Micron to mesh to inch to millimeter conversion tables
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Micron mesh tables
Use the below tables to convert between micron, mesh, millimeter and inch units.
A mesh could have a specification such as “POLYESTER 65/37”. This would be a 65 micron square hole and a 37 micron strand width making the mesh screen.
Another version for conversion between US mesh count, micron, inches and millimeters
Properties of nylon, polyester, polypropylene and polyethylene
Mesh suitability depends on the application temperature and pH. Nylon is more temperature resistant, while polyethylene is more acid resistant.
ASTM and ISO test sieve micron sizes
ISO sieves and ASTM test sieves are similar in their range for industrial applications.
| Test sieves, ISO and ASTM versions | |
| ASTM E11 Opening Size | ISO 565, 3310-1 Opening Size |
4in (100.0mm) | |
| 3-1/2in (90.0mm) | |
| 3in (75.0mm) | |
| 2-1/2in (63.0mm) | 63.0mm |
| 56.0mm | |
| 2.12in (53.0mm) | 53.0mm |
| 2in (50.0mm) | 50.0mm |
| 1-3/4in (45.0mm) | 45.0mm |
| 40.0mm | |
| 1-1/2in (37.5mm) | 37.5mm |
| 35.5mm | |
| 1-1/4in (31.5mm) | 31.5mm |
| 28.0mm | |
| 1.06in (26.5mm) | 26.5mm |
| 1in (25.0mm) | 25.0mm |
| 7/8in (22.4mm) | 22.4mm |
| 20.0mm | |
| 3/4in (19.0mm) | 19.0mm |
| 18.0mm | |
| 5/8in (16.0mm) | 16.0mm |
| 14.0mm | |
| 0.530in (13.2mm) | 13.2mm |
| 1/2in (12.5mm) | 12.5mm |
| 7/16in (11.2mm) | 11.2mm |
| 10.0mm | |
| 3/8in (9.5mm) | 9.5mm |
| 9.0mm | |
| 5/16in (8.0mm) | 8.0mm |
| 7.1mm | |
| 0.265in (6.7mm) | 6.7mm |
| 1/4in (6.3mm) | 6.3mm |
| No.3-1/2 (5.6mm) | 5.6mm |
| 5.0mm | |
| No.4 (4.75mm) | 4.75mm |
| 4.50mm | |
| No.5 (4.0mm) | 4.00mm |
| No.6 (3.35mm) | 3.55mm |
| 3.35mm | |
| 1/8in (3.15mm) *Not a standard ASTM size | 3.15mm |
| No.7 (2.8mm) | 2.80mm |
| 2.50mm | |
| No.8 (2.36mm) | 2.36mm |
| 2.24mm | |
| No.10 (2.0mm) | 2.00mm |
| 1.80mm | |
| No.12 (1.7mm) | 1.70mm |
| 1.60mm | |
| No.14 (1.4mm) | 1.40mm |
| 1.25mm | |
| No.16 (1.18mm) | 1.18mm |
| 1.12mm | |
| No.18 (1.0mm) | 1.00mm |
| 900µm | |
| No.20 (850µm) | 850µm |
| 800µm | |
| No.25 (710µm) | 710µm |
| 630µm | |
| No.30 (600µm) | 600µm |
| 560µm | |
| No.35 (500µm) | 500µm |
| 450µm | |
| No.40 (425µm) | 425µm |
| 400µm | |
| No.45 (355µm) | 355µm |
| 315µm | |
| No.50 (300µm) | 300µm |
| 280µm | |
| No.60 (250µm) | 250µm |
| 224µm | |
| No.70 (212µm) | 212µm |
| 200µm | |
| No.80 (180µm) | 180µm |
| 160µm | |
| No.100 (150µm) | 150µm |
| 140µm | |
| No.120 (125µm) | 125µm |
| 112µm | |
| No.140 (106µm) | 106µm |
| 100µm | |
| No.170 (90µm) | 90µm |
| 80µm | |
| No.200 (75µm) | 75µm |
| 71µm | |
| No.230 (63µm) | 63µm |
| 56µm | |
| No.270 (53µm) | 53µm |
| 50µm | |
| No.325 (45µm) | 45µm |
| 40µm | |
| No.400 (38µm) | 38µm |
| 36µm | |
| No.450 (32µm) | 32µm |
| No.500 (25µm) | 25µm |
| No.635 (20µm) | 20µm |