Chain Link Fence Specifications: What to Put in Your RFQ

A specification for chain link fences 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 A392 — Zinc-coated steel chain-link fence fabric.
• ASTM F668 — Polyester-coated steel chain-link fence fabric.
• ASTM A817 — Metallic-coated steel chain-link fence framework (posts, rails, fittings).
• EN ISO 1461 — Hot-dip galvanised coatings on fabricated 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 25–100 mm (1 in to 4 in diamond), wire 1.5–4.5 mm, fence height 0.9–3.6 m, roll length 10–30 m.

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), galvanised wire and stainless steel wire. Grades commonly offered include:

• Q195 low-carbon steel wire
• Q235 low-carbon steel wire
• AISI 304 stainless wire
• G60 hot-dip galvanised coating
• G90 hot-dip galvanised coating
• polyester (PVC) coating over galvanised

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 hot-dip galvanised (G60 / G90) or polyester-coated (commonly green or black) over galvanised; stainless supplied plain.

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; coating mass per unit area; diamond uniformity and twist count.
• Routine tests are run on every batch: height and roll-length tolerance; selvage (knuckled or barbed) integrity.

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

• White rust / poor galvanising — the coating mass is below spec or the wire was not properly fluxed; corrosion starts at the diamond crown
• Loose or uneven weave — tension inconsistent across the loom — the fabric waves and will not stretch true on the line
• Sharp or missing selvage — a barbed selvage was specified but not finished, or knuckled ends were cut — a handling and safety hazard

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: Chain Link Fence to be supplied as chain link fence, diamond mesh fencing, cyclone fence, wire netting.
2. Dimensions and tolerances: mesh 25–100 mm (1 in to 4 in diamond), wire 1.5–4.5 mm, fence height 0.9–3.6 m, roll length 10–30 m.
3. Material: low-carbon steel wire (Q195 / Q235), galvanised wire and stainless steel wire; grade Q195 low-carbon steel wire or better.
4. Standard: ASTM A392 — Zinc-coated steel chain-link fence fabric; ASTM F668 — Polyester-coated steel chain-link fence fabric; ASTM A817 — Metallic-coated steel chain-link fence framework (posts, rails, fittings); EN ISO 1461 — Hot-dip galvanised coatings on fabricated articles.
5. Finish: hot-dip galvanised (G60 / G90) or polyester-coated (commonly green or black) over galvanised; stainless supplied plain.
6. Tests: wire tensile strength; coating mass per unit area; diamond uniformity and twist count; height and roll-length tolerance; selvage (knuckled or barbed) integrity.
7. Marking and packing: rolls on cardboard cores, wrapped in woven fabric; posts and fittings supplied separately, bundled.
8. Inspection: pre-shipment, against this specification, with photo evidence and test records.

Related: the chain link fence quality inspection checklist turns this specification into an inspection plan you can hand to a third-party inspector.