CHS 121x9 GOST · Weight & Dimensions

GOST, 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 121x9 steel profile weighs 24.9 kg/m (16.71 lb/ft). Cross-sectional area: 3,166.725 mm². Moment of inertia Ix = 499.749 cm⁴, Iy = 499.749 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Thickness (t)	9 mm	0.35 in
Diameter (d)	121 mm	4.76 in
Weight	24.9 kg/m	16.71 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	3,166.73 mm²	4.908 in²
Moment of inertia (Ix)	499.75 cm⁴	12.01 in⁴
Moment of inertia (Iy)	499.75 cm⁴	12.01 in⁴
Elastic section modulus (Sx)	82.6 cm³	5.041 in³
Elastic section modulus (Sy)	82.6 cm³	5.041 in³
Plastic section modulus (Zx)	113.14 cm³	6.904 in³
Plastic section modulus (Zy)	113.14 cm³	6.904 in³
Radius of gyration (rx)	3.97 cm	1.564 in
Radius of gyration (ry)	3.97 cm	1.564 in