RHS 80x40x5.6 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 80x40x5.6 steel profile weighs 8.9 kg/m (6.00 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 1,137.801 mm². Moment of inertia Ix = 80.281 cm⁴, Iy = 26.095 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 5.6 mm ≈ 4 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	80 mm	3.15 in
Width (b)	40 mm	1.57 in
Thickness (t)	5.6 mm	0.22 in
Fillet radius (r)	11.2 mm	0.44 in
Weight	8.9 kg/m	6.00 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,137.8 mm²	1.764 in²
Moment of inertia (Ix)	80.28 cm⁴	1.93 in⁴
Moment of inertia (Iy)	26.09 cm⁴	0.63 in⁴
Elastic section modulus (Sx)	20.07 cm³	1.225 in³
Elastic section modulus (Sy)	13.05 cm³	0.796 in³
Plastic section modulus (Zx)	26.77 cm³	1.634 in³
Plastic section modulus (Zy)	16.2 cm³	0.989 in³
Radius of gyration (rx)	2.66 cm	1.046 in
Radius of gyration (ry)	1.51 cm	0.596 in