CHS 18x1.9 Gerdau · Weight & Dimensions

Gerdau, tubes · 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 18x1.9 steel profile weighs 0.8 kg/m (0.50 lb/ft). Cross-sectional area: 96.101 mm². Moment of inertia Ix = 0.316 cm⁴, Iy = 0.316 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 1.9 mm ≈ 14 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	1.9 mm	0.07 in
Diameter (d)	18 mm	0.71 in
Weight	0.8 kg/m	0.50 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	96.1 mm²	0.149 in²
Moment of inertia (Ix)	0.32 cm⁴	0.01 in⁴
Moment of inertia (Iy)	0.32 cm⁴	0.01 in⁴
Elastic section modulus (Sx)	0.35 cm³	0.021 in³
Elastic section modulus (Sy)	0.35 cm³	0.021 in³
Plastic section modulus (Zx)	0.49 cm³	0.030 in³
Plastic section modulus (Zy)	0.49 cm³	0.030 in³
Radius of gyration (rx)	0.57 cm	0.226 in
Radius of gyration (ry)	0.57 cm	0.226 in