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Grit size to micron comparison chart

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
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 +/-1.5 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
Grit Size

 

Average
Micrometer Size

 

Maximum
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
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
+/- (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 +/-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.