The Grand Unified Grit Chart
Well, I've seen a lot of charts comparing various grit sizes in different systems out there, and at the behest of a friend on another forum, I've started somewhat of an ongoing project. None of this data is mine, it has been compiled from internet sources, and cross-checked where possible. If you spot an error, or have additional data that you would like added to the chart, let me know and I'll revise the tables and post up a new version.
The current chart compares the JIS, ANSI, FEPA-P, FEPA-F, EdgePro stones, Shapton Pro, and Chosera stones, and ranks them all to their particle micron size as best I am able to determine.