U 40x20x2.5 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 40x20x2.5 (UK / Australia)

The U 40x20x2.5 steel profile weighs 1.4 kg/m (0.95 lb/ft), has a depth of 40 mm (1.57 in), flange width 20 mm (0.79 in). Cross-sectional area: 179.441 mm². Moment of inertia Ix = 4.097 cm⁴, Iy = 0.668 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)	2.5 mm	0.10 in
Weight	1.4 kg/m	0.95 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	179.44 mm²	0.278 in²
Moment of inertia (Ix)	4.1 cm⁴	0.10 in⁴
Moment of inertia (Iy)	0.67 cm⁴	0.02 in⁴
Elastic section modulus (Sx)	2.05 cm³	0.125 in³
Elastic section modulus (Sy)	0.48 cm³	0.029 in³
Plastic section modulus (Zx)	2.64 cm³	0.161 in³
Plastic section modulus (Zy)	0.65 cm³	0.040 in³
Radius of gyration (rx)	1.51 cm	0.595 in
Radius of gyration (ry)	0.61 cm	0.240 in