SHS 31.8x31.8x3.18 CISC · Weight & Dimensions

CISC, 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 31.8x31.8 cal 11 (México) · Caño estructural 31.8x31.8 (Argentina)

The SHS 31.8x31.8x3.18 steel profile weighs 2.6 kg/m (1.78 lb/ft), has a depth of 31.8 mm (1.25 in), flange width 31.8 mm (1.25 in). Cross-sectional area: 338.005 mm². Moment of inertia Ix = 4.424 cm⁴, Iy = 4.424 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.18 mm ≈ 10 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	31.8 mm	1.25 in
Width (b)	31.8 mm	1.25 in
Thickness (t)	3.2 mm	0.13 in
Fillet radius (r)	6.4 mm	0.25 in
Weight	2.6 kg/m	1.78 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	338 mm²	0.524 in²
Moment of inertia (Ix)	4.42 cm⁴	0.11 in⁴
Moment of inertia (Iy)	4.42 cm⁴	0.11 in⁴
Elastic section modulus (Sx)	2.78 cm³	0.170 in³
Elastic section modulus (Sy)	2.78 cm³	0.170 in³
Plastic section modulus (Zx)	3.52 cm³	0.215 in³
Plastic section modulus (Zy)	3.52 cm³	0.215 in³
Radius of gyration (rx)	1.14 cm	0.450 in
Radius of gyration (ry)	1.14 cm	0.450 in