I 1800x550x20x50 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 1800x550x20x50 (México) · Doble T I 1800x550x20x50 (Argentina / LATAM) · UB 1800 (UK / Australia)

The I 1800x550x20x50 steel profile weighs 698.6 kg/m (469.49 lb/ft), has a depth of 1800 mm (70.87 in), flange width 550 mm (21.65 in). Cross-sectional area: 89,000 mm². Moment of inertia Ix = 5,030,916.667 cm⁴, Iy = 138,759.167 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	1800 mm	70.87 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	698.6 kg/m	469.49 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	89,000 mm²	137.950 in²
Moment of inertia (Ix)	5,030,916.67 cm⁴	120867.77 in⁴
Moment of inertia (Iy)	138,759.17 cm⁴	3333.69 in⁴
Elastic section modulus (Sx)	55,899.07 cm³	3411.185 in³
Elastic section modulus (Sy)	5,045.79 cm³	307.914 in³
Plastic section modulus (Zx)	62,575 cm³	3818.577 in³
Plastic section modulus (Zy)	7,732.5 cm³	471.868 in³
Radius of gyration (rx)	75.18 cm	29.600 in
Radius of gyration (ry)	12.49 cm	4.916 in