I 550x550x20x50 CISC · Weight & Dimensions

CISC, 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.

Also known as: I 550x550x20x50 (México) · Doble T I 550x550x20x50 (Argentina / LATAM) · UB 550 (UK / Australia)

The I 550x550x20x50 steel profile weighs 502.4 kg/m (337.61 lb/ft), has a depth of 550 mm (21.65 in), flange width 550 mm (21.65 in). Cross-sectional area: 64,000 mm². Moment of inertia Ix = 360,083.333 cm⁴, Iy = 138,675.833 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	550 mm	21.65 in
Width (b)	550 mm	21.65 in
Web thickness (tw)	20 mm	0.79 in
Flange thickness (tf)	50 mm	1.97 in
Weight	502.4 kg/m	337.61 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	64,000 mm²	99.200 in²
Moment of inertia (Ix)	360,083.33 cm⁴	8651.00 in⁴
Moment of inertia (Iy)	138,675.83 cm⁴	3331.69 in⁴
Elastic section modulus (Sx)	13,093.94 cm³	799.045 in³
Elastic section modulus (Sy)	5,042.76 cm³	307.729 in³
Plastic section modulus (Zx)	14,762.5 cm³	900.867 in³
Plastic section modulus (Zy)	7,607.5 cm³	464.240 in³
Radius of gyration (rx)	23.72 cm	9.338 in
Radius of gyration (ry)	14.72 cm	5.795 in