CHS 73x3.18 CISC · Weight & Dimensions

CISC, 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 73x3.18 steel profile weighs 5.5 kg/m (3.68 lb/ft). Cross-sectional area: 697.52 mm². Moment of inertia Ix = 42.592 cm⁴, Iy = 42.592 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.18 mm ≈ 10 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	3.2 mm	0.13 in
Diameter (d)	73 mm	2.87 in
Weight	5.5 kg/m	3.68 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	697.52 mm²	1.081 in²
Moment of inertia (Ix)	42.59 cm⁴	1.02 in⁴
Moment of inertia (Iy)	42.59 cm⁴	1.02 in⁴
Elastic section modulus (Sx)	11.67 cm³	0.712 in³
Elastic section modulus (Sy)	11.67 cm³	0.712 in³
Plastic section modulus (Zx)	15.51 cm³	0.947 in³
Plastic section modulus (Zy)	15.51 cm³	0.947 in³
Radius of gyration (rx)	2.47 cm	0.973 in
Radius of gyration (ry)	2.47 cm	0.973 in