ASTM Specification E-11

TABLE (1) Nominal Dimensions, Permissible Variations for Wire Cloth of Standard Test Sieves (U.S.A.) Standards Series

Sieve Designation

Nominal Sieve
Opening, in.²
Standard¹ Alternative
(1) (2) (3)
4.75 mm No. 4 0.187
3.35 mm No. 6 0.132
2.36 mm No. 8 0.0937
2.00 mm No. 10 0.0787
1.7 mm No. 12 0.0661
1.4 mm No. 14 0.0555
1.00 mm No. 18 0.0394
850 µm³ No. 20 0.0331
600 µm No. 30 0.0234
500 µm No. 35 0.0197
425 µm No. 40 0.0165
300 µm No. 50 0.0117
250 µm No. 60 0.0098
180 µm No. 80 0.0070
150 µm No. 100 0.0059
106 µm No. 140 0.0041
75 µm No. 200 0.0029
45 µm No. 325 0.0017
¹These standard designations correspond to the values for test sieve openings recommended by the International Standards Organization, Geneva, Switzerland, except where noted.
²Only approximately equivalent to the metric values in column (1).
³1000 µm = 1 mm