I 400x400x12.5x40 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 400x400x12.5x40 (México) · Doble T I 400x400x12.5x40 (Argentina / LATAM) · UB 400 (UK / Australia)

The I 400x400x12.5x40 steel profile weighs 282.6 kg/m (189.91 lb/ft), has a depth of 400 mm (15.75 in), flange width 400 mm (15.75 in). Cross-sectional area: 36,000 mm². Moment of inertia Ix = 107,520 cm⁴, Iy = 42,671.875 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)	40 mm	1.57 in
Weight	282.6 kg/m	189.91 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	36,000 mm²	55.800 in²
Moment of inertia (Ix)	107,520 cm⁴	2583.17 in⁴
Moment of inertia (Iy)	42,671.88 cm⁴	1025.19 in⁴
Elastic section modulus (Sx)	5,376 cm³	328.065 in³
Elastic section modulus (Sy)	2,133.59 cm³	130.200 in³
Plastic section modulus (Zx)	6,080 cm³	371.026 in³
Plastic section modulus (Zy)	3,212.5 cm³	196.040 in³
Radius of gyration (rx)	17.28 cm	6.804 in
Radius of gyration (ry)	10.89 cm	4.286 in