Cleveland Wire Cloth | Help | Conversions

U. S. Standard Sieve Series

Bureau of Standards
Sieve Number*
Specified
Sieve Opening
Specified
Wire Diameter
Inches
Tolerances Permitted
InchesMicrons Average OpeningWire DiameterMaximum Opening
4.1874760.050+ - 3%- 15% to + 30%10%
5.1574000.044+ - 3%- 15% to + 30%10%
6.1323360.040+ - 3%- 15% to + 30%10%
7.1112830.036+ - 3%- 15% to + 30%10%
8.09372380.0331+ - 3%- 15% to + 30%10%
10.07872000.0299+ - 3%- 15% to + 30%10%
12.06611680.0272+ - 3%- 15% to + 30%10%
14.05551410.0240+ - 3%- 15% to + 30%10%
16.04691190.0213+ - 3%- 15% to + 30%10%
18.03941000.0189+ - 3%- 15% to + 30%10%
20.0331840.0165+ - 5%- 15% to + 30%25%
25.0280710.0146+ - 5%- 15% to + 30%25%
30.0232590.0130+ - 5%- 15% to + 30%25%
35.0197500.0114+ - 5%- 15% to + 30%25%
40.0165420.0098+ - 5%- 15% to + 30%25%
45.0138350.0087+ - 5%- 15% to + 30%25%
50.0117297.0074+ - 6%- 15% to + 35%40%
60.0098250.0064+ - 6%- 15% to + 35%40%
70.0083210.0055+ - 6%- 15% to + 35%40%
80.0070177.0047+ - 6%- 15% to + 35%40%
100.0059149.0040+ - 6%- 15% to + 35%40%
120.0049125.0034+ - 6%- 15% to + 35%40%
140.0041105.0029+ - 8%- 15% to + 35%60%
170.003588.0025+ - 8%- 15% to + 35%60%
200.002974.0021+ - 8%- 15% to + 35%60%
230.002463.0018+ - 8%- 15% to + 35%90%
270.002153.0016+ - 8%- 15% to + 35%90%
325.001744.0014+ - 8%- 15% to + 35%90%

* "Sieve Numbers" assigned by the Bureau of Standards are arbitrary designations and do not refer to the number of meshes per inch.