Welded Wire Mesh Rolls manufactured to ASTM A740 follows the specification table reproduced on this page. The standard fixes geometry and tolerances; alloy chemistry and testing are assigned by their own companion documents.
ASTM A740 — Scope
ASTM A740 specifies the designation system, dimensions and tolerances of welded wire mesh rolls — 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 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ ASTM ↔ DIN), they are listed on the parent Welded Wire Mesh Rolls 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.