CS 550x279 Usiminas · Weight & Dimensions

Usiminas, 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: CS 550x279 (México) · Doble T CS 550x279 (Argentina / LATAM) · UB 550 (UK / Australia)

The CS 550x279 steel profile weighs 278.7 kg/m (187.27 lb/ft), has a depth of 550 mm (21.65 in), flange width 550 mm (21.65 in). Cross-sectional area: 35,500 mm². Moment of inertia Ix = 206,302.083 cm⁴, Iy = 69,339.983 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)	16 mm	0.63 in
Flange thickness (tf)	25 mm	0.98 in
Weight	278.7 kg/m	187.27 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	35,500 mm²	55.025 in²
Moment of inertia (Ix)	206,302.08 cm⁴	4956.41 in⁴
Moment of inertia (Iy)	69,339.98 cm⁴	1665.89 in⁴
Elastic section modulus (Sx)	7,501.89 cm³	457.796 in³
Elastic section modulus (Sy)	2,521.45 cm³	153.869 in³
Plastic section modulus (Zx)	8,218.75 cm³	501.541 in³
Plastic section modulus (Zy)	3,813.25 cm³	232.700 in³
Radius of gyration (rx)	24.11 cm	9.491 in
Radius of gyration (ry)	13.98 cm	5.502 in