How to Choose Expanded Metal
A practical guide to selecting SWD, LWD, and strand configuration for architectural, industrial, and enclosure applications.
Core dimensional variables
Standard nomenclature reference
Short way of design
Distance from the center of one bond to the center of the next bond along the short diamond axis.
Long way of design
Distance from the center of one bond to the center of the next bond along the long diamond axis.
Width & thickness
The width of metal fed per stroke and the gauge thickness of the base sheet before expanding.
Expanded metal specification guide
Find the right mesh dimensions, profile style, and material grade for your load and open area requirements.
1. Diamond geometry & mesh dimensions
Expanded metal is measured across the axes of the diamond. Always specify the Short Way of Diamond (SWD) first, followed by the Long Way of Diamond (LWD).
Distance measured from the center of a bond to the center of the adjacent bond across the short diamond axis.
Distance measured from the center of a bond to the center of the adjacent bond along the long diamond axis.
The amount of metal slit and stretched between each diamond opening.
The gauge or original thickness of the base metal plate before expanding.
Balancing airflow, visibility, and strength
Select your primary design intent to view typical mesh parameters and open area target ranges.
Minimizes backpressure in HVAC louvers, radiator grilles, and compressor housing screens.
Recommended for electrical equipment enclosures and conveyor safety guards.
Strands angled at 45 degrees block direct overhead sun while permitting horizontal sightlines.
2. Strand width & thickness: engineering strength vs. weight
Because expanded metal is manufactured without welds or joint bonds, strand thickness and width determine how load distributes across the continuous diamond pattern.
Strand thickness corresponds to the original sheet gauge. Increasing thickness by 25% delivers up to a 90% increase in perpendicular point-load resistance before visible deflection.
The feed progression of the expanding knife dictates strand width. A wider strand increases overall sheet weight and creates broader structural bridges across the bond points.
3. Standard (raised) vs. flattened profiles
Choosing between standard (as-expanded) and flattened profiles affects surface texture, directional rigidity, framing tolerances, and friction coefficients.
| Engineering criteria | Standard (raised) profile | Flattened (cold-rolled) profile | Optimal application |
|---|---|---|---|
| Surface geometry | Raised knuckle angles creating a 3D textured plane | Cold-rolled completely smooth and level in a single plane | Standard: Grip and structural deflection resistanceFlattened: Safe contact, sliding items, and flush framing |
| Overall sheet thickness | 1.5x to 2.5x the original raw sheet gauge | Equivalent to or slightly thinner than base material gauge | Standard: Rigidity and high load-bearing without framingFlattened: Tight tolerances, sliding tracks, and enclosures |
| Slip resistance | High multi-directional traction (ideal for catwalks & ramps) | Low friction, tactile-friendly for hand contact | Standard: Industrial walkways, stairs, and vehicle rampsFlattened: Cabinetry, partitions, animal cages, and drying trays |
| Airflow & light diffusion | Directional deflection depending on sightline angle | Direct orthogonal pass-through of light and air | Standard: Sunshades, privacy louvers, and equipment bafflesFlattened: HVAC grilles, ventilation covers, and filtration |
Need detailed load tables for standard or flattened sheet profiles? Explore our dedicated product catalogs.
4. Material selection & environmental compatibility
Material selection depends on operational environment, exposure to corrosive chemistries, structural weight limits, and post-fabrication finish requirements.
Requires post-finish (mill, primed, powder coated, or hot-dip galvanized)
High tensile and yield performance for structural framing
Heavy-duty security barriers, mezzanine decking, and concrete reinforcement
Exceptional resistance to chemical washdown, saltwater, and acid exposure
Superior high-temperature strength and extreme fatigue threshold
Food processing baskets, chemical wash screens, coastal facade panels
Naturally forms protective oxide; highly compatible with architectural anodizing
Roughly 1/3 the weight of steel with excellent formability
Architectural sunscreens, ceiling panels, lightweight machine guards
Pre-galvanized or hot-dip post-expansion for outdoor longevity
Economical high-strength structural base with continuous zinc protection
Outdoor security perimeter fencing, highway trash screens, HVAC cages
Ready to specify expanded metal for your project?
Send your opening dimensions, span requirements, and preferred alloy to our engineering team for custom shearing, flattening, and load calculations.
Ready to specify metal for your next project?
Compare expanded metal patterns or send your project specifications directly to our engineering team for a fast, custom quote.