RHS 180x80x4 · Weight & Dimensions

BR — Rectangular Hollow Section

Rectangular Hollow Sections (RHS) are tubular profiles with excellent torsional resistance and aesthetic appeal. Used for columns, trusses, and exposed structural elements.

Also known as: PTR 180x80 cal 8 (México) · Caño estructural 180x80 (Argentina)

The RHS 180x80x4 steel profile weighs 15.3 kg/m (10.28 lb/ft), has a depth of 180 mm (7.09 in), flange width 80 mm (3.15 in). Cross-sectional area: 2,016 mm². Moment of inertia Ix = 834.93 cm⁴, Iy = 233.01 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 4 mm ≈ 8 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	180 mm	7.09 in
Width (b)	80 mm	3.15 in
Thickness (t)	4 mm	0.16 in
Fillet radius (r)	8 mm	0.31 in
Weight	15.3 kg/m	10.28 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	2,016 mm²	3.125 in²
Moment of inertia (Ix)	834.93 cm⁴	20.06 in⁴
Moment of inertia (Iy)	233.01 cm⁴	5.60 in⁴
Elastic section modulus (Sx)	92.77 cm³	5.661 in³
Elastic section modulus (Sy)	58.25 cm³	3.555 in³
Plastic section modulus (Zx)	115.49 cm³	7.048 in³
Plastic section modulus (Zy)	65.09 cm³	3.972 in³
Radius of gyration (rx)	6.44 cm	2.535 in
Radius of gyration (ry)	3.4 cm	1.339 in