W 318 x 129,7 IMCA · Weight & Dimensions

IMCA, hot-rolled 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: IPR 318 x 129,7 (México) · Doble T 318 x 129,7 (Argentina / LATAM) · UB 318 (UK / Australia)

The W 318 x 129,7 steel profile weighs 129.7 kg/m (87.14 lb/ft), has a depth of 318 mm (12.52 in), flange width 308 mm (12.13 in). Cross-sectional area: 16,315.68 mm². Moment of inertia Ix = 30,418.924 cm⁴, Iy = 10,036.737 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	318 mm	12.52 in
Width (b)	308 mm	12.13 in
Web thickness (tw)	13.1 mm	0.52 in
Flange thickness (tf)	20.6 mm	0.81 in
Weight	129.7 kg/m	87.14 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	16,315.68 mm²	25.289 in²
Moment of inertia (Ix)	30,418.92 cm⁴	730.81 in⁴
Moment of inertia (Iy)	10,036.74 cm⁴	241.13 in⁴
Elastic section modulus (Sx)	1,913.14 cm³	116.747 in³
Elastic section modulus (Sy)	651.74 cm³	39.772 in³
Plastic section modulus (Zx)	2,137.87 cm³	130.461 in³
Plastic section modulus (Zy)	988.97 cm³	60.351 in³
Radius of gyration (rx)	13.65 cm	5.376 in
Radius of gyration (ry)	7.84 cm	3.088 in