I 903x304x15.5x20 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 903x304x15.5x20 (México) · Doble T I 903x304x15.5x20 (Argentina / LATAM) · UB 903 (UK / Australia)

The I 903x304x15.5x20 steel profile weighs 200.5 kg/m (134.71 lb/ft), has a depth of 903 mm (35.55 in), flange width 304 mm (11.97 in). Cross-sectional area: 25,536.5 mm². Moment of inertia Ix = 320,086.01 cm⁴, Iy = 9,391.602 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	903 mm	35.55 in
Width (b)	304 mm	11.97 in
Web thickness (tw)	15.5 mm	0.61 in
Flange thickness (tf)	20 mm	0.79 in
Weight	200.5 kg/m	134.71 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	25,536.5 mm²	39.582 in²
Moment of inertia (Ix)	320,086.01 cm⁴	7690.07 in⁴
Moment of inertia (Iy)	9,391.6 cm⁴	225.63 in⁴
Elastic section modulus (Sx)	7,089.39 cm³	432.623 in³
Elastic section modulus (Sy)	617.87 cm³	37.705 in³
Plastic section modulus (Zx)	8,254.62 cm³	503.730 in³
Plastic section modulus (Zy)	975.99 cm³	59.559 in³
Radius of gyration (rx)	35.4 cm	13.939 in
Radius of gyration (ry)	6.06 cm	2.388 in