U 100x40x3.2 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 100x40x3.2 (UK / Australia)

The U 100x40x3.2 steel profile weighs 4.3 kg/m (2.86 lb/ft), has a depth of 100 mm (3.94 in), flange width 40 mm (1.57 in). Cross-sectional area: 542.315 mm². Moment of inertia Ix = 78.583 cm⁴, Iy = 7.981 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	100 mm	3.94 in
Width (b)	40 mm	1.57 in
Thickness (t)	3.2 mm	0.13 in
Weight	4.3 kg/m	2.86 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	542.32 mm²	0.841 in²
Moment of inertia (Ix)	78.58 cm⁴	1.89 in⁴
Moment of inertia (Iy)	7.98 cm⁴	0.19 in⁴
Elastic section modulus (Sx)	15.72 cm³	0.959 in³
Elastic section modulus (Sy)	2.69 cm³	0.164 in³
Plastic section modulus (Zx)	19.39 cm³	1.183 in³
Plastic section modulus (Zy)	3.55 cm³	0.217 in³
Radius of gyration (rx)	3.81 cm	1.499 in
Radius of gyration (ry)	1.21 cm	0.478 in