Galvanized Steel Wire

Stay Wire & Earth Wire

Galvanized steel wire strands engineered for sustaining mechanical loads in power transmission infrastructure. Seven-wire helical construction — six wires stranded around a central core — manufactured to WAPDA Specification P-12-80, used to stay power poles and tower structures across Pakistan and beyond.

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Product Overview

Stay wires are galvanized steel wire strands used for sustaining mechanical loads. They are made by twisting seven wires together — six wires stranded around one central wire. A common use is in the electricity industry, to stay power poles and tower structures.

Technical Specifications

Construction 7-wire strand — 6 wires helically stranded around 1 central wire
Material High-tensile galvanized steel wire
Size Range 2.50 mm to 4.00 mm diameter (single wire)
Strand Range 6 mm, 9 mm, 10 mm, 12 mm (stranded wire nominal)
Coating Zinc coated — three grades:
Light Medium Heavy
Tensile Strength 58.4 kgs/sq. mm to 180 kgs/sq. mm
Specification IS:214 I :2002 & WAPDA Spec. P-12-80
Breaking Load 1,570 kg (6 mm) up to 10,300 kg (12 mm stranded)
Coil / Reel Weight 50 kg to 650 kg depending on strand size

Structure & Supply Details

4 mm Solid Wire 1 wire · 4.00 mm nominal · Min elongation 7.5% in 250 mm · Breaking load 897 kg
6 mm Strand 7 wires · 2.00 mm nominal · Min elongation 10% in 600 mm · Breaking load 1,570 kg · Nominal weight 173 kg/km
9 mm Strand 7 wires · 3.00 mm nominal · Min elongation 6% in 600 mm · Breaking load 5,050 kg · Nominal weight 389 kg/km
10 mm Strand 7 wires · 3.25 mm nominal · Min elongation 10% in 600 mm · Breaking load 4,150 kg · Nominal weight 457 kg/km
12 mm Strand 7 wires · 4.00 mm nominal · Min elongation 4% in 600 mm · Breaking load 10,300 kg · Nominal weight 692 kg/km
Lay Length Min. 72 mm – Max. 216 mm (varies by strand diameter)
Custom Supply All sizes produced per customer specifications and project requirements

WAPDA Specification P-12-80

Galvanized Steel Wires — dimension and mechanical property parameters per WAPDA P-12-80 standard

Galvanized Steel Wires by Nominal Diameter

Single wire and stranded wire mechanical properties as per WAPDA Specification P-12-80

Nominal Diameter
of Single Wire
(mm)		 Single Wire Stranded Wire Nominal
Weight
(kg/km)		 Weight of
Wire in
Coil / Reel
(kg)
Standard
Dard
(mm)		 Min
Diam.
(mm)		 Max
Diam.
(mm)		 Min Elong.
in 250 mm
(%)		 Min Breaking
Load
(kg)		 Min Elong.
in 600 mm
(%)		 Min Breaking
Load
(kg)		 Length of Lay
Min
(mm)		 Max
(mm)
4.00
Solid		 4.00 3.90 4.10 7.5 897 — — — — 98 50
2.00
6 mm strand		 2.00 1.94 2.06 — — 10 1,570 72 108 173 50
3.00
9 mm strand		 3.00 2.92 3.08 — — 6 5,050 108 162 389 650
3.25
10 mm strand		 3.25 3.17 3.33 — — 10 4,150 117 175 457 100
4.00
12 mm strand		 4.00 3.90 4.10 — — 4 10,300 144 216 692 150

Full Designation Parameters (WAPDA P-12-80)

Complete designation-based parameter table for galvanized steel wire strands

Designation Number
of Wires		 Nominal
Diameter
of Single
Wire (mm)		 Single Wire Stranded Wire Nominal
Weight
(kg/km)		 Weight of
Wire in
Coil / Reel
(kg)
Stand.
Dard
(mm)		 Min
(mm)		 Max
(mm)		 Min Elong.
in 250 mm
(%)		 Min Break.
Load (kg)		 Min Elong.
in 600 mm
(%)		 Min Break.
Load (kg)		 Length of Lay
Min (mm) Max (mm)
4 mm solid 1 4.00 4.00 3.90 4.10 7.5 897 — — — — 98 50
6 mm strand 7 2.00 2.00 1.94 2.06 — — 10 1,570 72 108 173 50
9 mm strand 7 3.00 3.00 2.92 3.08 — — 6 5,050 108 162 389 650
10 mm strand 7 3.25 3.25 3.17 3.33 — — 10 4,150 117 175 457 100
12 mm strand 7 4.00 4.00 3.90 4.10 — — 4 10,300 144 216 692 150

Quick Reference: Breaking Load & Weight

At-a-glance summary of key parameters for each strand type

Strand Type No. of Wires Single Wire Dia. (mm) Min Breaking Load (kg) Nominal Weight (kg/km) Coil / Reel Weight (kg)
4 mm solid 1 4.00 897 (single) 98 50
6 mm strand 7 2.00 1,570 173 50
9 mm strand 7 3.00 5,050 389 650
10 mm strand 7 3.25 4,150 457 100
12 mm strand 7 4.00 10,300 692 150
All products manufactured and tested per WAPDA Specification P-12-80 and IS:214 I :2002. Custom sizes and coil weights available on request.

Key Features

Why AL-TECH Stay Wire & Earth Wire is the preferred choice for power transmission infrastructure

Heavy Zinc Galvanizing

Three coating grades — light, medium, and heavy — providing robust corrosion protection for outdoor and coastal environments.

High Breaking Load

Minimum breaking loads from 1,570 kg (6 mm) to 10,300 kg (12 mm strand) for demanding structural loading conditions.

Seven-Wire Construction

Six wires helically stranded around one central wire — delivering superior flexibility, torsional strength, and load distribution.

WAPDA P-12-80 Compliant

Manufactured and tested strictly to WAPDA Specification P-12-80 and IS:214 I :2002, ensuring full compliance for utility projects.

Applications

Stay Wire and Earth Wire is widely deployed across power transmission, telecommunications, and civil infrastructure

Power Transmission

Staying power poles and tower structures in high-voltage transmission and distribution lines

Electricity Industry

Supporting utility poles, substations, and overhead line infrastructure across WAPDA distribution networks

Telecommunications

Guy wires for telecom towers, antenna masts, and communication infrastructure requiring mechanical stay support

Earth / Ground Wire

9 mm, 10 mm and 12 mm galvanized wire strands used as earth wire on overhead transmission lines

Applicable Standards

Stay Wire and Earth Wire manufactured and tested in compliance with the following specifications

WAPDA P-12-80
Water and Power Development Authority Specification for Galvanized Steel Wires — Pakistan's primary utility standard
IS:214 I :2002
Indian Standard for Stay Wires for Overhead Power & Telecommunication Lines (Part I)
Zinc Coating
Light, Medium & Heavy zinc coating grades conforming to galvanizing requirements for corrosion protection