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250 micron to mm: 0.25 mm
250 microns is 0.25 mm, or 0.00984 inch. As a sieve opening it is 60 mesh on the ASTM E11 series. For a wedge wire screen, specify it directly as a 250 micron (0.25 mm) slot.
Opening250 µm
- Millimetres
- 0.25 mm
- Inches
- 0.009843 in
- Thou (mil)
- 9.843 thou
- Mesh
- 60 mesh
- Nearest coarser sieve
- 60 mesh, 250 µm
- Nearest finer sieve
- 60 mesh, 250 µm
Equivalent wedge wire slot: 250 micron (0.25 mm)
Wedge wire is specified by its slot directly, so a wedge wire screen has no mesh count. Quote the slot in mm or microns.
Your inputs and results go into the quote form, so an engineer can check them against your operating conditions.
Nearby sizes
Sizes near 250 microns
| Micron | mm | Mesh |
|---|---|---|
| 100 µm | 0.1 | about 150 |
| 150 µm | 0.15 | 100 |
| 200 µm | 0.2 | about 73 |
| 250 µm | 0.25 | 60 |
| 300 µm | 0.3 | 50 |
| 500 µm | 0.5 | 35 |
| 600 µm | 0.6 | 30 |
Swipe sideways to see the whole table.
What passes a 250 micron opening
As a general reference on the Wentworth grade scale, particles smaller than 250 µm pass: very fine sand, silt, clay. Real separation also depends on particle shape, the screen's open area and how the screen is loaded.
The wedge wire equivalent
A wedge wire screen is specified by its slot, so the equivalent is a 250 micron (0.25 mm) slot. Because the V-shaped wire widens behind the slot, particles that pass the face do not wedge in it. See mesh to micron and slot size and how to choose slot and open area.