Galvanized Expanded Metal Mesh
Galvanized expanded metal mesh with diamond pattern for ventilation and protection.
FOB reference price from $4.80 / m². Varies by spec and quantity; final quote on inquiry.
Plate Thickness
2–3 mm
Aperture
10–15 mm
Open Area
62–68%
Material
Galvanized Steel
Standard Specs
2
Sample
Available
Official Standard Tolerance SKU Matrix
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| Nominal Mesh Count | Std. Wire Dia. (mm)Std. Wire Dia. (inch / Gauge) | Aperture Size (mm)Aperture Size (inch) | Ref. Open Area | Est. Weight (kg/m²)Est. Weight (lb/ft²) | Micro Link | |
|---|---|---|---|---|---|---|
| Std. Plate Thickness | 2.000 mm0.07870" | 10.000 mm0.39370" | 62.0% | 3.10 kg/m²0.6300 lb/sq.ft | ||
| Std. Plate Thickness | 3.000 mm0.11810" | 15.000 mm0.59060" | 68.0% | 4.50 kg/m²0.9200 lb/sq.ft |
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100X Simulated Microscope Lens View (Auxiliary Physical Design)
Where Is Galvanized Expanded Metal Mesh Used?
Galvanized expanded metal is chosen where low-cost rigidity, open airflow and outdoor zinc protection must combine: slip-resistant walkways, stair treads and platform flooring, security fencing and perimeter screening, machine guards and safety enclosures, facade sunscreens, ventilation grilles, and drainage covers with high open area.
- Ventilation covers
- machine guards
- walkway grating
Metallurgical Composition & Alloy Ratio Analysis
Carbon Steel Base & Zinc Route Traceability
Every panel in this family is low-carbon steel slit and stretched into diamond openings, then protected by one of two traceable zinc routes: hot-dip galvanizing after expansion per ASTM A123 seals every cut strand end and junction, while expansion from pre-galvanized (electro or hot-dip) sheet leaves cut edges bare. Each bundle is labeled by coating route, form, LWD x SWD and coating mass class, and coating certificates per ASTM A123 are available on request.
All batches are tested via handheld PM-I spectrometer before Tianjin Port export, guaranteeing material compliance.
Zinc Coating & Service Limits
- Coating Route：Hot-dip after expansion dips the finished mesh in molten zinc and seals every cut edge; pre-galvanized sheet is coated before slitting, so cut strand ends expose bare steel and need zinc-rich paint touch-up.
- Zinc Coating Mass：Electro pre-galvanized carries 10-30 g/m2 for indoor duty; hot-dip after expansion delivers 45-300+ g/m2 per ASTM A123 and ISO 1461 for outdoor and walkway service.
- Cut-Edge Protection：Only after-expansion hot-dip covers every strand end and junction, so it is the default route for outdoor panels where edge rust is a rejection risk.
- Service Limit：Zinc coatings degrade above about 200 C, so this family stays in walkway, guard and facade duty; for chloride-heavy or high-temperature environments, upgrade to 316 stainless expanded metal.
Which ASTM A123 and NAAMM EMMA 557 Tolerances Apply to Galvanized Expanded Panels?
Two standards govern this family: ASTM A123 sets the zinc coating mass and adhesion of the hot-dip route, while NAAMM EMMA 557 controls the expanded geometry (SWD/LWD), squareness and camber. Confirm the applicable tolerance in your purchase order or incoming inspection plan, and request actual measured values in the pre-shipment report.
| Characteristic | Reference Standard | Standard Tolerance | Verified At |
|---|---|---|---|
| Zinc coating mass, hot-dip route | ASTM A123 / ISO 1461 | 45-300+ g/m2 by material thickness class | Coating certificate or weigh-strip-weigh check per ASTM A90 |
| Design size SWD / LWD | NAAMM EMMA 557 | -0, +1/2 in. per foot | Pre-shipment dimensional report |
| Out of square & camber | NAAMM EMMA 557 | 1/16 in. per foot of width/length | Flatness check before packing |
Where Do These Specifications Come From?
- “This specification covers the requirements for zinc coating (galvanizing) by the hot-dip process on iron and steel products made from rolled, pressed, or forged shapes, castings, plates, bars, and strips.”ASTM A123/A123M, Scope 1.1ASTM International - coating mass and adhesion basis for the hot-dip-after-expansion route
- “This publication sets forth the standard specifications for expanded metal, including diamond dimensions, tolerances, and flattening requirements.”NAAMM EMMA 557-20, Standard SpecificationsNAAMM Expanded Metal Division - geometry and tolerance basis for SWD/LWD, squareness and camber
Custom Processing for Expanded Metal · Quality Assurance for Expanded Metal · Packaging & Logistics
Custom Processing for Expanded Metal
Sheet-level fabrication for expanded metal panels.
Flattening Service
Raised expanded metal roller-flattened to a smooth surface for architectural panels and walkways.
Cut-to-Size Sheets
Sheets sheared to exact SWD/LWD orientation and dimensions, ready for framing or installation.
Framing & Edging
U-channel or angle frames welded to panels for machine guards, fences and facade cassettes.
Quality Assurance for Expanded Metal
Expanded metal is inspected for geometry and coating before dispatch.
Geometry Tolerance
Strand width, thickness and SWD/LWD measured against order tolerances on every batch.
Coating Verification
Galvanized or powder-coated finishes checked for thickness and adhesion per relevant standards.
Flatness Check
Panels inspected for camber and twist so sheets seat correctly in frames.
Packaging & Logistics
Flat-sheet packing that protects expanded metal edges and finish.
Sheet Pallets
Panels stacked on fumigated pallets with interleaving paper and steel strapping.
Edge Protection
Corner protectors and film wrapping guard cut edges and coated surfaces during handling.
Container Loading
Optimized 20GP / 40HQ loading plans with photos and loading reports shared before vessel departure.
Trade Terms
FOB Tianjin or CIF major ports; DHL, FedEx and SF Express available for sample shipments worldwide.
What Do Buyers Ask About Galvanized Expanded Metal Mesh?
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