How to Measure Expanded Metal Mesh
Learn how to measure SWD, LWD, SWO, LWO, material thickness and strand width using a digital caliper. This guide demonstrates all six measurements on one real expanded metal sample.
Expanded Metal Sample: Measurement Results
Values shown are actual caliper readings from the sample, not guaranteed nominal manufacturing dimensions.
How to Measure Expanded Metal: 6 Steps
1. How to Measure SWD
SWD: 25.37 mm
Measure the short-way pitch between corresponding bond centers using a digital caliper.
2. How to Measure LWD
LWD: 60.15 mm
Measure the long-way pitch between corresponding bond centers along the long direction of the diamond.
3. How to Measure SWO
SWO: 18.36 mm
Measure the clear opening across the short direction, from one inside strand edge to the opposite inside edge.
4. How to Measure LWO
LWO: 45.29 mm
Measure the clear opening across the long direction, between the inside edges of the strands.
5. How to Measure Material Thickness
Material thickness: 4.23 mm
Measure the sheet thickness using a digital caliper.
6. How to Measure Strand Width
Strand width: 4.53 mm
Measure the width across a single strand, perpendicular to its length.
SWD vs. LWD vs. SWO vs. LWO
SWD and LWD are pitch dimensions under the bond-center convention used in this guide. SWO and LWO are the clear openings. The two sets of dimensions are not interchangeable.
- SWD / LWD
- Short-way / long-way bond-center pitch, following the stated drawing convention.
- SWO / LWO
- Short-way / long-way clear opening, inside edge to inside edge.
- Strand width
- Width across a metal strand, perpendicular to its length and away from the bond.
- Material thickness
- Sheet thickness measured across a strand.
Technical details: sheet dimensions diagram
Drawing conventions and standards
Notation varies: Central Expanded Metal's technical tables separate design size from opening size; the UK Expanded Metal Company measuring guide uses SWP/LWP for raised-mesh pitch and SWA/LWA for flattened-mesh aperture. These are supplier conventions, not universal national definitions.
Where specified, consult the applicable edition of ASTM F1267 (Metal, Expanded, Steel) or BS 405:1987. Agree on the drawing revision, endpoints, units, material scope and tolerances before manufacture or inspection. These references do not establish product certification.
Measure several complete pitch repeats and divide by the number of repeats where practical. Avoid damaged edges, check representative positions and record the inspection condition. Do not derive clear openings by subtracting strand width with a universal shortcut.
Common Expanded Metal Measurement Mistakes
- Confusing bond-center pitch with the clear opening.
- Measuring the wrong diamond direction: label the short and long ways.
- Confusing material thickness with overall raised mesh height.
- Leaving out strand width, profile, material grade or coating condition.
- Omitting the measurement endpoints, units or drawing revision.
- Forgetting sheet size, diamond orientation, cut edges and agreed tolerances.
Expanded Metal Measurement FAQ
What is SWD in expanded metal mesh?
SWD means Short Way of Diamond or Design. In this guide it is the short-way bond-center pitch. Confirm the measurement endpoints on the specified drawing.
What is LWD in expanded metal mesh?
LWD means Long Way of Diamond or Design. Here it is the long-way bond-center pitch, rather than the clear opening.
What is the difference between pitch and clear opening?
Pitch is measured between corresponding bond centers under the convention used here. Clear opening is the unobstructed inside-edge distance: SWO in the short direction and LWO in the long direction.
How do you measure expanded metal strand width?
Measure across one strand, perpendicular to its length and away from the wider bond. Record the units and finished condition.
How do you measure expanded metal thickness?
Measure the sheet thickness using a digital caliper.
Do UK and US expanded metal specifications use the same terminology?
Not always. Some guides use SWP/LWP for pitch or SWA/LWA for aperture. Follow the referenced standard, edition and dimensioned drawing, rather than the abbreviation or country alone.
What measurements should buyers provide for quotation?
Send material and grade, raised or flattened profile, SWD/LWD with defined endpoints, required clear openings, strand width, sheet thickness, sheet size and diamond direction. Include finish, quantity, destination and the drawing or sample reference; confirm tolerances and inspection condition before ordering.
Related Resources and Quotation Checklist
- Expanded metal products
- Expanded metal weight and open area calculator
- Raised expanded metal and flattened expanded metal
- Sheet size, edges and tolerances
- Mesh openings and open area
Calculator results are theoretical estimates, not certified measurements or service performance.
What to include with your drawing or quotation request
| Material and grade | Carbon steel, galvanized steel, aluminum, stainless steel, copper, titanium or the specified alloy. |
|---|---|
| Surface profile | Raised / standard or flattened; identify the finished condition. |
| Standard and drawing | Standard number and edition, drawing number and revision, measurement endpoints, units and agreed tolerances. Resolve conflicting definitions before ordering. |
| SWD × LWD | State the measurement basis from the standard or drawing. For this guide and calculator, use short-way and long-way bond-center pitches. |
| SWO × LWO | Short-way and long-way clear openings, where required; keep separate from pitch. |
| Strand width | Width across one strand, away from the bond, in mm. |
| Material thickness | Starting-sheet thickness before expansion. If finished-strand thickness is required, specify it as a separate value and state the inspection condition. |
| Overall thickness | Total finished mesh height / depth between its outermost surfaces; specify separately from starting-sheet or finished-strand thickness. |
| Sheet dimensions | Overall width × length, with diamond direction, cut edges and tolerances. |
| Surface finish | Mill finish, galvanized, anodized, powder coated or another agreed treatment. |
| Order details | Quantity, application, drawing or sample reference, and delivery destination. |
Need Custom Expanded Metal?
Send us your required mesh dimensions, material, thickness and quantity for a custom quotation.
Request a quotation