I 400x400x12x18 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 400x400x12x18 (México) · Doble T I 400x400x12x18 (Argentina / LATAM) · UB 400 (UK / Australia)

The I 400x400x12x18 steel profile weighs 147.3 kg/m (99.01 lb/ft), has a depth of 400 mm (15.75 in), flange width 400 mm (15.75 in). Cross-sectional area: 18,768 mm². Moment of inertia Ix = 57,394.374 cm⁴, Iy = 19,205.242 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)	12 mm	0.47 in
Flange thickness (tf)	18 mm	0.71 in
Weight	147.3 kg/m	99.01 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	18,768 mm²	29.090 in²
Moment of inertia (Ix)	57,394.37 cm⁴	1378.90 in⁴
Moment of inertia (Iy)	19,205.24 cm⁴	461.41 in⁴
Elastic section modulus (Sx)	2,869.72 cm³	175.122 in³
Elastic section modulus (Sy)	960.26 cm³	58.599 in³
Plastic section modulus (Zx)	3,147.89 cm³	192.097 in³
Plastic section modulus (Zy)	1,453.1 cm³	88.674 in³
Radius of gyration (rx)	17.49 cm	6.885 in
Radius of gyration (ry)	10.12 cm	3.983 in