RHS 120x40x3 · 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 11 (México) · Caño estructural 120x40 (Argentina)

The RHS 120x40x3 steel profile weighs 7.1 kg/m (4.75 lb/ft), has a depth of 120 mm (4.72 in), flange width 40 mm (1.57 in). Cross-sectional area: 924 mm². Moment of inertia Ix = 156.23 cm⁴, Iy = 26.66 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3 mm ≈ 11 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	120 mm	4.72 in
Width (b)	40 mm	1.57 in
Thickness (t)	3 mm	0.12 in
Fillet radius (r)	6 mm	0.24 in
Weight	7.1 kg/m	4.75 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	924 mm²	1.432 in²
Moment of inertia (Ix)	156.23 cm⁴	3.75 in⁴
Moment of inertia (Iy)	26.66 cm⁴	0.64 in⁴
Elastic section modulus (Sx)	26.04 cm³	1.589 in³
Elastic section modulus (Sy)	13.33 cm³	0.813 in³
Plastic section modulus (Zx)	33.53 cm³	2.046 in³
Plastic section modulus (Zy)	15.05 cm³	0.918 in³
Radius of gyration (rx)	4.11 cm	1.618 in
Radius of gyration (ry)	1.7 cm	0.669 in