RHS 70x40x7.1 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 70x40 (México) · Caño estructural 70x40 (Argentina)

The RHS 70x40x7.1 steel profile weighs 9.7 kg/m (6.49 lb/ft), has a depth of 70 mm (2.76 in), flange width 40 mm (1.57 in). Cross-sectional area: 1,230.543 mm². Moment of inertia Ix = 62.326 cm⁴, Iy = 24.885 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	70 mm	2.76 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	9.7 kg/m	6.49 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,230.54 mm²	1.907 in²
Moment of inertia (Ix)	62.33 cm⁴	1.50 in⁴
Moment of inertia (Iy)	24.88 cm⁴	0.60 in⁴
Elastic section modulus (Sx)	17.81 cm³	1.087 in³
Elastic section modulus (Sy)	12.44 cm³	0.759 in³
Plastic section modulus (Zx)	24.55 cm³	1.498 in³
Plastic section modulus (Zy)	16.29 cm³	0.994 in³
Radius of gyration (rx)	2.25 cm	0.886 in
Radius of gyration (ry)	1.42 cm	0.560 in