U 125x50x3.75 ABNT NBR 6355 · Weight & Dimensions

ABNT NBR 6355 · 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 125x50x3.75 (UK / Australia)

The U 125x50x3.75 steel profile weighs 6.3 kg/m (4.21 lb/ft), has a depth of 125 mm (4.92 in), flange width 50 mm (1.97 in). Cross-sectional area: 797.491 mm². Moment of inertia Ix = 181.534 cm⁴, Iy = 18.421 cm⁴.

Cross-section (not to scale)

Gauge equivalent: 3.75 mm ≈ 9 gauge (Manufacturers Standard Gage)

Dimensions

Property	Metric	Imperial
Depth (h)	125 mm	4.92 in
Width (b)	50 mm	1.97 in
Thickness (t)	3.8 mm	0.15 in
Fillet radius (r)	3.8 mm	0.15 in
Weight	6.3 kg/m	4.21 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	797.49 mm²	1.236 in²
Moment of inertia (Ix)	181.53 cm⁴	4.36 in⁴
Moment of inertia (Iy)	18.42 cm⁴	0.44 in⁴
Elastic section modulus (Sx)	29.05 cm³	1.772 in³
Elastic section modulus (Sy)	4.95 cm³	0.302 in³
Plastic section modulus (Zx)	35.66 cm³	2.176 in³
Plastic section modulus (Zy)	6.52 cm³	0.398 in³
Radius of gyration (rx)	4.77 cm	1.878 in
Radius of gyration (ry)	1.52 cm	0.598 in