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40 mesh to micron: 425 µm (0.425 mm)
40 mesh is an opening of 425 microns, which is 0.425 mm or 0.0167 inch, on the ASTM E11 US standard sieve series. The nearest wedge wire equivalent is a 425 micron (0.425 mm) slot, because wedge wire is specified by its slot rather than a mesh count.
Opening425 µm
- Millimetres
- 0.425 mm
- Inches
- 0.01673 in
- Thou (mil)
- 16.73 thou
- Mesh
- 40 mesh
- Nearest coarser sieve
- 40 mesh, 425 µm
- Nearest finer sieve
- 40 mesh, 425 µm
Equivalent wedge wire slot: 425 micron (0.425 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
Mesh sizes near 40 mesh
| Mesh | Micron (µm) | mm |
|---|---|---|
| 25 mesh | 710 | 0.71 |
| 30 mesh | 600 | 0.6 |
| 35 mesh | 500 | 0.5 |
| 40 mesh | 425 | 0.425 |
| 45 mesh | 355 | 0.355 |
| 50 mesh | 300 | 0.3 |
| 60 mesh | 250 | 0.25 |
Swipe sideways to see the whole table.
What passes through 40 mesh
As a general reference on the Wentworth grade scale, particles smaller than 425 µm pass: fine sand, 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 425 micron (0.425 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.