GRIT SIZE To MICROMETER (Micron) COMPARISON CHART
This chart shows the grit sizes on the far left and the corresponding particle size in micrometers of those grit sizes (max, averages, mins) in the remaining columns.
| Fepa Grit Size | D3% Max (micrometer) | D50 +/- (average micrometer size) | D94% Min (micrometer) |
|---|---|---|---|
| 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 +/- 1.0 | 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 Grit Size | Maximum Micrometer Size | Average Micrometer Size | Minimum Micrometer Size |
| 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 |
| ANSI Grit Size | D3% Max (micrometer) | D50 +/- (average micrometer size) | D94% Min (micrometer) |
| 240 | 74 – 80 | 47 – 53 | 26 – 32 |
| 280 | 67 – 72 | 37 – 42 | 20 – 25 |
| 320 | 55 – 60 | 27 – 32 | 15 – 19 |
| 360 | 38 – 42 | 21 – 25 | 10.5 – 14.5 |
| 400 | 31.5 – 35.0 | 16.5 – 20 | 7.5 – 10.5 |
| 500 | 28.0 – 30.5 | 12.5 – 15.3 | 5.5 – 8.0 |
| 600 | 24.0 – 27.0 | 9.2 – 11.9 | - |
| 800 | 20.5 – 22.5 | 6.5 – 8.8 | - |
| 1000 | 16 – 18 | 5.2 – 6.4 | - |
| 1200 | 13.5 – 15.5 | 2.8 – 4.8 | - |
| F | 80 | 38 – 52 | 20 |
| FF | 45 – 55 | 23 – 32 | 9 – 16.5 |
| FFF | 35 | 12 – 20 | 5 |
| FFFF | 35 | 11 | 4 |
| JIS Grit Size | D3% Max (micrometer) | D50+/-(average micrometer size) | D94% Min (micrometer) |
| 240 | 103 | 57 +/- 3 | 40 |
| 280 | 87 | 48 +/- 3 | 33 |
| 320 | 74 | 40 +/- 2.5 | 27 |
| 360 | 66 | 35.5 – 37.0 | 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 information is offered in good faith only as a general guideline for correlating standard grit sizes to micron sizing. Washington Mills makes no warranty of exact measurements.