I 400x400x20x35 CISC · Weight & Dimensions

CISC, 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: I 400x400x20x35 (México) · Doble T I 400x400x20x35 (Argentina / LATAM) · UB 400 (UK / Australia)

The I 400x400x20x35 steel profile weighs 271.6 kg/m (182.52 lb/ft), has a depth of 400 mm (15.75 in), flange width 400 mm (15.75 in). Cross-sectional area: 34,600 mm². Moment of inertia Ix = 99,532.833 cm⁴, Iy = 37,355.333 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)	20 mm	0.79 in
Flange thickness (tf)	35 mm	1.38 in
Weight	271.6 kg/m	182.52 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	34,600 mm²	53.630 in²
Moment of inertia (Ix)	99,532.83 cm⁴	2391.28 in⁴
Moment of inertia (Iy)	37,355.33 cm⁴	897.46 in⁴
Elastic section modulus (Sx)	4,976.64 cm³	303.695 in³
Elastic section modulus (Sy)	1,867.77 cm³	113.979 in³
Plastic section modulus (Zx)	5,654.5 cm³	345.060 in³
Plastic section modulus (Zy)	2,833 cm³	172.881 in³
Radius of gyration (rx)	16.96 cm	6.677 in
Radius of gyration (ry)	10.39 cm	4.091 in