I 1800x550x20x35 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 1800x550x20x35 (México) · Doble T I 1800x550x20x35 (Argentina / LATAM) · UB 1800 (UK / Australia)

The I 1800x550x20x35 steel profile weighs 573.8 kg/m (385.62 lb/ft), has a depth of 1800 mm (70.87 in), flange width 550 mm (21.65 in). Cross-sectional area: 73,100 mm². Moment of inertia Ix = 3,861,749.917 cm⁴, Iy = 97,167.417 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)	35 mm	1.38 in
Weight	573.8 kg/m	385.62 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	73,100 mm²	113.305 in²
Moment of inertia (Ix)	3,861,749.92 cm⁴	92778.54 in⁴
Moment of inertia (Iy)	97,167.42 cm⁴	2334.45 in⁴
Elastic section modulus (Sx)	42,908.33 cm³	2618.438 in³
Elastic section modulus (Sy)	3,533.36 cm³	215.620 in³
Plastic section modulus (Zx)	48,940.75 cm³	2986.560 in³
Plastic section modulus (Zy)	5,466.75 cm³	333.603 in³
Radius of gyration (rx)	72.68 cm	28.615 in
Radius of gyration (ry)	11.53 cm	4.539 in