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Tyler Table

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Typical openings in laboratory sieve series

BSS
5
6
7
8
10
12
14
16
18
22
25
30
36
44
52
60
72
85
100
120
150
170
200
240
300
350
440

Tyler
(approx)
4
6
7
8
9
10
12
14
16
20
24
28
32
35
42
48
60
65
80
100
115
150
170
200
250
270
325
400

US (approx)
4
6
7
8
10
12
14
16
18
20
25
30
35
40
45
50
60
70
80
100
120
140
170
200
230
270
325
400

Sieve size
(mm)
4.75
3.35
2.81
2.38
2.00
1.68
1.40
1.20
1.00
0.853
0.710
0.599
0.500
0.422
0.354
0.297
0.251
0.211
0.178
0.152
0.125
0.104
0.089
0.075
0.066
0.053
0.044
0.037

Inches
0.187
0.132
0.111
0.094
0.079
0.066
0.055
0.047
0.039
0.034
0.028
0.024
0.020
0.017
0.014
0.012
0.0099
0.0083
0.0070
0.0060
0.0049
0.0041
0.0035
0.0030
0.0026
0.0021
0.0017
0.0015

http://en.wikipedia.org/wiki/Mesh_(scale)
Tyler mesh size is the number of openings per (linear) inch of mesh.
Some standards use the mesh designation as the number of wires rather
than the size of openings (see Tyler, above). There can be significant
differences in particle size passing small laboratory screens versus large
heavy-duty industrial screens due to the different wire sizes used.
Thicker wire results in a smaller opening size for an equivalent mesh.

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