People keep asking about how the grit sizes of stones compare so, I thought I'd start a link/info page. Post links, comparisons, stone/sharpener reviews.
Japanese waterstones use JIS (Japanese Industrial Standard) for grading abrasives.
is a chart showing the grit number and the average particle size in microns (millionths of a meter... for comparison the wavelength of red light is about 0.7 microns and blue light is about 0.4 microns). It also gives the range and error margins... i.e. a 1000 grit stone is 11.5 microns with a 1 micron error so half the particles fall between 10.5 and 12.5 microns. The rest of the numbers specify that only 3% of the particles can be bigger than 27 microns or smaller than 7 microns, and no single particle can be bigger than 32 microns or the batch can be rejected, though most Japanese manufacturers have tighter controls than the standards allow for). If I remember correctly the Shapton cream stone is 0.96 microns and their purple stone (30,000 grit) is about 0.4 microns. Generally you can guess the micron size pretty close by dividing 12500 by the JIS grit.
Here is a chart for DMT diamond plates DMT color code
A grit chart for diamond dust/paste diamond polish
A grit chart for Micro-mesh polishing papers micromesh
A comparison of different grit standards comparison chart
(note, the sizes for JIS grits in this table are based on the old sedimentation tube method of measuring and are larger than the ones in my table)
A catch-all chart showing a little bit of everything A comparison of grit sizes of belts, wheels, stones and hones used in knifemaking, sharpening and woodworking.
Cbwx34's handy little comparison chart http://www.knifeforums.com/uploads/1136390328-ShrpnrCmpre4.JPG
A chart for Arkansas stones Dan's whetstones
Quietone's US / JIS grit chart http://www.knifeforums.com/uploads/1136458983-GritMicronJIS.gif
The grit sizes for Norton's India, Crystalon and waterstones are on page 2 of their PDF catalog Norton's stone catalog
| Pam a.k.a. 柚子葉|
mi hatenu yume no
(This final scene, I
I will not see to the end.
My dream is fraying.)