CHS 88.9x3.81 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 88.9x3.81 steel profile weighs 8.0 kg/m (5.38 lb/ft). Cross-sectional area: 1,018.482 mm². Moment of inertia Ix = 92.361 cm⁴, Iy = 92.361 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)	88.9 mm	3.50 in
Weight	8.0 kg/m	5.38 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,018.48 mm²	1.579 in²
Moment of inertia (Ix)	92.36 cm⁴	2.22 in⁴
Moment of inertia (Iy)	92.36 cm⁴	2.22 in⁴
Elastic section modulus (Sx)	20.78 cm³	1.268 in³
Elastic section modulus (Sy)	20.78 cm³	1.268 in³
Plastic section modulus (Zx)	27.6 cm³	1.685 in³
Plastic section modulus (Zy)	27.6 cm³	1.685 in³
Radius of gyration (rx)	3.01 cm	1.186 in
Radius of gyration (ry)	3.01 cm	1.186 in