CHS 101.6x3.81 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 101.6x3.81 steel profile weighs 9.2 kg/m (6.18 lb/ft). Cross-sectional area: 1,170.494 mm². Moment of inertia Ix = 140.129 cm⁴, Iy = 140.129 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)	101.6 mm	4.00 in
Weight	9.2 kg/m	6.18 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,170.49 mm²	1.814 in²
Moment of inertia (Ix)	140.13 cm⁴	3.37 in⁴
Moment of inertia (Iy)	140.13 cm⁴	3.37 in⁴
Elastic section modulus (Sx)	27.58 cm³	1.683 in³
Elastic section modulus (Sy)	27.58 cm³	1.683 in³
Plastic section modulus (Zx)	36.45 cm³	2.225 in³
Plastic section modulus (Zy)	36.45 cm³	2.225 in³
Radius of gyration (rx)	3.46 cm	1.362 in
Radius of gyration (ry)	3.46 cm	1.362 in