Introduction
Expanded metal is widely used in walkways, fencing, machine guards, architectural facades, and industrial platforms. Unlike woven or welded mesh, expanded metal is produced by simultaneously slitting and stretching a metal sheet, creating a strong, lightweight structure.
To specify expanded metal correctly, buyers must understand several key dimensions.
Understanding Expanded Metal Terminology
The four most important dimensions are:
- SWD
- LWD
- Strand Width
- Thickness
SWD (Short Way of Diamond)
SWD is the distance between the shortest points of the diamond opening.
It determines:
- Opening size
- Rigidity
- Visibility
LWD (Long Way of Diamond)
LWD is the distance between the longest points of the diamond opening.
It affects:
- Sheet appearance
- Load distribution
- Structural performance
Strand Width
Strand width refers to the solid metal section between openings.
Larger strand widths provide:
- Greater strength
- Improved durability
- Better load capacity
Thickness
Thickness refers to the original sheet thickness before expansion.
Typical range:
| Type | Thickness |
|---|---|
| Light Expanded Metal | 0.5–2 mm |
| Medium Expanded Metal | 2–4 mm |
| Heavy Expanded Metal | 4–8 mm |
Expanded Metal Dimension Diagram
| Dimension | Meaning |
|---|---|
| SWD | Short Way Diamond |
| LWD | Long Way Diamond |
| Strand Width | Width of metal bridge |
| Thickness | Base sheet thickness |
Standard Expanded Metal Sizes
| SWD | LWD | Thickness |
|---|---|---|
| 12 mm | 25 mm | 1.2 mm |
| 20 mm | 40 mm | 1.5 mm |
| 30 mm | 60 mm | 2.0 mm |
| 40 mm | 80 mm | 3.0 mm |
| 50 mm | 100 mm | 4.0 mm |
Open Area and Weight
Smaller diamonds:
- Lower open area
- Higher strength
Larger diamonds:
- Higher open area
- Lower weight
Typical Applications
| Application | Recommended Size |
|---|---|
| Walkways | Heavy Expanded Metal |
| Security Fence | Medium Expanded Metal |
| Machine Guards | Light Expanded Metal |
| Architectural Cladding | Decorative Expanded Metal |
| Ventilation Screens | High Open Area Mesh |
How to Specify Expanded Metal
Example:
Material: Carbon Steel
Thickness: 2.0 mm
SWD: 20 mm
LWD: 40 mm
Strand Width: 3 mm
Sheet Size: 1220 × 2440 mm
Conclusion
Understanding SWD, LWD, strand width, and thickness allows buyers to accurately specify expanded metal products and avoid costly procurement errors.
