RHS 80x70x3.5 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 11 (México) · Caño estructural 80x70 (Argentina)

The RHS 80x70x3.5 steel profile weighs 7.6 kg/m (5.11 lb/ft), has a depth of 80 mm (3.15 in), flange width 70 mm (2.76 in). Cross-sectional area: 969.454 mm². Moment of inertia Ix = 89.553 cm⁴, Iy = 72.838 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)	70 mm	2.76 in
Thickness (t)	3.5 mm	0.14 in
Fillet radius (r)	7 mm	0.28 in
Weight	7.6 kg/m	5.11 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	969.45 mm²	1.503 in²
Moment of inertia (Ix)	89.55 cm⁴	2.15 in⁴
Moment of inertia (Iy)	72.84 cm⁴	1.75 in⁴
Elastic section modulus (Sx)	22.39 cm³	1.366 in³
Elastic section modulus (Sy)	20.81 cm³	1.270 in³
Plastic section modulus (Zx)	26.83 cm³	1.637 in³
Plastic section modulus (Zy)	24.48 cm³	1.494 in³
Radius of gyration (rx)	3.04 cm	1.197 in
Radius of gyration (ry)	2.74 cm	1.079 in