CS 400x128 Usiminas · Weight & Dimensions

Usiminas, welded sections · Wide Flange (I-beam)

Wide flange beams (W shapes / I-beams) are the most common structural steel profile used in building construction. They are used for beams, columns, and girders in steel-framed buildings and bridges. Designed per AISC 360, Eurocode 3, and NBR 8800.

Also known as: CS 400x128 (México) · Doble T CS 400x128 (Argentina / LATAM) · UB 400 (UK / Australia)

The CS 400x128 steel profile weighs 128.0 kg/m (85.98 lb/ft), has a depth of 400 mm (15.75 in), flange width 400 mm (15.75 in). Cross-sectional area: 16,296 mm². Moment of inertia Ix = 51,158.579 cm⁴, Iy = 17,069.296 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	400 mm	15.75 in
Width (b)	400 mm	15.75 in
Web thickness (tw)	9.5 mm	0.37 in
Flange thickness (tf)	16 mm	0.63 in
Weight	128.0 kg/m	85.98 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	16,296 mm²	25.259 in²
Moment of inertia (Ix)	51,158.58 cm⁴	1229.08 in⁴
Moment of inertia (Iy)	17,069.3 cm⁴	410.09 in⁴
Elastic section modulus (Sx)	2,557.93 cm³	156.095 in³
Elastic section modulus (Sy)	853.46 cm³	52.082 in³
Plastic section modulus (Zx)	2,779.23 cm³	169.600 in³
Plastic section modulus (Zy)	1,288.3 cm³	78.617 in³
Radius of gyration (rx)	17.72 cm	6.976 in
Radius of gyration (ry)	10.23 cm	4.029 in