Three main systems

There are three primary systems of measuriing grit size:

US Graded (CAMI)

"P" Graded European

Micron

Yes, there are other methods but they are seldom used.

Grit size comparisons


Placeholder Image
US Graded (CAMI)
European Graded (FEPA)
Microns
Avg Dia
Mesh
Symbol
Mesh
Avg Dia
Microns
0.3
0.0000118
-
-
-
-
-
0.5
0.0000197
-
-
-
-
-
1.0
0.0000394
-
-
-
-
-
2.0
0.0000787
-
-
-
-
-
3.0
0.000118
-
-
-
-
-
4.0
0.000158
-
-
-
-
-
5.0
0.000197
-
-
-
-
-
 -
-
-
-
P2500
0.003701
 8.4
9.0
0.00035
-
-
-
-
-
9.2
0.00036
1000
-
-
-
-
 -
-
-
-
 P2000
 0.000405
 10.3
12.0
0.00047
-
-
-
-
-
12.2
0.00048
800
-
-
-
-
-
-
-
-
 P1500
 0.000496
12.6
15.0
0.00059
-
-
-
-
-
16.0
0.00062
600
-
P1200
0.00060
15.3
19.7
0.00077
500
-
P1000
0.00071
18.3
20.0
0.00079
-
-
-
-
-
23.6
0.00092
400
10/0
P800
0.00085
21.8
25.0
0.00098
-
-
-
-
-
28.8
0.00112
360
-
P600
0.00100
25.8
30.0
0.00118
-
 -
-
-
-
 -
-
-
-
P500
0.00118
30.2
36.0
0.00140
320
9/0
P400
0.00137
35.0
40.0
0.001575
-
-
-
-
-
 -
-
-
-
P360
0.00158
40.5
44.0
0.00172
280
8/0
-
-
-
45.0
0.00177
-
-
P320
0.00180
46.2
50.0
0.00197
-
-
-
-
-
53.5
0.00209
240
7/0
P280
0.00204
52.5
55.0
0.00217
-
-
-
-
-
66.0
0.00257
220
6/0
P220
0.00254
65.0
78.0
0.00304
180
5/0
P180
0.00304
78.0
93.0
0.00363
150
4/0
P150
0.00378
97.0
116.0
0.00452
120
3/0
P120
0.00495
127.0
141.0
0.0055
100
2/0
P100
0.00608
156.0
192.0
0.00749
80
0
P80
0.00768
197.0
268.0
0.01045
60
1/2
P60
0.01014
260.0
351.0
0.0139
50
1
P50
0.01271
326.0
428.0
0.0169
40
1-1/2
P40
0.01601
412.0
535.0
0.02087
36
2
P36
0.02044
524.0
638.0
0.02488
30
2-1/2
P30
0.02426
622.0
715.0
0.02789
24
3
P24
0.02886
740.0
905.0
0.03535
20
3-1/2
P20
0.03838
984.0
1320.0
0.05148
16
4
P16
0.05164
1324.0
1842.0
0.07174
12
4-1/2
P12
0.06880
1764.0
 

 

 

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