RHS 80x40x7.1 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 80x40x7.1 steel profile weighs 10.8 kg/m (7.24 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 1,372.543 mm². Moment of inertia Ix = 90.067 cm⁴, Iy = 28.787 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	80 mm	3.15 in
Width (b)	40 mm	1.57 in
Thickness (t)	7.1 mm	0.28 in
Fillet radius (r)	14.2 mm	0.56 in
Weight	10.8 kg/m	7.24 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,372.54 mm²	2.127 in²
Moment of inertia (Ix)	90.07 cm⁴	2.16 in⁴
Moment of inertia (Iy)	28.79 cm⁴	0.69 in⁴
Elastic section modulus (Sx)	22.52 cm³	1.374 in³
Elastic section modulus (Sy)	14.39 cm³	0.878 in³
Plastic section modulus (Zx)	31.05 cm³	1.895 in³
Plastic section modulus (Zy)	18.63 cm³	1.137 in³
Radius of gyration (rx)	2.56 cm	1.009 in
Radius of gyration (ry)	1.45 cm	0.570 in