CHS 133x18 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 133x18 steel profile weighs 51.0 kg/m (34.31 lb/ft). Cross-sectional area: 6,503.097 mm². Moment of inertia Ix = 1,101.381 cm⁴, Iy = 1,101.381 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Thickness (t)	18 mm	0.71 in
Diameter (d)	133 mm	5.24 in
Weight	51.0 kg/m	34.31 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	6,503.1 mm²	10.080 in²
Moment of inertia (Ix)	1,101.38 cm⁴	26.46 in⁴
Moment of inertia (Iy)	1,101.38 cm⁴	26.46 in⁴
Elastic section modulus (Sx)	165.62 cm³	10.107 in³
Elastic section modulus (Sy)	165.62 cm³	10.107 in³
Plastic section modulus (Zx)	239.99 cm³	14.645 in³
Plastic section modulus (Zy)	239.99 cm³	14.645 in³
Radius of gyration (rx)	4.12 cm	1.620 in
Radius of gyration (ry)	4.12 cm	1.620 in