Wire Mesh Size Chart Explained — Mesh Count vs Micron vs Wire Gauge
Last updated: September 2026 | 10 min read
Quick answer: Mesh count = number of wires per linear inch. Micron rating = particle size the mesh captures. Wire gauge = wire thickness (SWG or AWG). A 100-mesh screen typically filters ~150 micron particles, but the exact rating depends on wire diameter. Use the conversion tables below to specify the correct mesh for your application.
Table of Contents
1. The Three Ways to Measure Mesh Size
Wire mesh is measured using three different systems. Understanding how they relate prevents costly ordering mistakes.
Mesh Count
Number of wires per linear inch (25.4mm). Higher mesh count = smaller openings.
- • Measured by counting wires in 1 inch
- • Standard range: 2–635 mesh
- • Most common in US and Asia
- • Example: 100 mesh = 100 wires/inch
Micron Rating
Particle size in micrometers (μm) that the mesh can capture. Direct measure of filtration fineness.
- • 1 micron = 0.001mm
- • Standard range: 1–5000 μm
- • Common in Europe and filtration industry
- • Example: 100 μm captures particles ≥0.1mm
Wire Gauge
Wire thickness. Lower gauge number = thicker wire. Two systems exist: SWG (British) and AWG (American).
- • SWG: Standard Wire Gauge
- • AWG: American Wire Gauge
- • Range: 8 gauge (4mm) to 40 gauge (0.08mm)
- • Always specify in mm to avoid confusion
Critical Insight
Mesh count alone does not determine filtration rating. A 100-mesh screen with 0.10mm wire filters ~150 microns. With 0.08mm wire, it filters ~154 microns but has 8% more open area. Always specify both mesh count and wire diameter when ordering.
2. Complete Mesh-to-Micron Conversion Table
Standard conversion for plain weave stainless steel wire mesh with typical wire diameters:
| Mesh Count | Micron Rating | Wire Diameter (mm) | Wire Gauge (SWG) | Open Area % | Typical Use |
|---|---|---|---|---|---|
| 8 | 2360 μm | 0.70 | 22 | 63% | Coarse screening |
| 10 | 2000 μm | 0.60 | 23 | 62% | Mining, aggregates |
| 12 | 1700 μm | 0.56 | 24 | 60% | Construction |
| 16 | 1180 μm | 0.45 | 26 | 57% | General industrial |
| 20 | 850 μm | 0.40 | 27 | 58% | Pre-filtration |
| 30 | 600 μm | 0.30 | 30 | 52% | Water treatment |
| 40 | 425 μm | 0.25 | 31 | 51% | Chemical processing |
| 50 | 300 μm | 0.20 | 33 | 50% | Pharmaceutical |
| 60 | 250 μm | 0.16 | 34 | 47% | Fine filtration |
| 80 | 180 μm | 0.12 | 36 | 44% | Water polishing |
| 100 | 150 μm | 0.10 | 37 | 42% | Pharma, food |
| 120 | 125 μm | 0.09 | 38 | 40% | Ultra-fine |
| 150 | 106 μm | 0.07 | 39 | 39% | Laboratory |
| 200 | 75 μm | 0.05 | 40 | 38% | Micro-filtration |
| 250 | 63 μm | 0.04 | 41 | 36% | Precision screening |
| 300 | 53 μm | 0.035 | 42 | 34% | Electronics |
| 400 | 38 μm | 0.030 | 43 | 32% | Battery materials |
| 500 | 25 μm | 0.025 | 44 | 30% | Nano-materials |
How to Read This Table
Example: 80 mesh, 0.12mm wire
- • 80 wires per inch = 80 × 0.12mm = 9.6mm occupied by wire
- • 25.4mm (1 inch) − 9.6mm = 15.8mm open space
- • 15.8mm ÷ 80 openings = 0.1975mm ≈ 198 micron aperture
- • Actual filtration rating ~180 micron (accounts for particle shape)
Use our interactive mesh size chart for instant conversion with customizable wire diameter, or our mesh count conversion tool for the full ASTM E11 sieve table.
