ASTM A740 covers the requirements for welded wire mesh panels. Reproduced below: the complete specification table, the tolerance classes, and the companion and equivalent standards referenced when ordering to this document.
ASTM A740 — Scope
ASTM A740 specifies the designation system, dimensions and tolerances of welded wire mesh panels — mesh count or nominal opening, wire diameter and the permissible aperture deviations. Alloy chemistry, mechanical testing and delivery condition are governed by separate documents in the same standards family.
Tolerance Classes
ASTM A740 defines tolerance limits on the average aperture and on the maximum single aperture, tightening as the aperture gets finer. For test-sieve duty the tighter ISO 3310-1 tolerances apply instead of the general cloth tolerances — specify sieve grade explicitly if the mesh will be used for particle-size analysis.
Specifications Defined by ASTM A740
| Opening (mm) | Wire diameter (mm) | Format | Standard size | Reference standard |
|---|---|---|---|---|
| 12.7x12.7 | 1.6 | Panel / roll | 1.0 x 2.0 m | EN 10223-7 |
| 25.4x25.4 | 2.0 | Panel / roll | 1.0 x 2.0 m | EN 10223-7 |
| 50.8x50.8 | 2.5 | Panel | 1.2 x 2.4 m | EN 10223-7 |
| 50x50 | 4.0 | Panel | 2.0 x 3.0 m | EN 10223-7 |
| 75x75 | 5.0 | Panel | 2.0 x 3.0 m | EN 10223-7 |
| 100x100 | 6.0 | Panel | 2.0 x 6.0 m | EN 10223-7 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ ASTM ↔ DIN), they are listed on the parent Welded Wire Mesh Panels page. Confirm against the specification table on this page — nominally equivalent documents can differ in tolerance limits.
When to Specify ASTM A740
ASTM A740 is the US-market reference; for metric programs pair it with the ISO designation so both markets read the order identically.
Specifying Welded Wire Mesh Panels Beyond the Standard
- Opening & wire: Square or rectangular opening and wire gauge sized for load and containment.
- Panel size: Standard 4 × 8 ft or cut to drawing with trimmed or selvedge edges.
- Finish: Stainless 304/316, galvanized after welding, or powder coated.
When Welded Wire Mesh Panels Is Not the Right Choice
Not a filtration or sieving medium — welded grids are for containment and support.
