CHS 73x3.81 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 73x3.81 steel profile weighs 6.5 kg/m (4.37 lb/ft). Cross-sectional area: 828.167 mm². Moment of inertia Ix = 49.708 cm⁴, Iy = 49.708 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.81 mm ≈ 9 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	3.8 mm	0.15 in
Diameter (d)	73 mm	2.87 in
Weight	6.5 kg/m	4.37 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	828.17 mm²	1.284 in²
Moment of inertia (Ix)	49.71 cm⁴	1.19 in⁴
Moment of inertia (Iy)	49.71 cm⁴	1.19 in⁴
Elastic section modulus (Sx)	13.62 cm³	0.831 in³
Elastic section modulus (Sy)	13.62 cm³	0.831 in³
Plastic section modulus (Zx)	18.26 cm³	1.114 in³
Plastic section modulus (Zy)	18.26 cm³	1.114 in³
Radius of gyration (rx)	2.45 cm	0.965 in
Radius of gyration (ry)	2.45 cm	0.965 in