size 400
Professional Stone Series
for extremly dull blades, grinding down notches,
and restoring blades
Size: 210 mm x 70 mm x 20 mm
Order nr. 313320 In den Warenkorb
Price € 54.00
Chosera Grain Size 600
Sharpening Stone Grain Size 600
Chosera Series
for dull blades and fast remove of material
Size: 210 mm x 70 mm x 25 mm
Order nr. 313291 cart
Price € 49.00
Chosera Grain Size 800
Sharpening Stone Grain Size 800
Chosera Series
for fast sharpening
Size: 210 mm x 70 mm x 25 mm
Order nr. 313292 cart
Price € 54.00
Professional Stone Series: Coarse Sharpening Stone Grain Size 800
Sharpening Stone Grain Size 800
Professional Stone Series
for fast sharpening
Size: 210 mm x 70 mm x 20 mm
Order nr. 313322 In den Warenkorb
Price € 62.00
Chosera Grain Size 1000
Sharpening Stone Grain Size 1000
Chosera Series
for fast and fine sharpening
Size: 210 mm x 70 mm x 25 mm
Order nr. 313293 cart
Price € 59.00
Chosera Grain Size 2000
Sharpening Stone Grain Size 2000
Chosera Series
for fine sharpening
Size: 210 mm x 70 mm x 25 mm
Order nr. 313294 cart
Price € 67.00
Professional Stone Series: Sharpening Stone Grain Size 2000
Sharpening Stone Grain Size 2000
Professional Stone Series
for fine sharpening
Size: 210 mm x 70 mm x 20 mm
Order nr. 313324 In den Warenkorb
Price € 72.00
Chosera Grain Size 3000
Honing Stone Grain Size 3000
Chosera Series
for removing the burr after sharpening
or step between 2000 and 5000
Size: 210 mm x 70 mm x 25 mm
Order nr. 313295 cart
Price € 89.00
Chosera Grain Size 5000
Honing Stone Grain Size 5000
Chosera Series
for removing the burr after sharpening
or step between 3000 and 10000
fine honing
Size: 210 mm x 70 mm x 25 mm
Order nr. 313296 cart
Price € 115.00
Chosera Grain Size 10000
Honing Stone Grain Size 10000
Chosera Series
for removing the burr after sharpening
also for finest honing after the 5000 grit stone
to achieve a high polished blade
Notice: this 10000 grit stone is 5 mm thicker than the other Chosera stones.
Size: 210 mm x 70 mm x 30 mm
Order nr. 313298 cart
Price € 229.00
Artificial Nagura Stone
Artificial Nagura Stone
The Nagura stone coming with the Chosera stones is available separately. With a Nagura stone you can put a fine sharpening paste on the surface of waterstones. Can be used on other waterstones too.
Size: 65 mm x 47 mm x 32 mm
Order nr. 313220 In den Warenkorb
Price € 6.90
 
Dieter Schmid - Fine Tools
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