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Naniwa Super Stone

Naniwa Super Stone

Item # IN-20

The Naniwa Super Stone has been updated. See the New Super Stone.


This page lists the last of the original Super Stones. The "New Super Stone" is here. The new version is twice as thick and has even better grit tolerances.

The Naniwa Super Stone is an exciting Japanese Waterstone for sharpening knives and tools. Like all waterstones, these stones require water but unlike traditional Japanese Waterstones, these don’t require soaking ahead of time. To use these stones, just apply a bit of water to the surface and you’re ready to sharpen.

Each stone measures 8 1/4" long, 2 3/4" wide and 3/8" thick. Each stone is bonded to a solid base. The base provides plenty of knuckle clearance when sharpening knives and is solidly built for sharpening tools.

These stones sharpen very quickly. With many of the modern steel alloys, speed of sharpening can be an important factor when considering a sharpening stone. These work well on tough tool steels such as A2 or D2 and very hard stainless alloys popular in Japanese and western cutlery.

We have been very impressed with the quality of these stones. Whether you're purchasing the very coarse 220 or all the way up to the extremely fine 12,000 grit, we’ve found these stones to be very consistently graded.

If you’ve considered purchasing a set of Japanese Waterstones we would certainly recommend the Naniwa Super Stones. Below we’ve described the grits in a little more detail to help you with your grit selections.

If you want to get down to the real details of this stone, this stone is made with a resin bond. This resin bond gives this stone two of its main features. First, the resin bond allows for a higher level of abrasive particles compared with less expensive methods of stone bonding. The higher abrasive levels contribute to the speed of sharpening. The second, these resin bonded stones don't require a soaking in water prior to use, just a sprinkle on the top is all that is needed.

Made in Japan.

Q. Is the Super Stone discontinued?

A. It has been replaced with the Naniwa Sharpening Stone. The line remains but the name changed.

Q. Do Naniwa Super Stones require flattening?

A. Over time, all waterstones require flattening. The bonding material of the stone will wear, providing fresh abrasive material. This is why waterstones sharpen so quickly. This is also why they need to be flattened periodically. Naniwa Flattening Stone.

Q. I notice that you don't have many Superstones left. Is it discontinued and it there a replacement.

A. Yes, Naniwa did replaced the Superstone with a new stone. The bases are no longer fixed to the stone so you can flip the stone and use both sides. The production process has been slightly altered to improve upon the already high particle standards set by Naniwa. As before, the new stone does not require soaking like. New Naniwa Superstones

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Phone US: 1-800-351-8234
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I recently placed my first order after finding you on the web while looking for grinding wheels. I am a customer for life. Here's why. My first order was a simple white grinding wheel for a "normal joe's shop". When I received the wrong wheel (150 grit instead of the ordered 100 grit) I called and without hesitation or the 3rd degree another wheel was sent off. No questioning of my integrity, intelligence or honor. Simply "I am sorry, we'll send the correct wheel off immediately..." The right thing was done by a neat guy. I was treated like an adult. Unbelievable in this day and age...proper...and priceless. Price, performance, responsiveness and customer service par excel-lance. 6-Stars! All my sharpening orders, albeit small shop orders, will now be with you. Promote you I will.
Greg T, Iowa