40 x 40 x 3 EA

Equal Angle · AS/NZS 3679.1 · Australia / New Zealand

40 x 40 x 3 EA is an equal angle with 40 × 40 mm legs, 3.0 mm thick, weighing 1.8 kg/m. The dimensions below are the published AS/NZS 3679.1 values; the drawing is generated from them.

Equal Angles serve as bracing, cleats and lintels. An unrestrained angle bends about its tilted principal axes, so the published Imin — not Ix — governs its buckling checks.

40 x 40 x 3 EA drawn to scale. Save as SVG DXF

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Published dimensions

Property	Metric	Imperial
Leg length, d	40 mm	1.57 in
Thickness, t	3.0 mm	0.118 in
Mass per metre	1.8 kg/m	1.2 lb/ft
Area, A	233 mm²	0.36 in²
Second moment, Ix	34,350 mm⁴	0.1 in⁴
Second moment, Iy	34,350 mm⁴	0.1 in⁴
Principal maximum, I_max	54,500 mm⁴	0.1 in⁴
Principal minimum, I_min	14,200 mm⁴	0.0 in⁴

Derived section properties

Integrated from the section's own outline including the root and toe radii, whose arcs are integrated analytically rather than approximated by facets. For 40 x 40 x 3 EA the computed area agrees with the published value to 0.21% and I_x to 0.07%. Where a value is also published, the published one above is the one to quote.

Property	Value
Elastic modulus, Z_x	1,177 mm³
Elastic modulus, Z_y	1,177 mm³
Plastic modulus, S_x	2,168 mm³
Plastic modulus, S_y	2,168 mm³
Radius of gyration, rx	12.2 mm
Radius of gyration, ry	12.2 mm
Principal maximum, I_max (derived)	54,515 mm⁴
Principal minimum, I_min (derived)	14,231 mm⁴
Principal axis angle, θ_p	45.0°

Z is the elastic modulus and S the plastic modulus, following AS 4100. Under AISC 360 the letters are reversed.

Neighbouring sizes

Lighter25 x 25 x 5 EA1.7 kg/m Heavier30 x 30 x 5 EA2.0 kg/m

Where these numbers come from

Published AS/NZS 3679.1 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API