Chart: Grit Sizes

I made myself the following lookup chart for grit sizes from a variety of sources – let me know if you see blatant flaws in it. Even within a sizing “standard”, variations occur between sources and manufacturers.

Micron ANSI Grit Trizact Japanese Water Stone P-grade (Europe) Grit Western & Diamond Stone
1 2000 8000
2 6000
3 1500 A3 4000 P3000 Norton 8000 Waterstone
4 A5 3000
5 1200 Hard Black Arkansas
6 A6 2500
7.5 1000 2000 Norton 2000 Waterstone;
Toothpaste
 9 1200  P2000  Extra Fine Diamond;
Toothpaste
12 800 1000 P1500 Hard Arkansas; Fine Diamond; Toothpaste
14-15 800 P1200 Norton 1000 Waterstone
 16 600 A16  Extra Fine India
19-20 500 A20 600 P1000  Soft Arkansas
22-30 400 A30 400 Fine India; Norton 600 Waterstone
35-40 280 A45 360 P400 Medium Diamond
40-50 240 A60 320 P360 Fine Crystolon; Course Diamond
57-63 220 A80 240 P240
75-80 180 A110 P180 Course India; Medium Crystolon; Extra Course Diamond
89-97 150 A130 P150
102 120 Extra Extra Course Diamond
 122-127 100 A160 P120 Course Crystolon
165-195 80 A300 P80
254-260 60 P60
305-326 50 P50
483-524 36 P36
686-740 24 P24