RHS 80x40x3 · Weight & Dimensions

EN — 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 80x40 cal 11 (México) · Caño estructural 80x40 (Argentina)

The RHS 80x40x3 steel profile weighs 5.2 kg/m (3.49 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 684 mm². Moment of inertia Ix = 55.85 cm⁴, Iy = 18.43 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3 mm ≈ 11 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	80 mm	3.15 in
Width (b)	40 mm	1.57 in
Thickness (t)	3 mm	0.12 in
Fillet radius (r)	6 mm	0.24 in
Weight	5.2 kg/m	3.49 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	684 mm²	1.060 in²
Moment of inertia (Ix)	55.85 cm⁴	1.34 in⁴
Moment of inertia (Iy)	18.43 cm⁴	0.44 in⁴
Elastic section modulus (Sx)	13.96 cm³	0.852 in³
Elastic section modulus (Sy)	9.21 cm³	0.562 in³
Plastic section modulus (Zx)	17.45 cm³	1.065 in³
Plastic section modulus (Zy)	10.61 cm³	0.647 in³
Radius of gyration (rx)	2.86 cm	1.126 in
Radius of gyration (ry)	1.64 cm	0.646 in