Mesh Count
120
Openings per linear inch
Sifting Solutions
120 mesh corresponds to a nominal opening of 125 microns (0.125 mm). In botanical screening, this is generally treated as a fine separation step for dry sift, pollen, and powder handling lines.
Mesh Count
120
Openings per linear inch
Opening
125 microns
0.125 mm
Opening Inch
0.00492
Nominal clear opening
Open Area
34.9%
Wire diameter 0.087 mm
| Mesh count | 120 |
|---|---|
| Nominal opening (micron) | 125 microns |
| Nominal opening (millimeter) | 0.125 mm |
| Nominal opening (inch) | 0.00492 in |
| Nominal wire diameter | 0.087 mm |
| Nominal open area | 34.9% |
A 120 mesh screen is built with 120 openings per linear inch. For this reference, the clear opening is listed at 125 microns, with a nominal wire diameter of 0.087 mm and an open area near 34.9%. These values are used for engineering comparison, not as a substitute for final supplier drawings.
At 125 microns, this screen size tends to tighten the cut point so finer resin-rich fractions can be graded with less oversized carryover. In production terms, it sits in the fine part of the screening range and is usually selected after operators define the target fraction, feed dryness, and deck loading rate.
These formulas explain the unit relationship shown in the table.
Micron from mm
micron = mm x 1000
0.125 mm x 1000 = 125 microns
mm from micron
mm = micron / 1000
125 / 1000 = 0.125 mm
Inch conversion
inch = micron / 25400
125 / 25400 = 0.00492 in
Process notes are assembled directly from the selected opening value so each page stays consistent with the table above.
When a 120 mesh screen is used for pollen collection, the nominal opening is 125 microns. This range is often selected when operators want a cleaner pass while still keeping a usable collection rate.
For dry sift separation, 120 mesh gives a nominal clear opening of 125 microns. At this point the screen is acting as a fine classification layer, so feed consistency and blinding control become more important.
In powder grading work, 120 mesh is roughly equivalent to 125 microns. This opening fits controlled grading steps where mid-size powder fractions need to be standardized before packaging or blending.
For botanical pre-screening, a 120 mesh cloth opens at about 125 microns. At this fineness the screen is no longer a rough pre-screen. It becomes a precision control point inside a multi-stage grading workflow.
110 mesh at 135 microns will pass a coarser cut and hold higher throughput. 130 mesh at 115 microns will shift the cut point finer and tighten material control.
Nominal opening values were curated from commonly referenced industrial wire cloth and U.S. sieve conversion charts. Actual clear opening can vary by weave style, wire diameter, and manufacturing tolerance.
Nominal opening values may vary slightly by weave and wire diameter. For purchase approval, always confirm the actual cloth specification issued by the manufacturer.