Fencing Wire Gauge, GSM and Size Chart

Fencing Wire Gauge, GSM and Size Chart

Posted on July 07, 2026

Two numbers decide whether a fence lasts three years or sixty: the wire gauge (thickness) and the zinc coating weight (GSM). This quick-reference chart maps both to fencing applications, using Systematic’s GI wire manufacturing range. For the full technical background, see the GI fencing wire specifications guide.

Wire gauge → application chart

Systematic’s fencing wire spans 0.90 mm to 6.00 mm diameter (SWG 8–20):

SWG	Diameter	Primary fencing use
20–18	0.90–1.20 mm	Poultry mesh, light enclosures, garden barriers
16	1.6–2.0 mm	Chain link (light duty) — residential, parks
14	2.0–2.5 mm	Chain link (standard) — farms, commercial
12	2.5–3.0 mm	Chain link / barbed — agricultural, industrial
10	2.5–3.0 mm	Heavy-duty barbed wire — highways, security
8	4.0–6.0 mm	High-security fencing, welded mesh — industrial

Zinc coating (GSM) → expected life

Zinc coating weight, in grams per square metre, determines how long the wire resists corrosion. Systematic offers 30–366 GSM:

GSM	Classification	Outdoor life	Best for
30–60	Light	3–5 years	Temporary / indoor
60–120	Standard	8–12 years	General outdoor fencing
120–275	Heavy	15–25 years	Permanent farm / agricultural
275–366	Extra-heavy	30–60 years	Coastal, industrial, chemical zones

Standards and process

Fencing wire is hot-dip galvanized (molten zinc at 443–465°C) for a metallurgical zinc bond, conforming to IS 280 (1978) and BS 10223 Part 3, with BIS certification. See how GI wire is made.

How to choose: gauge + GSM by use case

Use case	Gauge	GSM
Residential chain link	16–14	60–120
Farm / agricultural	14–12	120–275
Farm / agricultural (Zinc Aluminium)	8-12	275
Industrial / security	12–8	120–275
Coastal / chemical zone	12–8	275–366
Poultry / light enclosure	20–16	90–300

Specifying a particular product? See chain link fencing, welded wire mesh, the barbed wire guide, or request a quote.

Frequently Asked Questions

What gauge wire is used for chain link fencing?

Most chain link uses 14 gauge (≈2.0 mm) for residential and 12 gauge (≈2.5 mm) for commercial/farm use. Systematic supplies 16–8 gauge for chain link.

What GSM coating should I choose for coastal fencing?

Use extra-heavy 275–366 GSM coating in coastal, industrial or chemical zones for a 30–60 year service life.

What diameter range does fencing wire come in?

Systematic’s fencing wire spans 0.90 mm to 6.00 mm (SWG 20 down to 8), conforming to IS 280 (1978).

What does GSM mean for fencing wire?

GSM (grams per square metre) is the zinc coating weight — the main driver of corrosion life. Higher GSM means longer outdoor service.