Norton waterstones

Waterstone line

Norton publishes no particle size for its waterstones. These microns are our estimates from secondary sources keyed to the JIS grit number, so the marks are faded. The real distribution is unknown.

Each grade below shows its size in microns, its spread (the published distribution, where a maker or standard gives one; most makers publish none), and where that size lands on the reference scale, a shared yardstick for reading grit numbers across makers.

Particle sizemicrons, log

50302010532

coarserfiner

inkmeasured or standardmaker figureour estimate

shapeknown distributionpoint, spread unknown

#220Our estimate

Norton

60 µm

C-estimated.

spread not published · reference scale about #230

#1000Our estimate

Norton

14 µm

C-estimated.

spread not published · reference scale about #800

#4000Our estimate

Norton

3 µm

C-estimated.

spread not published · reference scale about #4000

#8000Our estimate

Norton

1.2 µm

C-estimated.

spread not published · reference scale about #8000