Particle Size Conversion Chart - FEPA

This chart is designed to compare millimeters, microns and inches to sieve sizes and match them to corresponding FEPA grit sizes.

Millimeters

Microns*

Inches

100 % min Sieve

20% max Sieve

40% min Sieve

70% min Sieve

3% max Sieve

FEPA Grit

4.75

4750

0.189

Mai 16

3 1/2

4

4+5

6

F4

4

4000

0.159

0.265

4

5

5+6

7

F5

3.35

3350

0.133

3 1/2

5

6

6+7

8

F6

2.8

2800

0.111

4

6

7

7+8

10

F7

2.36

2360

0.094

5

7

8

8+10

12

F8

2

2000

0.079

6

8

10

10+12

14

F10

1.7

1700

0.068

7

10

12

12+14

16

F12

     

100% min

20 % max

45% min

70% min

3% max thru

 

1.4

1400

0.056

8

12

14

14+16

18

F14

1.18

1180

0.047

10

14

16

16+18

20

F16

1

1000

0.04

12

16

18

18+20

25

F20

0.85

850

0.034

14

18

20

20+25

30

F22

     

100% min

25 % max

40% min

65% min

3% max thru

 

0.71

710

0.028

16

20

25

25+30

35

F24

0.6

600

0.024

18

25

30

30+35

40

F30

0.5

500

0.02

20

30

35

35+40

45

F36

     

100% min

30 % max

40% min

65% min

3% max thru

 

0.425

425

0.017

25

35

40

40+45

50

F40

0.355

355

0.014

30

40

45

45+50

60

F46

0.3

300

0.012

35

45

50

50+60

70

F54

0.25

250

0.01

40

50

60

60+70

80

F60

     

100% min

25 % max

40% min

65% min

3% max thru

 

0.212

212

0.008

45

60

70

70+80

100

F70

0.18

180

0.007

50

70

80

80+100

120

F80

     

100% min

20 % max

40% min

65% min

3% max thru

 

0.15

150

0.006

60

80

100

100+120

140

F90

0.125

125

0.005

70

100

120

120+140

200

F100

0.106

106

0.004

80

120

140

140+170

230

F120

     

100% min

15 % max

40% min

65% min

3% max thru

 

0.075

75

0.003

100

140

200

200+230

325

F150

0.063

63

0.0025

120

170

200 + 230

200+230+270

-

F180

     

100% min

15 % max

40% min

60% min

   

0.053

53

0.0021

140

200

230 + 270

230+270+325

-

F220

*Micron size is based upon the 40% min sieve.


Microgrits

Millimeters

Microns*

Inches

d3 max

d50

d94 min

FEPA Grit

0.053

53

0.00211

82

50.0 - 56.0

34

F230

0.0445

44.5

0.00177

70

42.5 - 46.5

28

F240

0.0365

36.5

0.00145

59

35.0 - 38.0

22

F280

0.0292

29.2

0.00116

49

27.7 - 30.7

16.5

F320

0.0228

22.8

0.00091

40

21.3 - 24.3

12

F360

0.0173

17.3

0.00069

32

16.3 - 18.3

8

F400

0.0128

12.8

0.00051

25

11.8 - 13.8

5

F500

0.0093

9.3

0.00037

19

8.3 - 10.3

3

F600

0.0065

6.5

0.00026

14

5.5 - 7.5

2

F800

0.0045

4.5

0.00018

10

3.7 - 5.3

1

F1000

0.003

3

0.00012

7

2.5 - 3.5

1 (at d80)

F1200

0.002

2

0.00008

5

1.6 - 2.4

0.8 (at d80)

F1500

0.0012

1.2

0.00005

3.5

0.9 - 1.5

0.5 (at d80)

F2000

*Micron size is based upon the average of the d50.