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 |
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| 9 | 1200 | P2000 | Extra Fine Diamond; Toothpaste |
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| 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 |