CHS 21x2.77 IMCA · Weight & Dimensions

IMCA, 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 21x2.77 steel profile weighs 1.3 kg/m (0.84 lb/ft). Cross-sectional area: 158.641 mm². Moment of inertia Ix = 0.674 cm⁴, Iy = 0.674 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 2.77 mm ≈ 12 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Thickness (t)	2.8 mm	0.11 in
Diameter (d)	21 mm	0.83 in
Weight	1.3 kg/m	0.84 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	158.64 mm²	0.246 in²
Moment of inertia (Ix)	0.67 cm⁴	0.02 in⁴
Moment of inertia (Iy)	0.67 cm⁴	0.02 in⁴
Elastic section modulus (Sx)	0.64 cm³	0.039 in³
Elastic section modulus (Sy)	0.64 cm³	0.039 in³
Plastic section modulus (Zx)	0.93 cm³	0.057 in³
Plastic section modulus (Zy)	0.93 cm³	0.057 in³
Radius of gyration (rx)	0.65 cm	0.257 in
Radius of gyration (ry)	0.65 cm	0.257 in