3. Wire Gauge Explained (SWG vs AWG)
Wire gauge systems are historical and confusing. Two gauges with the same number have different thicknesses.
| SWG (British) | AWG (American) | Diameter (mm) | Common Mesh Use |
|---|---|---|---|
| 20 | 19 | 0.91 | Heavy industrial mesh |
| 22 | 21 | 0.71 | Coarse screening |
| 24 | 22 | 0.56 | Construction mesh |
| 26 | 24 | 0.45 | General purpose |
| 28 | 26 | 0.38 | Filtration support |
| 30 | 28 | 0.31 | Fine mesh |
| 32 | 30 | 0.27 | Pharmaceutical |
| 34 | 32 | 0.23 | Fine filtration |
| 36 | 34 | 0.19 | Ultra-fine |
| 38 | 36 | 0.15 | Laboratory |
| 40 | 38 | 0.12 | Micro-filtration |
Pro Tip: Always Specify in Millimeters
Avoid gauge confusion entirely. When ordering from factories, specify wire diameter in millimeters (e.g., "0.25mm wire" not "31 gauge"). This eliminates errors and ensures you receive exactly what you expect.
4. Open Area Percentage and Flow Rate
Open area percentage determines how much fluid or air can pass through the mesh. Higher open area = higher flow rate, lower pressure drop.
| Mesh Count | Wire Diameter (mm) | Open Area % | Relative Flow Rate |
|---|---|---|---|
| 20 | 0.40 | 58% | High |
| 40 | 0.25 | 51% | Medium-High |
| 60 | 0.16 | 47% | Medium |
| 100 | 0.10 | 42% | Medium-Low |
| 200 | 0.05 | 38% | Low |
| 400 | 0.03 | 32% | Very Low |
When Open Area Matters Most
- High-viscosity fluids: Need higher open area to prevent clogging
- High-flow applications: Lower mesh count or thinner wire reduces pressure drop
- Vacuum filtration: Balance open area with particle retention
- Screen printing: Open area affects ink deposit thickness
5. How to Select the Right Mesh Size
Step 1: Define Your Particle Size
What size particle do you need to capture? Use a particle size analyzer or reference material specifications. If capturing 100-micron particles, choose a mesh with 100-micron or smaller rating.
Step 2: Choose Filtration Efficiency
Nominal filtration: Captures ~98% of particles at rated size. Standard for most applications.
Absolute filtration: Captures 99.9%+ of particles. Required for critical applications (pharma, electronics). Use dutch weave for absolute ratings below 100 microns.
Step 3: Balance Flow Rate and Retention
Finer mesh = lower flow rate. If your process requires high throughput, consider:
- • Larger filter surface area (multiple layers or bigger screen)
- • Thinner wire diameter (higher open area, same mesh count)
- • Backflushing or cleaning system
Step 4: Consider Process Conditions
Temperature, pressure, chemical exposure, and abrasion all affect mesh selection. Refer to our filtration buying guide for material selection.
6. International Standards Comparison
| Standard | Region | Mesh Count Range | Key Difference |
|---|---|---|---|
| ASTM E11 | US | 4–635 mesh | Standard test sieve cloth |
| ISO 3310 | International | 1–125 mm | Metric aperture sizes |
| ISO 9044 | International | All industrial mesh | Broader than ASTM E11 |
| JIS Z 8801 | Japan | Similar to ASTM | Slightly different wire diameters |
| GB/T 5330 | China | Equivalent to ISO 9044 | Used by Anping factories |
Practical Advice
When sourcing from Chinese factories, they typically manufacture to GB/T 5330 (Chinese standard) which is equivalent to ISO 9044. If you need ASTM E11 compliance, specify this explicitly and request testing documentation.
7. Frequently Asked Questions
What is the difference between mesh count and micron rating?
Why does the same mesh count have different micron ratings?
What is the finest mesh size available?
How do I measure mesh count on an existing sample?
What is the difference between SWG and AWG wire gauge?
Need Help Selecting the Right Mesh?
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