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I see what you mean....

Like I said earlier, almost all manufacturers have different ways of measuring things, but in Norton's case I think it is bad information:

The Old Japanese Industrial...

Actually Khaos, Norton claims their stones are "8000 Grit" not "JIS8000 grit"...

Like I said before almost every manufacturer has a slightly skewed grit rating system. The most you can hope for...

BTW, here's my most recent list...

Let me know if anyone finds any discrepancies or anything they would like to have added!

Right there you hit the nail on the head about the Grit rating systems.....

:soapbox:
I have spent an awfully long time compiling and recompiling a grit comparison list, there is precious little...