RHS 80x40x4.5 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 6 (México) · Caño estructural 80x40 (Argentina)

The RHS 80x40x4.5 steel profile weighs 7.4 kg/m (4.99 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 946.852 mm². Moment of inertia Ix = 70.221 cm⁴, Iy = 23.137 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 4.5 mm ≈ 7 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	80 mm	3.15 in
Width (b)	40 mm	1.57 in
Thickness (t)	4.5 mm	0.18 in
Fillet radius (r)	9 mm	0.35 in
Weight	7.4 kg/m	4.99 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	946.85 mm²	1.468 in²
Moment of inertia (Ix)	70.22 cm⁴	1.69 in⁴
Moment of inertia (Iy)	23.14 cm⁴	0.56 in⁴
Elastic section modulus (Sx)	17.56 cm³	1.071 in³
Elastic section modulus (Sy)	11.57 cm³	0.706 in³
Plastic section modulus (Zx)	22.89 cm³	1.397 in³
Plastic section modulus (Zy)	13.94 cm³	0.851 in³
Radius of gyration (rx)	2.72 cm	1.072 in
Radius of gyration (ry)	1.56 cm	0.615 in