Grit Table / waterstones / Sigma Power Select II
Product, no maker data
Waterstone
No particle size in microns is published for this line. The values are our estimates from secondary sources, so the marks are faded and the spread 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.
C-estimated: Lee Valley effective-micron 60 (matches the JIS #240 band).
C-estimated from JIS (#400 = 28 to 32); not separately listed by Lee Valley.
C-estimated: Lee Valley effective-micron 14, COARSER than the JIS #1000 median (10.5 to 12.5).
C-estimated: Lee Valley effective-micron 7, coarser than JIS #3000 (3.5 to 4.5).
C-estimated from JIS (#6000 = 1.6 to 2.4); treat as a floor since the line runs coarse.
C-estimated: Lee Valley effective-micron 1.5.
C-estimated: Lee Valley effective-micron 0.9.