CHS 406x30.9 AHMSA · Weight & Dimensions

AHMSA, 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 406x30.9 steel profile weighs 285.8 kg/m (192.08 lb/ft). Cross-sectional area: 36,412.912 mm². Moment of inertia Ix = 64,475.807 cm⁴, Iy = 64,475.807 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Thickness (t)	30.9 mm	1.22 in
Diameter (d)	406 mm	15.98 in
Weight	285.8 kg/m	192.08 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	36,412.91 mm²	56.440 in²
Moment of inertia (Ix)	64,475.81 cm⁴	1549.03 in⁴
Moment of inertia (Iy)	64,475.81 cm⁴	1549.03 in⁴
Elastic section modulus (Sx)	3,176.15 cm³	193.821 in³
Elastic section modulus (Sy)	3,176.15 cm³	193.821 in³
Plastic section modulus (Zx)	4,357.46 cm³	265.910 in³
Plastic section modulus (Zy)	4,357.46 cm³	265.910 in³
Radius of gyration (rx)	13.31 cm	5.239 in
Radius of gyration (ry)	13.31 cm	5.239 in