I 350x350x20x40 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 350x350x20x40 (México) · Doble T I 350x350x20x40 (Argentina / LATAM) · UB 350 (UK / Australia)

The I 350x350x20x40 steel profile weighs 262.2 kg/m (176.19 lb/ft), has a depth of 350 mm (13.78 in), flange width 350 mm (13.78 in). Cross-sectional area: 33,400 mm². Moment of inertia Ix = 70,923.833 cm⁴, Iy = 28,601.333 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	350 mm	13.78 in
Width (b)	350 mm	13.78 in
Web thickness (tw)	20 mm	0.79 in
Flange thickness (tf)	40 mm	1.57 in
Weight	262.2 kg/m	176.19 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	33,400 mm²	51.770 in²
Moment of inertia (Ix)	70,923.83 cm⁴	1703.95 in⁴
Moment of inertia (Iy)	28,601.33 cm⁴	687.15 in⁴
Elastic section modulus (Sx)	4,052.79 cm³	247.317 in³
Elastic section modulus (Sy)	1,634.36 cm³	99.735 in³
Plastic section modulus (Zx)	4,704.5 cm³	287.087 in³
Plastic section modulus (Zy)	2,477 cm³	151.156 in³
Radius of gyration (rx)	14.57 cm	5.737 in
Radius of gyration (ry)	9.25 cm	3.643 in