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 Size Comparison Chart
ASTM E11ISO 565/3310-1
100.0mm 4in -
90.0mm 3 1/2in -
75.0mm 3in -
63.0mm 2 1/2in 63.0mm
- - 56.0mm
53.0mm 2.12in 53.0mm
50.0mm 2in 50.0mm
45.0mm 1 3/4in 45.0mm
- - 40.0mm
37.5mm 1 1/2in 37.5mm
- - 35.5mm
31.5mm 1 1/4in 31.5mm
- - 28.0mm
26.5mm 1.06in 26.5mm
25.0mm 1in 25.0mm
22.4mm 7/8in 22.4mm
- - 20.0mm
19.0mm 3/4in 19.0mm
18.0mm - 18.0mm
16.0mm 5/8in 16.0mm
- - 14.0mm
13.2mm 0.530in 13.2mm
12.5mm 1/2in 12.5mm
11.2mm 7/16in 11.2mm
- - 10.0mm
9.5mm 3/8in 9.5mm
- - 9.0mm
8.0mm 5/16in 8.0mm
- - 7.1mm
6.7mm 0.265in 6.7mm
6.3mm 1/4in 6.3mm
5.6mm No. 3 1/2 5.6mm
- - 5.0mm
4.75mm No.4 4.75mm
- - 4.50mm
4.00mm No.5 4.00mm
3.55mm - 3.55mm
3.35mm No.6 3.35mm
- 1/8in* -
3.15mm - 3.15mm
2.80mm No.7 2.80mm
- - 2.50mm
2.36mm No.8 2.36mm
2.00mm No.10 2.00mm
- - 1.80mm
1.70mm No.12 1.70mm
- - 1.60mm
1.40mm No.14 1.40mm
- - 1.25mm
1.18mm No.16 1.18mm
- - 1.12mm
1.00mm No.18 1.00mm
- - 900µm
850μm No.20 850µm
- - 800µm
710μm No.25 710µm
- - 630µm
600μm No.30 600µm
- - 560µm
500μm No.35 500µm
- - 450µm
425μm No.40 425µm
- - 400µm
355μm No.45 355µm
- - 315µm
300μm No.50 300µm
- - 280µm
250μm No.60 250µm
- - 224µm
212μm No.70 212µm
- - 200µm
180μm No.80 180µm
- - 160µm
150μm No.100 150µm
- - 140µm
125μm No.120 125µm
- - 112µm
106μm No.140 106µm
- - 100µm
90μm No.170 90µm
- - 80µm
75μm No.200 75µm
- - 71µm
63μm No.230 63µm
- - 56µm
53μm No.270 53µm
- - 50µm
45μm No.325 45µm
- - 40µm
38μm No.400 38µm
- - 36µm
32µm No.450 32µm
25µm No.500 25µm
20µm No.635 20µm
* Not a standard ASTM size.

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.