RHS 100x80x6.4 Açotubo · Weight & Dimensions

Açotubo, 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 100x80 cal 3 (México) · Caño estructural 100x80 (Argentina)

The RHS 100x80x6.4 steel profile weighs 16.0 kg/m (10.73 lb/ft), has a depth of 100 mm (3.94 in), flange width 80 mm (3.15 in). Cross-sectional area: 2,034.679 mm². Moment of inertia Ix = 270.278 cm⁴, Iy = 190.311 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 6.4 mm ≈ 3 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	100 mm	3.94 in
Width (b)	80 mm	3.15 in
Thickness (t)	6.4 mm	0.25 in
Fillet radius (r)	12.8 mm	0.50 in
Weight	16.0 kg/m	10.73 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	2,034.68 mm²	3.154 in²
Moment of inertia (Ix)	270.28 cm⁴	6.49 in⁴
Moment of inertia (Iy)	190.31 cm⁴	4.57 in⁴
Elastic section modulus (Sx)	54.06 cm³	3.299 in³
Elastic section modulus (Sy)	47.58 cm³	2.903 in³
Plastic section modulus (Zx)	67.11 cm³	4.095 in³
Plastic section modulus (Zy)	57.46 cm³	3.507 in³
Radius of gyration (rx)	3.64 cm	1.435 in
Radius of gyration (ry)	3.06 cm	1.204 in