CHS 299x18 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 299x18 steel profile weighs 124.7 kg/m (83.83 lb/ft). Cross-sectional area: 15,890.176 mm². Moment of inertia Ix = 15,748.157 cm⁴, Iy = 15,748.157 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Thickness (t)	18 mm	0.71 in
Diameter (d)	299 mm	11.77 in
Weight	124.7 kg/m	83.83 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	15,890.18 mm²	24.630 in²
Moment of inertia (Ix)	15,748.16 cm⁴	378.35 in⁴
Moment of inertia (Iy)	15,748.16 cm⁴	378.35 in⁴
Elastic section modulus (Sx)	1,053.39 cm³	64.282 in³
Elastic section modulus (Sy)	1,053.39 cm³	64.282 in³
Plastic section modulus (Zx)	1,423.24 cm³	86.852 in³
Plastic section modulus (Zy)	1,423.24 cm³	86.852 in³
Radius of gyration (rx)	9.96 cm	3.919 in
Radius of gyration (ry)	9.96 cm	3.919 in