RHS 120x40x4 · Weight & Dimensions

BR — 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 120x40 cal 8 (México) · Caño estructural 120x40 (Argentina)

The RHS 120x40x4 steel profile weighs 9.2 kg/m (6.20 lb/ft), has a depth of 120 mm (4.72 in), flange width 40 mm (1.57 in). Cross-sectional area: 1,216 mm². Moment of inertia Ix = 201.35 cm⁴, Iy = 33.42 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 4 mm ≈ 8 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	120 mm	4.72 in
Width (b)	40 mm	1.57 in
Thickness (t)	4 mm	0.16 in
Fillet radius (r)	8 mm	0.31 in
Weight	9.2 kg/m	6.20 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,216 mm²	1.885 in²
Moment of inertia (Ix)	201.35 cm⁴	4.84 in⁴
Moment of inertia (Iy)	33.42 cm⁴	0.80 in⁴
Elastic section modulus (Sx)	33.56 cm³	2.048 in³
Elastic section modulus (Sy)	16.71 cm³	1.020 in³
Plastic section modulus (Zx)	43.65 cm³	2.664 in³
Plastic section modulus (Zy)	19.33 cm³	1.180 in³
Radius of gyration (rx)	4.07 cm	1.602 in
Radius of gyration (ry)	1.66 cm	0.654 in