RHS 80x40x4 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 8 (México) · Caño estructural 80x40 (Argentina)

The RHS 80x40x4 steel profile weighs 6.7 kg/m (4.51 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 854.796 mm². Moment of inertia Ix = 64.793 cm⁴, Iy = 21.485 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 4 mm ≈ 8 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 mm	0.16 in
Fillet radius (r)	8 mm	0.31 in
Weight	6.7 kg/m	4.51 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	854.8 mm²	1.325 in²
Moment of inertia (Ix)	64.79 cm⁴	1.56 in⁴
Moment of inertia (Iy)	21.49 cm⁴	0.52 in⁴
Elastic section modulus (Sx)	16.2 cm³	0.988 in³
Elastic section modulus (Sy)	10.74 cm³	0.656 in³
Plastic section modulus (Zx)	20.91 cm³	1.276 in³
Plastic section modulus (Zy)	12.77 cm³	0.780 in³
Radius of gyration (rx)	2.75 cm	1.084 in
Radius of gyration (ry)	1.59 cm	0.624 in