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Sieve Sizes: U.S. and Metric Sizes

See below for our sieve designation table comparing ASTM and ISO sieve size opening.

To order, click ASTM E11 or ISO 565/3310-1 sieves link.

Sieve mesh sizes are based on dimensions of the mesh size opening, or on the number of openings per linear inch. The two major standards governing test sieves and appropriate sizes are ASTM E11 and ISO 565/3310-1, both of which specify parameters for aperture dimensions, mesh size, and statistical variations. Opening sizes and mesh diameters for test sieves are often duplicated between these two standards, making it easier to select the proper sieve size for your material. The above table is a list of all available sieves in U.S. and metric sizes for both ASTM E11 and ISO 565/3310-1. Sieve mesh opening sizes range from 5in (125mm) down to #635 (20µm). The table outlines the standard, an alternate and the recommended sizes.

Gilson test sieves for particle size analysis of fine or coarse materials, soil, powder and other applications are available with brass or stainless steel frames fitted with brass or stainless steel cloth meeting ASTM or ISO standards. Common frame diameters, 3in (76mm), 8in (203mm), and 12in (305mm), as well as many ISO sizes in 200 mm and 300 mm frames, are in stock ready to ship. Other frame sizes such as 6in (152mm), 10in (254mm), and 18in (457mm) can be ordered. ASTM wire cloth is available cut-to-order or in bulk.