Micron to mesh to inch to millimeter conversion tables
Enquries to ecotao@yahoo.com
Use the below tables to convert between micron, mesh, millimeter and inch units.
A mesh could have a specification such as “POLYESTER 65/37”. This would be a 65 micron square hole and a 37 micron strand width making the mesh screen.
Another version
|
Micron
|
U.S. Mesh
|
Inches
|
|
2000
|
10
|
0.0787
|
|
1680
|
12
|
0.0661
|
|
1410
|
14
|
0.0555
|
|
1190
|
16
|
0.0469
|
|
1000
|
18
|
0.0394
|
|
841
|
20
|
0.0331
|
|
707
|
25
|
0.028
|
|
595
|
30
|
0.0232
|
|
500
|
35
|
0.0197
|
|
420
|
40
|
0.0165
|
|
354
|
45
|
0.0138
|
|
297
|
50
|
0.0117
|
|
250
|
60
|
0.0098
|
|
210
|
70
|
0.0083
|
|
177
|
80
|
0.007
|
|
149
|
100
|
0.0059
|
|
125
|
120
|
0.0049
|
|
105
|
140
|
0.0041
|
|
88
|
170
|
0.0035
|
|
74
|
200
|
0.0029
|
|
63
|
230
|
0.0024
|
|
53
|
270
|
0.0021
|
|
44
|
325
|
0.0017
|
|
37
|
400
|
0.0015
|
|
Typical wire diameters:
|
"Alternate" designations are derived from ASTM specification E-11-95
|
|
Sieve Designation
|
Nominal Sieve Opening
|
Nominal Wire Diameter
|
Suggested Screen
|
|
Standard
|
Alternate
|
mm
|
inches
|
mm
|
inches
|
|
|
125 mm
|
5"
|
125
|
4.921"
|
8
|
0.3149
|
5" OP
|
|
106 mm
|
4.24"
|
106
|
4.173"
|
6.4
|
0.2519
|
4-1/4" OP
|
|
100 mm
|
4"
|
100
|
3.937"
|
6.3
|
0.248
|
4" OP
|
|
90 mm
|
3-1/2"
|
90
|
3.543"
|
6.08
|
0.2393
|
3-1/2" OP
|
|
75 mm
|
3"
|
75
|
2.952"
|
5.8
|
0.2283
|
3" OP
|
|
63 mm
|
2-1/2"
|
63
|
2.480"
|
5.5
|
0.2165
|
2-1/2" OP
|
|
53 mm
|
2.12"
|
53
|
2.086"
|
5.15
|
0.2027
|
2-1/8" OP
|
|
50 mm
|
2"
|
50
|
1.968"
|
5.05
|
0.1988
|
2" OP
|
|
Sieve Designation
|
Nominal Sieve Opening
|
Nominal Wire Diameter
|
Suggested Screen
|
|
Standard
|
Alternate
|
mm
|
inches
|
mm
|
inches
|
|
|
45 mm
|
1-3/4"
|
45
|
1.771"
|
4.85
|
0.1909
|
1-3/4" OP
|
|
37.5 mm
|
1-1/2"
|
37.5
|
1.476"
|
4.59
|
0.1807
|
1-1/2" OP
|
|
31.5 mm
|
1-1/4"
|
31.5
|
1.240"
|
4.23
|
0.1665
|
1-1/4" OP
|
|
26.5 mm
|
1.06"
|
26.5
|
1.043"
|
3.9
|
0.1535
|
1-1/16" OP
|
|
25.0 mm
|
1"
|
25
|
0.984"
|
3.8
|
0.1496
|
1" OP
|
|
22.4 mm
|
7/8"
|
22.4
|
0.881"
|
3.5
|
0.1377
|
7/8" OP
|
|
19.0 mm
|
3/4"
|
19
|
0.748"
|
3.3
|
0.1299
|
3/4" OP
|
|
16.0 mm
|
5/8"
|
16
|
0.629"
|
3
|
0.1181
|
5/8" OP
|
|
Sieve Designation
|
Nominal Sieve Opening
|
Nominal Wire Diameter
|
Suggested Screen
|
|
Standard
|
Alternate
|
mm
|
inches
|
mm
|
inches
|
|
|
13.2 mm
|
.530"
|
13.2
|
0.519"
|
2.75
|
0.1082
|
17/32" OP
|
|
12.5 mm
|
1/2" **
|
12.5
|
0.492"
|
2.67
|
0.1051
|
1/2" OP
|
|
11.2 mm
|
7/16"
|
11.2
|
0.440"
|
2.45
|
0.0964
|
7/16" OP
|
|
9.5 mm
|
3/8"
|
9.5
|
0.374"
|
2.27
|
0.0893
|
3/8" OP
|
|
8.0 mm
|
5/16"
|
8
|
0.314"
|
2.07
|
0.0814
|
2-1/2 Mesh
|
|
6.7 mm
|
.265"
|
6.7
|
0.263"
|
1.87
|
0.0736
|
3 Mesh
|
|
6.3 mm
|
1/4" **
|
6.3
|
0.248"
|
1.82
|
0.0716
|
3-1/4 Mesh
|
|
5.6 mm
|
No. 3-1/2
|
5.6
|
0.220"
