RHS 80x40x5.2 Açotubo · Weight & Dimensions

Açotubo, cold-formed sections · 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 (México) · Caño estructural 80x40 (Argentina)

The RHS 80x40x5.2 steel profile weighs 8.4 kg/m (5.64 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 1,070.206 mm². Moment of inertia Ix = 76.916 cm⁴, Iy = 25.122 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 5.2 mm ≈ 6 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	80 mm	3.15 in
Width (b)	40 mm	1.57 in
Thickness (t)	5.2 mm	0.20 in
Fillet radius (r)	10.4 mm	0.41 in
Weight	8.4 kg/m	5.64 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,070.21 mm²	1.659 in²
Moment of inertia (Ix)	76.92 cm⁴	1.85 in⁴
Moment of inertia (Iy)	25.12 cm⁴	0.60 in⁴
Elastic section modulus (Sx)	19.23 cm³	1.173 in³
Elastic section modulus (Sy)	12.56 cm³	0.767 in³
Plastic section modulus (Zx)	25.44 cm³	1.552 in³
Plastic section modulus (Zy)	15.43 cm³	0.942 in³
Radius of gyration (rx)	2.68 cm	1.055 in
Radius of gyration (ry)	1.53 cm	0.603 in