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20 mesh to micron: 850 µm (0.85 mm)
20 mesh is an opening of 850 microns, which is 0.85 mm or 0.0335 inch, on the ASTM E11 US standard sieve series. The nearest wedge wire equivalent is a 850 micron (0.85 mm) slot, because wedge wire is specified by its slot rather than a mesh count.
Opening850 µm
- Millimetres
- 0.85 mm
- Inches
- 0.03346 in
- Thou (mil)
- 33.46 thou
- Mesh
- 20 mesh
- Nearest coarser sieve
- 20 mesh, 850 µm
- Nearest finer sieve
- 20 mesh, 850 µm
Equivalent wedge wire slot: 850 micron (0.85 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 20 mesh
| Mesh | Micron (µm) | mm |
|---|---|---|
| 14 mesh | 1,400 | 1.4 |
| 16 mesh | 1,180 | 1.18 |
| 18 mesh | 1,000 | 1 |
| 20 mesh | 850 | 0.85 |
| 25 mesh | 710 | 0.71 |
| 30 mesh | 600 | 0.6 |
| 35 mesh | 500 | 0.5 |
Swipe sideways to see the whole table.
What passes through 20 mesh
As a general reference on the Wentworth grade scale, particles smaller than 850 µm pass: medium sand, 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 850 micron (0.85 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.