I 400x400x11x20 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 400x400x11x20 (México) · Doble T I 400x400x11x20 (Argentina / LATAM) · UB 400 (UK / Australia)

The I 400x400x11x20 steel profile weighs 156.7 kg/m (105.30 lb/ft), has a depth of 400 mm (15.75 in), flange width 400 mm (15.75 in). Cross-sectional area: 19,960 mm². Moment of inertia Ix = 62,090.133 cm⁴, Iy = 21,337.326 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)	11 mm	0.43 in
Flange thickness (tf)	20 mm	0.79 in
Weight	156.7 kg/m	105.30 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	19,960 mm²	30.938 in²
Moment of inertia (Ix)	62,090.13 cm⁴	1491.72 in⁴
Moment of inertia (Iy)	21,337.33 cm⁴	512.63 in⁴
Elastic section modulus (Sx)	3,104.51 cm³	189.449 in³
Elastic section modulus (Sy)	1,066.87 cm³	65.104 in³
Plastic section modulus (Zx)	3,396.4 cm³	207.262 in³
Plastic section modulus (Zy)	1,610.89 cm³	98.303 in³
Radius of gyration (rx)	17.64 cm	6.944 in
Radius of gyration (ry)	10.34 cm	4.071 in