RHS 40x30x3 · 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 40x30 cal 11 (México) · Caño estructural 40x30 (Argentina)

The RHS 40x30x3 steel profile weighs 2.9 kg/m (1.92 lb/ft), has a depth of 40 mm (1.57 in), flange width 30 mm (1.18 in). Cross-sectional area: 384 mm². Moment of inertia Ix = 8.14 cm⁴, Iy = 5.08 cm⁴.

Cross-section (not to scale)

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

Dimensions

Property	Metric	Imperial
Depth (h)	40 mm	1.57 in
Width (b)	30 mm	1.18 in
Thickness (t)	3 mm	0.12 in
Fillet radius (r)	6 mm	0.24 in
Weight	2.9 kg/m	1.92 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	384 mm²	0.595 in²
Moment of inertia (Ix)	8.14 cm⁴	0.20 in⁴
Moment of inertia (Iy)	5.08 cm⁴	0.12 in⁴
Elastic section modulus (Sx)	4.07 cm³	0.248 in³
Elastic section modulus (Sy)	3.39 cm³	0.207 in³
Plastic section modulus (Zx)	5.06 cm³	0.309 in³
Plastic section modulus (Zy)	4.1 cm³	0.250 in³
Radius of gyration (rx)	1.46 cm	0.575 in
Radius of gyration (ry)	1.15 cm	0.453 in