I 400x400x12.5x30 IAS · Weight & Dimensions

IAS, 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.

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Also known as: I 400x400x12.5x30 (México) · Doble T I 400x400x12.5x30 (Argentina / LATAM) · UB 400 (UK / Australia)

The I 400x400x12.5x30 steel profile weighs 221.8 kg/m (149.02 lb/ft), has a depth of 400 mm (15.75 in), flange width 400 mm (15.75 in). Cross-sectional area: 28,250 mm². Moment of inertia Ix = 86,414.167 cm⁴, Iy = 32,005.534 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)	12.5 mm	0.49 in
Flange thickness (tf)	30 mm	1.18 in
Weight	221.8 kg/m	149.02 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	28,250 mm²	43.788 in²
Moment of inertia (Ix)	86,414.17 cm⁴	2076.10 in⁴
Moment of inertia (Iy)	32,005.53 cm⁴	768.93 in⁴
Elastic section modulus (Sx)	4,320.71 cm³	263.667 in³
Elastic section modulus (Sy)	1,600.28 cm³	97.655 in³
Plastic section modulus (Zx)	4,801.25 cm³	292.991 in³
Plastic section modulus (Zy)	2,413.28 cm³	147.268 in³
Radius of gyration (rx)	17.49 cm	6.886 in
Radius of gyration (ry)	10.64 cm	4.191 in