RHS 80x70x4 Hiasa · Weight & Dimensions

Hiasa, 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 80x70 cal 8 (México) · Caño estructural 80x70 (Argentina)

The RHS 80x70x4 steel profile weighs 8.6 kg/m (5.77 lb/ft), has a depth of 80 mm (3.15 in), flange width 70 mm (2.76 in). Cross-sectional area: 1,094.796 mm². Moment of inertia Ix = 99.481 cm⁴, Iy = 80.843 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)	70 mm	2.76 in
Thickness (t)	4 mm	0.16 in
Fillet radius (r)	8 mm	0.31 in
Weight	8.6 kg/m	5.77 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	1,094.8 mm²	1.697 in²
Moment of inertia (Ix)	99.48 cm⁴	2.39 in⁴
Moment of inertia (Iy)	80.84 cm⁴	1.94 in⁴
Elastic section modulus (Sx)	24.87 cm³	1.518 in³
Elastic section modulus (Sy)	23.1 cm³	1.410 in³
Plastic section modulus (Zx)	30.03 cm³	1.833 in³
Plastic section modulus (Zy)	27.4 cm³	1.672 in³
Radius of gyration (rx)	3.01 cm	1.187 in
Radius of gyration (ry)	2.72 cm	1.070 in