CHS 121x17 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 121x17 steel profile weighs 43.6 kg/m (29.30 lb/ft). Cross-sectional area: 5,554.336 mm². Moment of inertia Ix = 771.011 cm⁴, Iy = 771.011 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Thickness (t)	17 mm	0.67 in
Diameter (d)	121 mm	4.76 in
Weight	43.6 kg/m	29.30 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	5,554.34 mm²	8.609 in²
Moment of inertia (Ix)	771.01 cm⁴	18.52 in⁴
Moment of inertia (Iy)	771.01 cm⁴	18.52 in⁴
Elastic section modulus (Sx)	127.44 cm³	7.777 in³
Elastic section modulus (Sy)	127.44 cm³	7.777 in³
Plastic section modulus (Zx)	185.51 cm³	11.321 in³
Plastic section modulus (Zy)	185.51 cm³	11.321 in³
Radius of gyration (rx)	3.73 cm	1.467 in
Radius of gyration (ry)	3.73 cm	1.467 in