RHS 80x40x6.4 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 80x40 cal 3 (México) · Caño estructural 80x40 (Argentina)

The RHS 80x40x6.4 steel profile weighs 9.9 kg/m (6.68 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 1,266.679 mm². Moment of inertia Ix = 86.044 cm⁴, Iy = 27.71 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 6.4 mm ≈ 3 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	80 mm	3.15 in
Width (b)	40 mm	1.57 in
Thickness (t)	6.4 mm	0.25 in
Fillet radius (r)	12.8 mm	0.50 in
Weight	9.9 kg/m	6.68 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,266.68 mm²	1.963 in²
Moment of inertia (Ix)	86.04 cm⁴	2.07 in⁴
Moment of inertia (Iy)	27.71 cm⁴	0.67 in⁴
Elastic section modulus (Sx)	21.51 cm³	1.313 in³
Elastic section modulus (Sy)	13.86 cm³	0.845 in³
Plastic section modulus (Zx)	29.2 cm³	1.782 in³
Plastic section modulus (Zy)	17.59 cm³	1.073 in³
Radius of gyration (rx)	2.61 cm	1.026 in
Radius of gyration (ry)	1.48 cm	0.582 in