|
1.68
|
0.0661
|
3-1/2 Mesh
|
|
**These sieve specifications are not in the standard series, they are included due to popular usage.
|
|
Sieve Designation
|
Nominal Sieve Opening
|
Nominal Wire Diameter
|
Suggested Screen
|
|
Standard
|
Alternate
|
mm
|
inches
|
mm
|
inches
|
|
|
4.75 mm
|
No. 4
|
4.75
|
0.187"
|
1.54
|
0.0606
|
4 Mesh
|
|
4.0 mm
|
No. 5
|
4
|
0.157"
|
1.37
|
0.0539
|
5 Mesh
|
|
3.35 mm
|
No. 6
|
3.35
|
0.131"
|
1.23
|
0.0484
|
6 Mesh
|
|
2.80 mm
|
No. 7
|
2.8
|
0.131"
|
1.1
|
0.0433
|
7 Mesh
|
|
2.36 mm
|
No. 8
|
2.36
|
0.093"
|
1
|
0.0393
|
8 Mesh
|
|
2.00 mm
|
No. 10
|
2
|
0.078"
|
0.9
|
0.0354
|
9 Mesh
|
|
1.70 mm
|
No. 12
|
1.7
|
0.066"
|
0.81
|
0.0318
|
10 Mesh
|
|
1.40 mm
|
No. 14
|
1.4
|
0.055"
|
0.72
|
0.0285
|
12 Mesh
|
|
Sieve Designation
|
Nominal Sieve Opening
|
Nominal Wire Diameter
|
Suggested Screen
|
|
Standard
|
Alternate
|
mm
|
inches
|
mm
|
inches
|
|
|
1.18 mm
|
No. 16
|
1.18
|
0.0464"
|
0.65
|
0.0255
|
14 Mesh
|
|
1.00 mm
|
No. 18
|
1
|
0.0393"
|
0.58
|
0.0228
|
16 Mesh
|
|
850 µm
|
No. 20
|
0.85
|
0.0334"
|
0.51
|
0.02
|
20 Mesh
|
|
710 µm
|
No. 25
|
0.71
|
0.0279"
|
0.45
|
0.0177
|
24 Mesh
|
|
600 µm
|
No. 30
|
0.6
|
0.0236"
|
0.39
|
0.0153
|
28 Mesh
|
|
500 µm
|
No. 35
|
0.5
|
0.0196"
|
0.34
|
0.0133
|
32 Mesh
|
|
425 µm
|
No. 40
|
0.425
|
0.0167"
|
0.29
|
0.0114
|
35 Mesh
|
|
355 µm
|
No. 45
|
0.355
|
0.0139"
|
0.247
|
0.0097
|
42 Mesh
|
|
Sieve Designation
|
Nominal Sieve Opening
|
Nominal Wire Diameter
|
Suggested Screen
|
|
Standard
|
Alternate
|
mm
|
inches
|
mm
|
inches
|
|
|
300 µm
|
No. 50
|
0.3
|
0.0118"
|
0.215
|
0.0084
|
48 Mesh
|
|
250 µm
|
No. 60
|
0.25
|
0.0098"
|
0.18
|
0.007
|
60 Mesh
|
|
212 µm
|
No. 70
|
0.212
|
0.0083"
|
0.152
|
0.0059
|
65 Mesh
|
|
180 µm
|
No. 80
|
0.18
|
0.0070"
|
0.131
|
0.0051
|
80 Mesh
|
|
150 µm
|
No. 100
|
0.15
|
0.0059"
|
0.11
|
0.0043
|
100 Mesh
|
|
125 µm
|
No. 120
|
0.125
|
0.0049"
|
0.091
|
0.0035
|
115 Mesh
|
|
106 µm
|
No. 140
|
0.106
|
0.0041"
|
0.076
|
0.0029
|
100 Mesh
|
|
90 µm
|
No. 170
|
0.09
|
0.0035"
|
0.064
|
0.0025
|
170 Mesh
|
|
|
|
|
|
|
|
|
|
Sieve Designation
|
Nominal Sieve Opening
|
Nominal Wire Diameter
|
Suggested Screen
|
|
Standard
|
Alternate
|
mm
|
inches
|
mm
|
inches
|
|
|
75 µm
|
No. 200
|
0.075
|
0.0029"
|
0.053
|
0.002
|
200 Mesh
|
|
63 µm
|
No. 230
|
0.063
|
0.0024"
|
0.044
|
0.0017
|
250 Mesh
|
|
53 µm
|
No. 270
|
0.053
|
0.0020"
|
0.037
|
0.0014
|
270 Mesh
|
|
45 µm
|
No. 325
|
0.045
|
0.0017"
|
0.03
|
0.0012
|
325 Mesh
|
|
38 µm
|
No. 400
|
0.038
|
0.0015"
|
0.025
|
0.001
|
400 Mesh
|
|
32 µm
|
No. 450
|
0.032
|
0.0012"
|
0.0011
|
0.0004
|
|
|
25 µm
|
No. 500
|
0.025
|
0.00098"
|
0.001
|
0.000039
|
|
|
20 µm
|
No. 635
|
0.02
|
0.00078"
|
0.0008
|
0.000031
|
|
|
 "micron-mesh3")
