CHS 73x5.5 Açotubo · Weight & Dimensions

Açotubo, cold-formed sections · Circular Hollow Section

Circular Hollow Sections (CHS) are round tubular profiles with the most efficient cross-section for compression. Used for columns, trusses, and architectural structures.

Also known as: Caño estructural redondo (Argentina)

The CHS 73x5.5 steel profile weighs 9.2 kg/m (6.16 lb/ft). Cross-sectional area: 1,166.316 mm². Moment of inertia Ix = 66.866 cm⁴, Iy = 66.866 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 5.5 mm ≈ 4 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	5.5 mm	0.22 in
Diameter (d)	73 mm	2.87 in
Weight	9.2 kg/m	6.16 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,166.32 mm²	1.808 in²
Moment of inertia (Ix)	66.87 cm⁴	1.61 in⁴
Moment of inertia (Iy)	66.87 cm⁴	1.61 in⁴
Elastic section modulus (Sx)	18.32 cm³	1.118 in³
Elastic section modulus (Sy)	18.32 cm³	1.118 in³
Plastic section modulus (Zx)	25.11 cm³	1.533 in³
Plastic section modulus (Zy)	25.11 cm³	1.533 in³
Radius of gyration (rx)	2.39 cm	0.943 in
Radius of gyration (ry)	2.39 cm	0.943 in