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This grit chart is designed to give a general guideline for correlating FEPA, ANSI and JIS grit sizes to approximate micrometer sizes of the grit sizes. Washington Mills does not guarantee exact measurements, but the chart can be used to make general size comparisons.
|
Fepa |
|
D50 |
|
|---|---|---|---|
| F 230 | 82 | 53 +/-3 | 34 |
| F 240 | 70 | 44.5 +/-2 | 28 |
| F 280 | 59 | 36.5 +/-1.5 | 22 |
| F 320 | 49 | 29.2 +/-1.5 | 16.5 |
| F 360 | 40 | 22.8 +/-1.5 | 12 |
| F 400 | 32 | 17.3 +/-1.5 | 8 |
| F 500 | 25 | 12.8 +/-1 | 5 |
| F 600 | 19 | 9.3 +/-1 | 3 |
| F 800 | 14 | 6.5 +/-1 | 2 |
| F 1000 | 10 | 4.5 +/-0.8 | 1 |
| F 1200 | 7 | 3 +/-0.5 | 1 (at 80%) |
| F 1500 | 5 | 2 +/-0.4 | 0.8 (at 80%) |
| F 2000 | 3.5 | 1.2 +/-0.3 | 0.5 (at 80%) |
|
ANSI |
Average |
Maximum |
Minimum |
| 8 | 3300 | 2210 | 1650 |
| 10 | 2667 | 1854 | 1397 |
| 12 | 2286 | 1600 | 1143 |
| 14 | 1905 | 1346 | 940 |
| 16 | 1650 | 1092 | 787 |
| 20 | 940 | 1346 | 660 |
| 24 | 1092 | 686 | 457 |
| 30 | 813 | 559 | 356 |
| 36 | 762 | 483 | 305 |
| 46 | 559 | 356 | 241 |
| 54 | 496 | 305 | 203 |
| 60 | 406 | 254 | 165 |
| 70 | 330 | 203 | 127 |
| 80 | 292 | 165 | 102 |
| 90 | 241 | 145 | 89 |
| 100 | 203 | 122 | 63 |
| 120 | 165 | 102 | 50 |
| 150 | 140 | 89 | 38 |
| 180 | 114 | 76 | 25 |
| 220 | 102 | 63 | 20 |
| 240 | 85 | 50 | 25 |
| 280 | 70 | 39 | 19 |
| 320 | 60 | 31 | 14 |
| 400 | 45 | 22 | 11 |
| 500 | 40 | 19 | 10 |
| 600 | 35 | 16 | 9 |
| 700 | 32 | 14 | 7 |
| 800 | 30 | 12 | 5 |
| 900 | 23 | 9 | 3 |
| 1000 | 23 | 7 | 2 |
| CF1 | 95 | 48 | 22 |
| F | 77 | 40 | 18 |
| FF | 67 | 33 | 14 |
| FFF Coarse | 55 | 25 | 11 |
| FFF | 45 | 19 | 10 |
| FFFF | 35 | 11 | 4 |
|
JIS Grit Size |
D3% Max(micrometer) |
D50 |
D94% Min (micrometer) |
| 240 | 103 | 57 +/-3 | 40 |
| 280 | 87 | 48 +/-3 | 33 |
| 320 | 74 | 40 +/-2.5 | 27 |
| 360 | 66 | 35 +/-2 | 23 |
| 400 | 58 | 30 +/-2 | 20 |
| 500 | 50 | 25 +/-2 | 16 |
| 600 | 43 | 20 +/-1.5 | 13 |
| 700 | 37 | 17 +/-1.3 | 11 |
| 800 | 31 | 14 +/-1 | 9 |
| 1000 | 27 | 11.5 +/-1 | 7 |
| 1200 | 23 | 9.5 +/-0.8 | 5.5 |
| 1500 | 20 | 8 +/-0.6 | 4.5 |
| 2000 | 17 | 6.7 +/-0.6 | 4 |
| 2500 | 14 | 5.5 +/-0.5 | 3 |
| 3000 | 11 | 4 +/-0.5 | 2 |
| 4000 | 8 | 3 +/-0.4 | 1.3 |
| 6000 | 5 | 2 +/-0.4 | 0.8 |
| 8000 | 3.5 | 1.2 +/-0.3 | 0.6 (at 75%) |
This chart is presented in good faith only as a approximation for correlating standard grit sizes to micron sizing. Washington Mills makes no warranty of exact measurements.