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The term ‘Mesh’ is used to describe the size of a particle. This indicates the mean or average size of the range of particles in that grade. U.S. Mesh Size is defined as the number of openings in one square inch of a screen (e.g. No. 35 Mesh will have 35 openings per square inch). The chart below shows the approximate size in inches, millimetres and microns for numerous mesh sizes.
Particle size - Mesh to micron conversion
U.S. Mesh
Inches
Millimetres
Microns
1 in
1.00
25.4
25400
7/8 in
0.875
22.6
22600
3/4 in
0.750
19.0
19000
5/8 in
0.625
16.0
16000
0.530 in
0.530
13.5
13500
1/2 in
0.500
12.7
12700
7/16 in
0.438
11.2
11200
3/8 in
0.375
9.51
9510
5/16 in
0.312
8.00
8000
0.265 in
0.265
6.73
6370
1/4 in
0.250
6.35
6350
No. 3 1/2 in
0.223
5.66
5660
No. 4
0.187
4.76
4760
No. 5
0.157
4.00
4000
No. 6
0.132
3.36
3360
No. 7
0.111
2.83
2830
No. 8
0.0937
2.38
2380
No. 10
0.0787
2.00
2000
No. 12
0.0661
1.68
1680
No. 14
0.0555
1.41
1410
No. 16
0.0469
1.19
1190
No. 18
0.0394
1.00
1000
No. 20
0.0331
0.841
841
No. 25
0.0278
0.707
707
No. 30
0.0234
0.595
595
No. 35
0.0197
0.500
500
No. 40
0.0165
0.420
420
No. 45
0.0139
0.354
354
No. 50
0.0117
0.297
297
No. 60
0.0098
0.250
250
No. 70
0.0083
0.210
210
No. 80
0.0070
0.177
177
No. 100
0.0059
0.149
149
No. 120
0.0049
0.125
125
No. 140
0.0041
0.105
105
No. 170
0.0035
0.088
88
No. 200
0.0029
0.074
74
No. 230
0.0025
0.063
63
No. 270
0.0021
0.053
53
No. 325
0.0017
0.044
44
No. 400
0.0015
0.037
37
Tab content Volume
Tab content Mass/ Weight
Tab content Density
Tab content Length