RHS 80x40x2.5 SAISC · Weight & Dimensions

SAISC, cold-formed sections · 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 80x40 cal 13 (México) · Caño estructural 80x40 (Argentina)

The RHS 80x40x2.5 steel profile weighs 4.4 kg/m (2.95 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 558.905 mm². Moment of inertia Ix = 45.106 cm⁴, Iy = 15.257 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 2.5 mm ≈ 12 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	80 mm	3.15 in
Width (b)	40 mm	1.57 in
Thickness (t)	2.5 mm	0.10 in
Fillet radius (r)	5 mm	0.20 in
Weight	4.4 kg/m	2.95 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	558.9 mm²	0.866 in²
Moment of inertia (Ix)	45.11 cm⁴	1.08 in⁴
Moment of inertia (Iy)	15.26 cm⁴	0.37 in⁴
Elastic section modulus (Sx)	11.28 cm³	0.688 in³
Elastic section modulus (Sy)	7.63 cm³	0.466 in³
Plastic section modulus (Zx)	14.15 cm³	0.863 in³
Plastic section modulus (Zy)	8.72 cm³	0.532 in³
Radius of gyration (rx)	2.84 cm	1.118 in
Radius of gyration (ry)	1.65 cm	0.650 in