U 100x40x2.5 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 100x40x2.5 (UK / Australia)

The U 100x40x2.5 steel profile weighs 3.4 kg/m (2.26 lb/ft), has a depth of 100 mm (3.94 in), flange width 40 mm (1.57 in). Cross-sectional area: 429.441 mm². Moment of inertia Ix = 63.401 cm⁴, Iy = 6.42 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)	2.5 mm	0.10 in
Weight	3.4 kg/m	2.26 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	429.44 mm²	0.666 in²
Moment of inertia (Ix)	63.4 cm⁴	1.52 in⁴
Moment of inertia (Iy)	6.42 cm⁴	0.15 in⁴
Elastic section modulus (Sx)	12.68 cm³	0.774 in³
Elastic section modulus (Sy)	2.14 cm³	0.131 in³
Plastic section modulus (Zx)	15.39 cm³	0.939 in³
Plastic section modulus (Zy)	2.81 cm³	0.172 in³
Radius of gyration (rx)	3.84 cm	1.513 in
Radius of gyration (ry)	1.22 cm	0.481 in