RHS 100x80x4 · 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 100x80 cal 8 (México) · Caño estructural 100x80 (Argentina)

The RHS 100x80x4 steel profile weighs 10.5 kg/m (7.06 lb/ft), has a depth of 100 mm (3.94 in), flange width 80 mm (3.15 in). Cross-sectional area: 1,376 mm². Moment of inertia Ix = 199.45 cm⁴, Iy = 140.51 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)	80 mm	3.15 in
Thickness (t)	4 mm	0.16 in
Fillet radius (r)	8 mm	0.31 in
Weight	10.5 kg/m	7.06 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,376 mm²	2.133 in²
Moment of inertia (Ix)	199.45 cm⁴	4.79 in⁴
Moment of inertia (Iy)	140.51 cm⁴	3.38 in⁴
Elastic section modulus (Sx)	39.89 cm³	2.434 in³
Elastic section modulus (Sy)	35.13 cm³	2.144 in³
Plastic section modulus (Zx)	47.65 cm³	2.908 in³
Plastic section modulus (Zy)	40.77 cm³	2.488 in³
Radius of gyration (rx)	3.81 cm	1.500 in
Radius of gyration (ry)	3.2 cm	1.260 in