CHS 40x3.5 Hiasa · Weight & Dimensions

Hiasa, 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 40x3.5 steel profile weighs 3.1 kg/m (2.12 lb/ft). Cross-sectional area: 401.338 mm². Moment of inertia Ix = 6.745 cm⁴, Iy = 6.745 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.5 mm ≈ 10 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	3.5 mm	0.14 in
Diameter (d)	40 mm	1.57 in
Weight	3.1 kg/m	2.12 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	401.34 mm²	0.622 in²
Moment of inertia (Ix)	6.74 cm⁴	0.16 in⁴
Moment of inertia (Iy)	6.74 cm⁴	0.16 in⁴
Elastic section modulus (Sx)	3.37 cm³	0.206 in³
Elastic section modulus (Sy)	3.37 cm³	0.206 in³
Plastic section modulus (Zx)	4.68 cm³	0.285 in³
Plastic section modulus (Zy)	4.68 cm³	0.285 in³
Radius of gyration (rx)	1.3 cm	0.510 in
Radius of gyration (ry)	1.3 cm	0.510 in