RHS 80x40x3.5 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 11 (México) · Caño estructural 80x40 (Argentina)

The RHS 80x40x3.5 steel profile weighs 6.0 kg/m (4.01 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 759.454 mm². Moment of inertia Ix = 58.808 cm⁴, Iy = 19.628 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.5 mm ≈ 10 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	80 mm	3.15 in
Width (b)	40 mm	1.57 in
Thickness (t)	3.5 mm	0.14 in
Fillet radius (r)	7 mm	0.28 in
Weight	6.0 kg/m	4.01 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	759.45 mm²	1.177 in²
Moment of inertia (Ix)	58.81 cm⁴	1.41 in⁴
Moment of inertia (Iy)	19.63 cm⁴	0.47 in⁴
Elastic section modulus (Sx)	14.7 cm³	0.897 in³
Elastic section modulus (Sy)	9.81 cm³	0.599 in³
Plastic section modulus (Zx)	18.79 cm³	1.147 in³
Plastic section modulus (Zy)	11.52 cm³	0.703 in³
Radius of gyration (rx)	2.78 cm	1.096 in
Radius of gyration (ry)	1.61 cm	0.633 in