I 400x400x20x30 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 400x400x20x30 (México) · Doble T I 400x400x20x30 (Argentina / LATAM) · UB 400 (UK / Australia)

The I 400x400x20x30 steel profile weighs 241.8 kg/m (162.48 lb/ft), has a depth of 400 mm (15.75 in), flange width 400 mm (15.75 in). Cross-sectional area: 30,800 mm². Moment of inertia Ix = 88,870.667 cm⁴, Iy = 32,022.667 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	400 mm	15.75 in
Width (b)	400 mm	15.75 in
Web thickness (tw)	20 mm	0.79 in
Flange thickness (tf)	30 mm	1.18 in
Weight	241.8 kg/m	162.48 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	30,800 mm²	47.740 in²
Moment of inertia (Ix)	88,870.67 cm⁴	2135.12 in⁴
Moment of inertia (Iy)	32,022.67 cm⁴	769.34 in⁴
Elastic section modulus (Sx)	4,443.53 cm³	271.162 in³
Elastic section modulus (Sy)	1,601.13 cm³	97.708 in³
Plastic section modulus (Zx)	5,018 cm³	306.218 in³
Plastic section modulus (Zy)	2,434 cm³	148.532 in³
Radius of gyration (rx)	16.99 cm	6.688 in
Radius of gyration (ry)	10.2 cm	4.014 in