Welded Wire Mesh Specifications: What to Put in Your RFQ

A specification for welded wire meshs is only useful if it is unambiguous to someone who cannot see your project. Most disputes on this product do not come from bad manufacturing — they come from a drawing that could reasonably be read two ways, where the supplier read it the cheap way and the buyer read it the expensive way.

This is a practical specification checklist, written around what the standards actually require.

The three specification families you will meet

Suppliers will quote against whichever family your market uses, and the part can usually be built to any of them:

• ASTM A1064 / A1064M — Steel wire and welded wire reinforcement, plain and deformed, for concrete.
• ASTM A185 — Older specification for welded steel wire fabric for concrete.
• EN 10223-4 — Steel wire mesh fencing for agricultural and general use.
• BS 4483 — UK specification for steel fabric for the reinforcement of concrete.
• EN ISO 1461 — Hot-dip galvanised coatings on fabricated iron and steel articles.

The mistake is to specify a standard reference without specifying the class or grade within it. If you write only the standard number, the supplier will quote the lowest class that satisfies it. Write the standard and the level you want.

Dimensional data that has to be on the drawing

For this product the critical dimensions are: mesh opening 6–150 mm (1/4 in to 6 in), wire diameter 0.5–5.0 mm, panel 1×2 m to 2.4×6 m; rolls and rigid panels both supplied.

Three rules that prevent most dimensional disputes:

1. Give tolerances on every functional dimension, not just the nominal values. A nominal dimension with no tolerance is legally “as the supplier chooses”.
2. Say which dimensions are functional and which are cosmetic. Suppliers prioritise what you prioritise, and they cannot guess.
3. State the gauge or measuring method where a dimension is critical. Two inspectors with different methods will disagree about the same part.

Material and grade

The base specification is low-carbon steel wire (Q195 / Q235), stainless steel wire (AISI 304 / 316) and galvanised wire. Grades commonly offered include:

• Q195 low-carbon steel wire
• Q235 low-carbon steel wire
• AISI 304 stainless wire
• AISI 316 stainless wire
• G60 hot-dip galvanised coating
• G90 hot-dip galvanised coating

Ask the supplier to state the grade on the quotation, not on an assumption. Grade substitution is the single most common silent cost reduction, and it is usually invisible in the finished part — a 201 stainless component looks exactly like a 304 one until the second winter.

Surface treatment

The usual finish for this product is electro-galvanised, hot-dip galvanised (G60 / G90) or PVC-coated over galvanised; stainless supplied plain or passivated.

Two points worth writing into the order:

• A measured requirement, not a process name. “Hot-dip galvanised” is a process; “70 µm minimum, tested by coating mass on three parts per batch” is a requirement.
• What happens at cut edges and drilled holes, if any. These are where coatings are habitually broken and where corrosion starts.

Type tests and routine tests

These are different things and are frequently confused in quotations:

• Type tests qualify the design once. On this product: wire tensile strength; weld shear / peel strength; coating mass per unit area.
• Routine tests are run on every batch: mesh opening and wire-diameter tolerance; panel flatness and squareness.

Specify which type-test reports you want supplied as documents, and which routine test results must accompany each shipment. On a first order, ask for the type-test report before you place it.

The failure modes your specification should be closing

• Weak weld that opens under load — weld current or pressure out of range — the joint holds hand tension but shears when the panel is stretched in service
• Uneven or patchy zinc coating — poor surface preparation before galvanising, or wire already rusted at the weld; rust starts at the weld node
• Wrong opening supplied — the line was set for a different specification and the tolerance was not checked against the order

Each of these can be turned into one line in the specification. That is the real purpose of writing it out: not bureaucracy, but making the specific failure you are worried about somebody’s explicit responsibility.

A specification skeleton you can reuse

1. Scope: Welded Wire Mesh to be supplied as welded wire mesh, welded mesh panel, concrete reinforcing mesh, cage mesh.
2. Dimensions and tolerances: mesh opening 6–150 mm (1/4 in to 6 in), wire diameter 0.5–5.0 mm, panel 1×2 m to 2.4×6 m; rolls and rigid panels both supplied.
3. Material: low-carbon steel wire (Q195 / Q235), stainless steel wire (AISI 304 / 316) and galvanised wire; grade Q195 low-carbon steel wire or better.
4. Standard: ASTM A1064 / A1064M — Steel wire and welded wire reinforcement, plain and deformed, for concrete; ASTM A185 — Older specification for welded steel wire fabric for concrete; EN 10223-4 — Steel wire mesh fencing for agricultural and general use; BS 4483 — UK specification for steel fabric for the reinforcement of concrete; EN ISO 1461 — Hot-dip galvanised coatings on fabricated iron and steel articles.
5. Finish: electro-galvanised, hot-dip galvanised (G60 / G90) or PVC-coated over galvanised; stainless supplied plain or passivated.
6. Tests: wire tensile strength; weld shear / peel strength; coating mass per unit area; mesh opening and wire-diameter tolerance; panel flatness and squareness.
7. Marking and packing: panels strapped in bundles on wooden pallets with edge protection; rolls wrapped in anti-rust paper and woven fabric.
8. Inspection: pre-shipment, against this specification, with photo evidence and test records.

Related: the welded wire mesh quality inspection checklist turns this specification into an inspection plan you can hand to a third-party inspector.