RHS 220x180x6.4 Açotubo · Weight & Dimensions

Açotubo, cold-formed sections · Rectangular Hollow Section

Rectangular Hollow Sections (RHS) are tubular profiles with excellent torsional resistance and aesthetic appeal. Used for columns, trusses, and exposed structural elements.

Also known as: PTR 220x180 cal 3 (México) · Caño estructural 220x180 (Argentina)

The RHS 220x180x6.4 steel profile weighs 38.1 kg/m (25.59 lb/ft), has a depth of 220 mm (8.66 in), flange width 180 mm (7.09 in). Cross-sectional area: 4,850.679 mm². Moment of inertia Ix = 3,452.818 cm⁴, Iy = 2,538.054 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 6.4 mm ≈ 3 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	220 mm	8.66 in
Width (b)	180 mm	7.09 in
Thickness (t)	6.4 mm	0.25 in
Fillet radius (r)	12.8 mm	0.50 in
Weight	38.1 kg/m	25.59 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	4,850.68 mm²	7.519 in²
Moment of inertia (Ix)	3,452.82 cm⁴	82.95 in⁴
Moment of inertia (Iy)	2,538.05 cm⁴	60.98 in⁴
Elastic section modulus (Sx)	313.89 cm³	19.155 in³
Elastic section modulus (Sy)	282.01 cm³	17.209 in³
Plastic section modulus (Zx)	371.97 cm³	22.699 in³
Plastic section modulus (Zy)	324.52 cm³	19.804 in³
Radius of gyration (rx)	8.44 cm	3.322 in
Radius of gyration (ry)	7.23 cm	2.848 in