55 x 55 x 6 EA

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

55 x 55 x 6 EA is an equal angle with 55 × 55 mm legs, 6.0 mm thick, weighing 4.9 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.

55 x 55 x 6 EA drawn to scale. Save as SVG DXF

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Published dimensions

Property	Metric	Imperial
Leg length, d	55 mm	2.17 in
Thickness, t	6.0 mm	0.236 in
Mass per metre	4.9 kg/m	3.3 lb/ft
Area, A	628 mm²	0.97 in²
Second moment, Ix	175,150 mm⁴	0.4 in⁴
Second moment, Iy	175,150 mm⁴	0.4 in⁴
Principal maximum, I_max	278,000 mm⁴	0.7 in⁴
Principal minimum, I_min	72,300 mm⁴	0.2 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 55 x 55 x 6 EA the computed area agrees with the published value to 0.02% and I_x to 0.15%. Where a value is also published, the published one above is the one to quote.

Property	Value
Elastic modulus, Z_x	4,458 mm³
Elastic modulus, Z_y	4,458 mm³
Plastic modulus, S_x	8,105 mm³
Plastic modulus, S_y	8,105 mm³
Radius of gyration, rx	16.7 mm
Radius of gyration, ry	16.7 mm
Principal maximum, I_max (derived)	277,528 mm⁴
Principal minimum, I_min (derived)	72,259 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

Lighter65 x 65 x 5 EA4.6 kg/m Heavier75 x 75 x 5 EA5.3 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