SHS 55x55x3.9 Açotubo · Weight & Dimensions

Açotubo, cold-formed sections · Square Hollow Section

Square Hollow Sections (SHS) are tubular profiles with equal sides, ideal for columns and compression members due to their uniform buckling resistance in all directions.

Also known as: PTR 55x55 cal 8 (México) · Caño estructural 55x55 (Argentina)

The SHS 55x55x3.9 steel profile weighs 6.0 kg/m (4.00 lb/ft), has a depth of 55 mm (2.17 in), flange width 55 mm (2.17 in). Cross-sectional area: 757.991 mm². Moment of inertia Ix = 32.094 cm⁴, Iy = 32.094 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.9 mm ≈ 9 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	55 mm	2.17 in
Width (b)	55 mm	2.17 in
Thickness (t)	3.9 mm	0.15 in
Fillet radius (r)	7.8 mm	0.31 in
Weight	6.0 kg/m	4.00 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	757.99 mm²	1.175 in²
Moment of inertia (Ix)	32.09 cm⁴	0.77 in⁴
Moment of inertia (Iy)	32.09 cm⁴	0.77 in⁴
Elastic section modulus (Sx)	11.67 cm³	0.712 in³
Elastic section modulus (Sy)	11.67 cm³	0.712 in³
Plastic section modulus (Zx)	14.26 cm³	0.870 in³
Plastic section modulus (Zy)	14.26 cm³	0.870 in³
Radius of gyration (rx)	2.06 cm	0.810 in
Radius of gyration (ry)	2.06 cm	0.810 in