Tsunesaburo Select Natural Koppa Sharpening Stone

$312.90

$312.90

$280.90

$280.90

$280.90

$187.90

$312.90

$249.90

$312.90

$156.90

$218.90

$280.90

$280.90

$405.90

$748.90

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WARNING

This product can potentially expose you to chemicals including lead, nickel and chromium which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warning.ca.gov

These stone were hand selected and tested at the quarry by Tsunesaburo, one of our favorite plane blade blacksmith.

Sizes are measured at longest part of the whole stone, not the actual flat surface.

General info given by Tsunesaburo

About Nakayama and Okudo natural stones

Among the natural stones available in Umegahata, Ukyo, Kyoto, these are the highest quality stones available. Sometimes called Tohmon or Higashimon, these are very tight, easier to get the slurry out, and are highly recommended for finishing your chisels and planes.

Simple Q and A

Q:Whats the grit of natural stone?
A:Unlike synthetic stones, natural stones do not have specific grits. Using the slurry containing sharpening particles, which breaks down even finer while sharpening, it's more like lapping using the slurry between the blade and the stone. While synthetic stones put an edge on tool according to their grit, natural stones will give sharper edge the more time you spend sharpening.

Q:Can these stones be soaked in water?
A:No, put some water on top and start sharpening. If you soak them you risk breaking them.

Q:How do you determine the hardness of stone?
A:Put a drop of water on surface and see how long it takes for the stone to suck the water. If the water remains for more than a minute its either a "hard" stone or "tight or condensed" stone. These two should not be confused. What you want is a tight stone.

Q:I sometimes get unlikely scratches on surface.
A:Harder stones are harder to get the slurry out, and while sharpening, the laminated soft iron can sometimes scratch the surface. To avoid this use the nagura to get the some slurry out before sharpening. If the stone stops releasing slurry while sharpening, you can also fix this by using nagura on it.

Q:How do you lap the stone?
A:Either 1000 grit diamond plate or #180 water proof sand paper on flat glass. Both needs water.

Q:So how do you tell which stone is good?
A:There are some differences between layers and mountains but basically, you will need to use it with your own blade and find out how long it takes to get "black" slurry out. Stones that releases black slurry within 10 seconds of sharpening is the one for your blade.

Q:Why do you prefer Koppa over cut rectangular stone?
A:Cut stones are simply much more expensive for same quality. You can acquire a high quality Koppa for less price and there are more higher quality Koppa out there. It will take a professional carpenter 3-5 years to use 5mm thickness of stone, so most Koppa will last you very long time.

Q:When do you use natural stones?
A:After #6000 to #8000 synthetic finisher.

Q:Will I get a free matching naruga stone?
A:Yes you will

Description of Each Stone

Stone#1
Nakayama Tomae
Slightly on harder side, but gives nice finish and easier to use.
1.8kg 23.5cm x 16.0cm x 4.3cm

Stone#2
Nakayama Tomae
Standard hardness, easier to use
1.0kg 27.0cm x 10.5cm x 2.5cm

Stone#3
Nakayama Tomae
Slightly on harder side, but gives nice finish and easier to use.
0.7kg 18.8cm x 8.0cm x 2.5cm

Stone#4
Nakayama Tomae
Very standard in terms of hardness.
0.7kg 18.6cm x 7.4cm x 2.1cm

Stone#5
Nakayama Tomae
Very standard in terms of hardness.
1.0kg 16.7cm x 7.9cm x 2.9cm

Stone#7
Nakayama Tomae
Very standard in terms of hardness.
0.9kg 15.1cm x 12.0cm x 3.1cm

Stone#9
Nakayama Tomae
On a soft side, much better on knives.
0.9kg 21.8cm x 11.8cm x 1.9cm

Stone#10
Okudo Tomae
Slightly on harder side, tight fine grits.
1.1kg 14.0cm x 7.9cm x 3.9cm

Stone#11
Okudo Tomae
Slightly on harder side, tight fine grits.
1.1kg 21.8cm x 10.2cm x 2.7cm

Stone#12
Okudo Tomae
Very easy to use, standard hardness.
0.8kg 17.2cm x 14.3cm x 2.9cm

Stone#13
Okudo Tomae
Slightly on harder side, tight fine grits.
0.9kg 21.7cm x 10.2cm x 2.7cm

Stone#15
Okudo Suita
Higher quality, some visible lines which seems like a crack but will have no problem using. If the diagonal line seems to catch then dig the corners with small screws.
1.3kg 21.8cm x 10.3cm x 4.4cm

Stone#16
Okudo Suita
Slightly on harder side, higher quality and tight grits.
1.2kg 16.5cm x 17.0cm x 3.3cm

Stone#19
Okudo Suita Renge
Highest quality of this batch, very easy to use.
0.8kg 16.0cm x 9.8cm x 2.2cm

Stone#20
Okudo Suita Ohban
Slightly on harder side, higher quality and efficiency.
2.1kg 31.5cm x 12.8cm x 3.5cm

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