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Smokintbird (Christopher) did that, Tom.
He's glad about additions, so if you have something to contribute to the chart, pm him.

According to that table they have their own grit size system.

Hi Benny! http://www.the-whisk.us/forum/images/smiles/wave.gif

The Naniwas are rather reasonably priced in the US actually.
When you take customs and shipping into account they are better at...

Well not really. The table I got this info from is the table from here, made by Christopher (Smokintbird)

Jim, why shave off a King 4000? Can you shave from a Norton 8000?

Actually the FEPA standard says that 75% of the particles are of that size.
The remaining 25% can be smaller or bigger.

Duh, reminds me to work on that table.

Norton 4000 = F800 or JIS(new) 2000
Norton 8000 = F1200 or JIS(new) 4000