RHS 70x40x4.4 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 70x40x4.4 steel profile weighs 6.6 kg/m (4.44 lb/ft), has a depth of 70 mm (2.76 in), flange width 40 mm (1.57 in). Cross-sectional area: 840.704 mm². Moment of inertia Ix = 48.922 cm⁴, Iy = 20.02 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 4.4 mm ≈ 7 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	70 mm	2.76 in
Width (b)	40 mm	1.57 in
Thickness (t)	4.4 mm	0.17 in
Fillet radius (r)	8.8 mm	0.35 in
Weight	6.6 kg/m	4.44 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	840.7 mm²	1.303 in²
Moment of inertia (Ix)	48.92 cm⁴	1.18 in⁴
Moment of inertia (Iy)	20.02 cm⁴	0.48 in⁴
Elastic section modulus (Sx)	13.98 cm³	0.853 in³
Elastic section modulus (Sy)	10.01 cm³	0.611 in³
Plastic section modulus (Zx)	18.08 cm³	1.103 in³
Plastic section modulus (Zy)	12.15 cm³	0.741 in³
Radius of gyration (rx)	2.41 cm	0.950 in
Radius of gyration (ry)	1.54 cm	0.608 in