I 400x400x12.5x20 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 400x400x12.5x20 (México) · Doble T I 400x400x12.5x20 (Argentina / LATAM) · UB 400 (UK / Australia)

The I 400x400x12.5x20 steel profile weighs 160.9 kg/m (108.14 lb/ft), has a depth of 400 mm (15.75 in), flange width 400 mm (15.75 in). Cross-sectional area: 20,500 mm². Moment of inertia Ix = 62,673.333 cm⁴, Iy = 21,339.193 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)	20 mm	0.79 in
Weight	160.9 kg/m	108.14 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	20,500 mm²	31.775 in²
Moment of inertia (Ix)	62,673.33 cm⁴	1505.73 in⁴
Moment of inertia (Iy)	21,339.19 cm⁴	512.67 in⁴
Elastic section modulus (Sx)	3,133.67 cm³	191.229 in³
Elastic section modulus (Sy)	1,066.96 cm³	65.110 in³
Plastic section modulus (Zx)	3,445 cm³	210.228 in³
Plastic section modulus (Zy)	1,614.06 cm³	98.497 in³
Radius of gyration (rx)	17.48 cm	6.884 in
Radius of gyration (ry)	10.2 cm	4.017 in