U 40x20x3.2 IAS · Weight & Dimensions

IAS, cold-formed sections · Cold-formed Channel

Cold-formed channels (U shapes) are similar to C shapes but without stiffening lips. Used for light structural framing, supports, and secondary members.

Also known as: U 40x20x3.2 (UK / Australia)

The U 40x20x3.2 steel profile weighs 1.8 kg/m (1.18 lb/ft), has a depth of 40 mm (1.57 in), flange width 20 mm (0.79 in). Cross-sectional area: 222.315 mm². Moment of inertia Ix = 4.839 cm⁴, Iy = 0.8 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	40 mm	1.57 in
Width (b)	20 mm	0.79 in
Thickness (t)	3.2 mm	0.13 in
Weight	1.8 kg/m	1.18 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	222.32 mm²	0.345 in²
Moment of inertia (Ix)	4.84 cm⁴	0.12 in⁴
Moment of inertia (Iy)	0.8 cm⁴	0.02 in⁴
Elastic section modulus (Sx)	2.42 cm³	0.148 in³
Elastic section modulus (Sy)	0.59 cm³	0.036 in³
Plastic section modulus (Zx)	3.25 cm³	0.198 in³
Plastic section modulus (Zy)	0.81 cm³	0.050 in³
Radius of gyration (rx)	1.48 cm	0.581 in
Radius of gyration (ry)	0.6 cm	0.236 in