U 80x40x2.5 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 80x40x2.5 (UK / Australia)

The U 80x40x2.5 steel profile weighs 3.0 kg/m (2.00 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 379.441 mm². Moment of inertia Ix = 37.551 cm⁴, Iy = 5.984 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	80 mm	3.15 in
Width (b)	40 mm	1.57 in
Thickness (t)	2.5 mm	0.10 in
Weight	3.0 kg/m	2.00 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	379.44 mm²	0.588 in²
Moment of inertia (Ix)	37.55 cm⁴	0.90 in⁴
Moment of inertia (Iy)	5.98 cm⁴	0.14 in⁴
Elastic section modulus (Sx)	9.39 cm³	0.573 in³
Elastic section modulus (Sy)	2.07 cm³	0.127 in³
Plastic section modulus (Zx)	11.26 cm³	0.687 in³
Plastic section modulus (Zy)	2.74 cm³	0.167 in³
Radius of gyration (rx)	3.15 cm	1.239 in
Radius of gyration (ry)	1.26 cm	0.494 in