RHS 100x40x4 · 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 100x40 cal 8 (México) · Caño estructural 100x40 (Argentina)

The RHS 100x40x4 steel profile weighs 8.0 kg/m (5.34 lb/ft), has a depth of 100 mm (3.94 in), flange width 40 mm (1.57 in). Cross-sectional area: 1,056 mm². Moment of inertia Ix = 125.68 cm⁴, Iy = 28.21 cm⁴.

Cross-section (not to scale)

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

Dimensions

Property	Metric	Imperial
Depth (h)	100 mm	3.94 in
Width (b)	40 mm	1.57 in
Thickness (t)	4 mm	0.16 in
Fillet radius (r)	8 mm	0.31 in
Weight	8.0 kg/m	5.34 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,056 mm²	1.637 in²
Moment of inertia (Ix)	125.68 cm⁴	3.02 in⁴
Moment of inertia (Iy)	28.21 cm⁴	0.68 in⁴
Elastic section modulus (Sx)	25.14 cm³	1.534 in³
Elastic section modulus (Sy)	14.11 cm³	0.861 in³
Plastic section modulus (Zx)	32.29 cm³	1.970 in³
Plastic section modulus (Zy)	16.45 cm³	1.004 in³
Radius of gyration (rx)	3.45 cm	1.358 in
Radius of gyration (ry)	1.63 cm	0.642 in