Standard Sieve Series Specifications	printable page
Woven Wire Cloth
The "Standard" designations listed below correspond to the values for test sieve apertures recommended by the International Standards Organization (ISO) Geneva, Switzerland.
"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" 8.00 .3149 5" OP 106 mm 4.24" 106 4.173" 6.40 .2519 4-1/4" OP 100 mm 4" 100 3.937" 6.30 .2480 4" OP 90 mm 3-1/2" 90 3.543" 6.08 .2393 3-1/2" OP 75 mm 3" 75 2.952" 5.80 .2283 3" OP 63 mm 2-1/2" 63 2.480" 5.50 .2165 2-1/2" OP 53 mm 2.12" 53 2.086" 5.15 .2027 2-1/8" OP 50 mm 2" 50 1.968" 5.05 .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 .1909 1-3/4" OP 37.5 mm 1-1/2" 37.5 1.476" 4.59 .1807 1-1/2" OP 31.5 mm 1-1/4" 31.5 1.240" 4.23 .1665 1-1/4" OP 26.5 mm 1.06" 26.5 1.043" 3.90 .1535 1-1/16" OP 25.0 mm 1" 25.0 0.984" 3.80 .1496 1" OP 22.4 mm 7/8" 22.4 0.881" 3.50 .1377 7/8" OP 19.0 mm 3/4" 19.0 0.748" 3.30 .1299 3/4" OP 16.0 mm 5/8" 16.0 0.629" 3.00 .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 .1082 17/32" OP 12.5 mm 1/2" ** 12.5 0.492" 2.67 .1051 1/2" OP 11.2 mm 7/16" 11.2 0.440" 2.45 .0964 7/16" OP 9.5 mm 3/8" 9.5 0.374" 2.27 .0893 3/8" OP 8.0 mm 5/16" 8.0 0.314" 2.07 .0814 2-1/2 Mesh 6.7 mm .265" 6.7 0.263" 1.87 .0736 3 Mesh 6.3 mm 1/4" ** 6.3 0.248" 1.82 .0716 3-1/4 Mesh 5.6 mm No. 3-1/2 5.6 0.220" 1.68 .0661 3-1/2 Mesh
**Sieve specifications not in the standard series 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 .0606 4 Mesh 4.0 mm No. 5 4.00 0.157" 1.37 .0539 5 Mesh 3.35 mm No. 6 3.35 0.131" 1.23 .0484 6 Mesh 2.80 mm No. 7 2.80 0.131" 1.10 .0433 7 Mesh 2.36 mm No. 8 2.36 0.093" 1.00 .0393 8 Mesh 2.00 mm No. 10 2.00 0.078" 0.90 .0354 9 Mesh 1.70 mm No. 12 1.70 0.066" 0.81 .0318 10 Mesh 1.40 mm No. 14 1.40 0.055" 0.72 .0285 12 Mesh
Sieve Designation Nominal Sieve Opening Nominal Wire Diameter Suggested Screen Standard Alternate mm inches mm inches   1.18 mm No. 16 1.180 0.0464" 0.650 .0255 14 Mesh 1.00 mm No. 18 1.000 0.0393" 0.580 .0228 16 Mesh 850 µm No. 20 0.850 0.0334" 0.510 .0200 20 Mesh 710 µm No. 25 0.710 0.0279" 0.450 .0177 24 Mesh 600 µm No. 30 0.600 0.0236" 0.390 .0153 28 Mesh 500 µm No. 35 0.500 0.0196" 0.340 .0133 32 Mesh 425 µm No. 40 0.425 0.0167" 0.290 .0114 35 Mesh 355 µm No. 45 0.355 0.0139" 0.247 .0097 42 Mesh
Sieve Designation Nominal Sieve Opening Nominal Wire Diameter Suggested Screen Standard Alternate mm inches mm inches   300 µm No. 50 0.300 0.0118" 0.215 .0084 48 Mesh 250 µm No. 60 0.250 0.0098" 0.180 .0070 60 Mesh 212 µm No. 70 0.212 0.0083" 0.152 .0059 65 Mesh 180 µm No. 80 0.180 0.0070" 0.131 .0051 80 Mesh 150 µm No. 100 0.150 0.0059" 0.110 .0043 100 Mesh 125 µm No. 120 0.125 0.0049" 0.091 .0035 115 Mesh 106 µm No. 140 0.106 0.0041" 0.076 .0029 100 Mesh 90 µm No. 170 0.090 0.0035" 0.064 .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 .0020 200 Mesh 63 µm No. 230 0.063 0.0024" 0.044 .0017 250 Mesh 53 µm No. 270 0.053 0.0020" 0.037 .0014 270 Mesh 45 µm No. 325 0.045 0.0017" 0.030 .0012 325 Mesh 38 µm No. 400 0.038 0.0015" 0.025 .0010 400 Mesh 32 µm No. 450 0.032 0.0012" 0.0011 .0004   25 µm No. 500 0.025 0.00098" 0.0010 .000039   20 µm No. 635 0.020 0.00078" 0.0008 .000031