RHS 100x80x5 · 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 6 (México) · Caño estructural 100x80 (Argentina)

The RHS 100x80x5 steel profile weighs 12.8 kg/m (8.60 lb/ft), has a depth of 100 mm (3.94 in), flange width 80 mm (3.15 in). Cross-sectional area: 1,700 mm². Moment of inertia Ix = 241.42 cm⁴, Iy = 169.42 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 5 mm ≈ 6 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	100 mm	3.94 in
Width (b)	80 mm	3.15 in
Thickness (t)	5 mm	0.20 in
Fillet radius (r)	10 mm	0.39 in
Weight	12.8 kg/m	8.60 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,700 mm²	2.635 in²
Moment of inertia (Ix)	241.42 cm⁴	5.80 in⁴
Moment of inertia (Iy)	169.42 cm⁴	4.07 in⁴
Elastic section modulus (Sx)	48.28 cm³	2.946 in³
Elastic section modulus (Sy)	42.35 cm³	2.584 in³
Plastic section modulus (Zx)	58.25 cm³	3.555 in³
Plastic section modulus (Zy)	49.75 cm³	3.036 in³
Radius of gyration (rx)	3.77 cm	1.484 in
Radius of gyration (ry)	3.16 cm	1.244 in