RHS 80x40x4 · Weight & Dimensions

EN — 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: 896 mm². Moment of inertia Ix = 71.13 cm⁴, Iy = 23.01 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)	896 mm²	1.389 in²
Moment of inertia (Ix)	71.13 cm⁴	1.71 in⁴
Moment of inertia (Iy)	23.01 cm⁴	0.55 in⁴
Elastic section modulus (Sx)	17.78 cm³	1.085 in³
Elastic section modulus (Sy)	11.5 cm³	0.702 in³
Plastic section modulus (Zx)	22.53 cm³	1.375 in³
Plastic section modulus (Zy)	13.57 cm³	0.828 in³
Radius of gyration (rx)	2.82 cm	1.110 in
Radius of gyration (ry)	1.6 cm	0.630 in