I 550x300x15.5x25 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 550x300x15.5x25 (México) · Doble T I 550x300x15.5x25 (Argentina / LATAM) · UB 550 (UK / Australia)

The I 550x300x15.5x25 steel profile weighs 178.6 kg/m (120.01 lb/ft), has a depth of 550 mm (21.65 in), flange width 300 mm (11.81 in). Cross-sectional area: 22,750 mm². Moment of inertia Ix = 119,583.333 cm⁴, Iy = 11,265.516 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	550 mm	21.65 in
Width (b)	300 mm	11.81 in
Web thickness (tw)	15.5 mm	0.61 in
Flange thickness (tf)	25 mm	0.98 in
Weight	178.6 kg/m	120.01 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	22,750 mm²	35.262 in²
Moment of inertia (Ix)	119,583.33 cm⁴	2872.99 in⁴
Moment of inertia (Iy)	11,265.52 cm⁴	270.65 in⁴
Elastic section modulus (Sx)	4,348.48 cm³	265.362 in³
Elastic section modulus (Sy)	751.03 cm³	45.831 in³
Plastic section modulus (Zx)	4,906.25 cm³	299.399 in³
Plastic section modulus (Zy)	1,155.03 cm³	70.485 in³
Radius of gyration (rx)	22.93 cm	9.026 in
Radius of gyration (ry)	7.04 cm	2.770 in