CHS 88.9x4.78 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 88.9x4.78 steel profile weighs 9.9 kg/m (6.67 lb/ft). Cross-sectional area: 1,263.214 mm². Moment of inertia Ix = 112.095 cm⁴, Iy = 112.095 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 4.78 mm ≈ 7 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	4.8 mm	0.19 in
Diameter (d)	88.9 mm	3.50 in
Weight	9.9 kg/m	6.67 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,263.21 mm²	1.958 in²
Moment of inertia (Ix)	112.09 cm⁴	2.69 in⁴
Moment of inertia (Iy)	112.09 cm⁴	2.69 in⁴
Elastic section modulus (Sx)	25.22 cm³	1.539 in³
Elastic section modulus (Sy)	25.22 cm³	1.539 in³
Plastic section modulus (Zx)	33.86 cm³	2.066 in³
Plastic section modulus (Zy)	33.86 cm³	2.066 in³
Radius of gyration (rx)	2.98 cm	1.173 in
Radius of gyration (ry)	2.98 cm	1.173 in