CS 550x257 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 550x257 (México) · Doble T CS 550x257 (Argentina / LATAM) · UB 550 (UK / Australia)

The CS 550x257 steel profile weighs 256.9 kg/m (172.60 lb/ft), has a depth of 550 mm (21.65 in), flange width 550 mm (21.65 in). Cross-sectional area: 32,723.2 mm². Moment of inertia Ix = 188,765.966 cm⁴, Iy = 62,130.577 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)	22.4 mm	0.88 in
Weight	256.9 kg/m	172.60 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	32,723.2 mm²	50.721 in²
Moment of inertia (Ix)	188,765.97 cm⁴	4535.10 in⁴
Moment of inertia (Iy)	62,130.58 cm⁴	1492.69 in⁴
Elastic section modulus (Sx)	6,864.22 cm³	418.882 in³
Elastic section modulus (Sy)	2,259.29 cm³	137.871 in³
Plastic section modulus (Zx)	7,520.94 cm³	458.958 in³
Plastic section modulus (Zy)	3,420.33 cm³	208.722 in³
Radius of gyration (rx)	24.02 cm	9.456 in
Radius of gyration (ry)	13.78 cm	5.425 in