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IS 278:1985 is the Indian Standard (BIS) for galvanized steel barbed wire for fencing - specification. 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.
! 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.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
galvanized steelbarbed wirezinc coatingmild steel
International Equivalents
Similar International Standards
ASTM A121-19ASTM International (US)
HighCurrent
Standard Specification for Metallic-Coated Carbon Steel Barbed Wire
Specifies materials, dimensions, coating classes, and construction of steel barbed wire.
BS EN 10223-1:2012BSI (UK) / CEN (Europe)
HighCurrent
Steel wire and wire products for fencing and netting - Part 1: Zinc and zinc-alloy coated steel barbed wire
Defines requirements for zinc or zinc-alloy coated steel barbed wire, including material properties and dimensions.
AS 2423:2002Standards Australia (AU)
MediumCurrent
Galvanized steel wire fencing products
Covers a range of galvanized fencing products, with a specific section on barbed wire requirements.
Key Differences
≠IS 278 specifies a single tensile strength range for mild steel (350-550 MPa), whereas standards like BS EN 10223-1 offer specifications for both mild steel and high-tensile wire (often 700-950 MPa), providing stronger fencing options.
≠IS 278 defines coating durability using descriptive terms like 'Lightly coated' and 'Heavily coated'. International standards use a more granular 'Class' system (e.g., ASTM A121's Class 1, Class 3; BS EN's Class A, B) that directly maps to minimum coating mass.
≠Standard barb spacing in IS 278 is 75 mm or 100 mm. ASTM A121 commonly specifies wider spacing options of 4 inches (102 mm) or 5 inches (127 mm).
≠IS 278 exclusively specifies 4-point barbs. ASTM A121, while commonly using 4-point barbs, explicitly permits 2-point barbs as an alternative configuration.
Key Similarities
≈All standards are based on a fundamental construction of two twisted line (strand) wires with pointed barbs attached at regular intervals.
≈The primary measure for corrosion resistance across all standards is the mass of zinc coating per unit area (g/m² or oz/ft²), even if the terminology or classification differs.
≈The 'Iowa' pattern, which uses a reverse twist for the two line wires to lock the barb in place, is a common and recognized manufacturing method in IS 278 and its international counterparts.
≈All specifications provide defined nominal diameters and acceptable tolerances for both line and point (barb) wires to ensure product consistency.
Parameter Comparison
Parameter
IS Value
International
Source
Tensile Strength (Line Wire)
350 - 550 MPa
700 - 950 MPa (for high tensile wire)
BS EN 10223-1:2012
Min. Zinc Coating (Heavy Coat, ~2.5mm wire)
245 g/m² (for 'Heavily coated' on 2.50 mm wire)
244 g/m² (0.80 oz/ft² for Class 3, 12-1/2 gauge wire)
ASTM A121-19
Standard Barb Spacing
75 mm or 100 mm
4 in (102 mm) or 5 in (127 mm)
ASTM A121-19
Number of Barb Points
4 points
4 points (standard); 2 points (permitted)
ASTM A121-19
Coating Classification System
Lightly coated, Heavily coated
Class A, Class B (as per EN 10244-2)
BS EN 10223-1:2012
Typical Line Wire Diameters
2.50 mm, 2.24 mm, 2.00 mm
2.50 mm (12.5 gauge), 2.00 mm (14 gauge)
BS EN 10223-1:2012
⚠ Verify details from original standards before use
Key Values7
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
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions of Galvanized Steel Barbed Wire