U 300 x 45,5 British Steel · Weight & Dimensions

British Steel, hot-rolled 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 300 x 45,5 (UK / Australia)

The U 300 x 45,5 steel profile weighs 45.5 kg/m (30.60 lb/ft), has a depth of 300 mm (11.81 in), flange width 100 mm (3.94 in). Cross-sectional area: 5,799.571 mm². Moment of inertia Ix = 8,229.416 cm⁴, Iy = 567.805 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	300 mm	11.81 in
Width (b)	100 mm	3.94 in
Web thickness (tw)	9 mm	0.35 in
Flange thickness (tf)	16.5 mm	0.65 in
Fillet radius (r)	15 mm	0.59 in
Weight	45.5 kg/m	30.60 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	5,799.57 mm²	8.989 in²
Moment of inertia (Ix)	8,229.42 cm⁴	197.71 in⁴
Moment of inertia (Iy)	567.8 cm⁴	13.64 in⁴
Elastic section modulus (Sx)	548.63 cm³	33.479 in³
Elastic section modulus (Sy)	81.72 cm³	4.987 in³
Plastic section modulus (Zx)	640.74 cm³	39.101 in³
Plastic section modulus (Zy)	148.34 cm³	9.052 in³
Radius of gyration (rx)	11.91 cm	4.690 in
Radius of gyration (ry)	3.13 cm	1.232 in