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What is Mesh Size?

Jun. 09, 2020


What is Mesh Size?U.S. Mesh Size (or U.S. Sieve Size) is defined as the number of openings in one square inch of a screen. For example, a 36 mesh screen will have 36 openings while a 150 mesh screen will have 150 openings. Since the size of screen (one square inch) is constant, the higher the mesh number the smaller the screen opening and the smaller the particle that will pass through. Generally US Mesh is measured using screens down to a 325 mesh (325 openings in one square inch). Sometimes the mesh size of a product in noted with either a minus (-) or plus (+) sign. These signs indicate that the particles are either all smaller than (-) or all larger than (+) the mesh size. For example, a product identified as -100 mesh would contain only particles that passed through a 100 mesh screen. A +100 grade would contain particles that did not pass through a 100 mesh screen. When a grade of product is noted with a dash or a slash is indicates that the product has particle contained within the two mesh sizes. For example, a 30/70 or 30-70 grade would only have particles that are smaller than 30 mesh and larger than 70 mesh.Mesh Conversion ChartThe chart below shows the approximate size in inches and microns for various mesh sizes. These values are generally accepted as accurate but are approximates because the thickness of the wire used to make a specific screen will vary the number of openings in the one square inch. A micron is one-millionth of a meter or one-twenty-five thousandths of an inch. Most grades below 325 mesh are indicated by the micron size as these sizes are not manufactured using screens. 

US MeshMicronInches
44,750 um0.187
54,000 um0.157
63,350 um0.132
72,800 um0.111
82,360 um0.0937
102,000 um0.0787
121,700 um0.0661
141,400 um0.0555
161,200 um0.0473
181,000 um0.0394
20850 um0.0331
24690 um0.027
30560 um0.022
36485 um0.019
40425 um0.016
46355 um0.014
54305 um0.012
60250 um0.01
70210 um0.0083
80165 um0.0065
90145 um0.0057
100149 um0.0059
120125 um0.0049
140105 um0.0041
15089 um0.0035
17088 um0.0031
18076 um0.003
20075 um0.0029
22063 um0.0025
24053 um0.002
28044 um0.0015
32036 um0.0012
40023 um0.00087
50019 um0.00075
60016 um0.00063
80012 um0.00047
1,0009 um0.00028
1,2006 um0.00024


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