What are the standard wire diameters for barbed wire fencing?

The standard line wire diameters are 2.24 mm and 2.50 mm. The corresponding point wire (barb) diameters are 2.00 mm and 2.24 mm.

What is the acceptable spacing between barbs?

The standard specifies nominal distances of either 75 mm (with a tolerance of ± 12 mm) or 150 mm (with a tolerance of ± 15 mm).

What is the required tensile strength for the line wire?

The tensile strength of the line wire must be between 390 MPa and 590 MPa to ensure adequate tensioning without breaking.

How is the corrosion resistance of the barbed wire ensured?

The standard mandates that both line and point wires be heavily hot-dip galvanized according to IS 4826 before they are stranded and barbed.

IS 278

: 1985

Galvanized Steel Barbed Wire for Fencing - Specification

CurrentFrequently UsedSpecificationMaterials Science · Fencing, Gates and Barriers

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This standard covers the manufacturing, dimensional, and testing requirements for galvanized steel barbed wire used for fencing. It specifies acceptable wire diameters, barb spacing, tensile strength to prevent sagging, and galvanizing standards to ensure corrosion resistance.

Specifies requirements for galvanized steel barbed wire for fencing purposes.

Quick Reference Values

standard line wire diameter2.24 mm or 2.50 mm

standard point wire diameter2.00 mm or 2.24 mm

distance between barbs75 mm or 150 mm

barb spacing tolerance 75mm± 12 mm

barb spacing tolerance 150mm± 15 mm

tensile strength line wire390 to 590 MPa (N/mm²)

number of points per barb4 points

Practical Notes

Always verify the mass of the zinc coating against IS 4826, as poor galvanizing is the most common cause of premature fence failure, especially in coastal or humid environments.

Ensure the tensile strength of the line wire is tested; wire that is too soft will sag between posts, while wire that is too brittle may break during installation.

When procuring, clearly specify the required distance between barbs (75mm or 150mm) based on the security level required for the boundary.