RHS 45x20x1 Hiasa · Weight & Dimensions

Hiasa, 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 45x20 cal 18 (México) · Caño estructural 45x20 (Argentina)

The RHS 45x20x1 steel profile weighs 1.0 kg/m (0.65 lb/ft), has a depth of 45 mm (1.77 in), flange width 20 mm (0.79 in). Cross-sectional area: 123.425 mm². Moment of inertia Ix = 3.133 cm⁴, Iy = 0.885 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 1 mm ≈ 18 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	45 mm	1.77 in
Width (b)	20 mm	0.79 in
Thickness (t)	1 mm	0.04 in
Fillet radius (r)	2 mm	0.08 in
Weight	1.0 kg/m	0.65 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	123.42 mm²	0.191 in²
Moment of inertia (Ix)	3.13 cm⁴	0.08 in⁴
Moment of inertia (Iy)	0.89 cm⁴	0.02 in⁴
Elastic section modulus (Sx)	1.39 cm³	0.085 in³
Elastic section modulus (Sy)	0.89 cm³	0.054 in³
Plastic section modulus (Zx)	1.75 cm³	0.107 in³
Plastic section modulus (Zy)	0.99 cm³	0.061 in³
Radius of gyration (rx)	1.59 cm	0.627 in
Radius of gyration (ry)	0.85 cm	0.333 in