I 400x400x18x35 Cintac · Weight & Dimensions

Cintac, 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 400x400x18x35 (México) · Doble T I 400x400x18x35 (Argentina / LATAM) · UB 400 (UK / Australia)

The I 400x400x18x35 steel profile weighs 266.4 kg/m (179.04 lb/ft), has a depth of 400 mm (15.75 in), flange width 400 mm (15.75 in). Cross-sectional area: 33,940 mm². Moment of inertia Ix = 98,933.883 cm⁴, Iy = 37,349.371 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)	18 mm	0.71 in
Flange thickness (tf)	35 mm	1.38 in
Weight	266.4 kg/m	179.04 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	33,940 mm²	52.607 in²
Moment of inertia (Ix)	98,933.88 cm⁴	2376.89 in⁴
Moment of inertia (Iy)	37,349.37 cm⁴	897.32 in⁴
Elastic section modulus (Sx)	4,946.69 cm³	301.867 in³
Elastic section modulus (Sy)	1,867.47 cm³	113.960 in³
Plastic section modulus (Zx)	5,600.05 cm³	341.737 in³
Plastic section modulus (Zy)	2,826.73 cm³	172.498 in³
Radius of gyration (rx)	17.07 cm	6.722 in
Radius of gyration (ry)	10.49 cm	4.130 in