U 100x40x3.8 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 100x40x3.8 (UK / Australia)

The U 100x40x3.8 steel profile weighs 5.0 kg/m (3.36 lb/ft), has a depth of 100 mm (3.94 in), flange width 40 mm (1.57 in). Cross-sectional area: 636.5 mm². Moment of inertia Ix = 90.74 cm⁴, Iy = 9.242 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.8 mm ≈ 9 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	100 mm	3.94 in
Width (b)	40 mm	1.57 in
Thickness (t)	3.8 mm	0.15 in
Fillet radius (r)	3.8 mm	0.15 in
Weight	5.0 kg/m	3.36 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	636.5 mm²	0.987 in²
Moment of inertia (Ix)	90.74 cm⁴	2.18 in⁴
Moment of inertia (Iy)	9.24 cm⁴	0.22 in⁴
Elastic section modulus (Sx)	18.15 cm³	1.107 in³
Elastic section modulus (Sy)	3.14 cm³	0.192 in³
Plastic section modulus (Zx)	22.72 cm³	1.386 in³
Plastic section modulus (Zy)	4.16 cm³	0.254 in³
Radius of gyration (rx)	3.78 cm	1.487 in
Radius of gyration (ry)	1.2 cm	0.474 in