CHS 21.3x3.73 Hylsa · Weight & Dimensions

Hylsa, 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 21.3x3.73 steel profile weighs 1.6 kg/m (1.09 lb/ft). Cross-sectional area: 205.888 mm². Moment of inertia Ix = 0.83 cm⁴, Iy = 0.83 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.73 mm ≈ 9 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	3.7 mm	0.15 in
Diameter (d)	21.3 mm	0.84 in
Weight	1.6 kg/m	1.09 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	205.89 mm²	0.319 in²
Moment of inertia (Ix)	0.83 cm⁴	0.02 in⁴
Moment of inertia (Iy)	0.83 cm⁴	0.02 in⁴
Elastic section modulus (Sx)	0.78 cm³	0.048 in³
Elastic section modulus (Sy)	0.78 cm³	0.048 in³
Plastic section modulus (Zx)	1.17 cm³	0.071 in³
Plastic section modulus (Zy)	1.17 cm³	0.071 in³
Radius of gyration (rx)	0.64 cm	0.250 in
Radius of gyration (ry)	0.64 cm	0.250 in