U 100x40x4.18 Tecnometal · Weight & Dimensions

Tecnometal, cold-formed sections (Brazil) · 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 100x40x4.18 (UK / Australia)

The U 100x40x4.18 steel profile weighs 5.5 kg/m (3.67 lb/ft), has a depth of 100 mm (3.94 in), flange width 40 mm (1.57 in). Cross-sectional area: 694.924 mm². Moment of inertia Ix = 98.039 cm⁴, Iy = 10.004 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 4.18 mm ≈ 8 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	100 mm	3.94 in
Width (b)	40 mm	1.57 in
Thickness (t)	4.2 mm	0.16 in
Fillet radius (r)	4.2 mm	0.16 in
Weight	5.5 kg/m	3.67 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	694.92 mm²	1.077 in²
Moment of inertia (Ix)	98.04 cm⁴	2.36 in⁴
Moment of inertia (Iy)	10 cm⁴	0.24 in⁴
Elastic section modulus (Sx)	19.61 cm³	1.197 in³
Elastic section modulus (Sy)	3.42 cm³	0.209 in³
Plastic section modulus (Zx)	24.78 cm³	1.512 in³
Plastic section modulus (Zy)	4.54 cm³	0.277 in³
Radius of gyration (rx)	3.76 cm	1.479 in
Radius of gyration (ry)	1.2 cm	0.472 in