RHS 40x20x0.9 Acindar · Weight & Dimensions

Acindar, 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 40x20 cal 18 (México) · Caño estructural 40x20 (Argentina)

The RHS 40x20x0.9 steel profile weighs 0.8 kg/m (0.54 lb/ft), has a depth of 40 mm (1.57 in), flange width 20 mm (0.79 in). Cross-sectional area: 102.674 mm². Moment of inertia Ix = 2.13 cm⁴, Iy = 0.727 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 0.9 mm ≈ 18 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	40 mm	1.57 in
Width (b)	20 mm	0.79 in
Thickness (t)	0.9 mm	0.04 in
Fillet radius (r)	1.8 mm	0.07 in
Weight	0.8 kg/m	0.54 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	102.67 mm²	0.159 in²
Moment of inertia (Ix)	2.13 cm⁴	0.05 in⁴
Moment of inertia (Iy)	0.73 cm⁴	0.02 in⁴
Elastic section modulus (Sx)	1.07 cm³	0.065 in³
Elastic section modulus (Sy)	0.73 cm³	0.044 in³
Plastic section modulus (Zx)	1.32 cm³	0.080 in³
Plastic section modulus (Zy)	0.82 cm³	0.050 in³
Radius of gyration (rx)	1.44 cm	0.567 in
Radius of gyration (ry)	0.84 cm	0.331 in