W 299 x 78,5 British Steel · Weight & Dimensions

British Steel, 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 299 x 78,5 (México) · Doble T 299 x 78,5 (Argentina / LATAM) · UB 299.3 (UK / Australia)

The W 299 x 78,5 steel profile weighs 78.5 kg/m (52.75 lb/ft), has a depth of 299.3 mm (11.78 in), flange width 306.4 mm (12.06 in). Cross-sectional area: 10,048.506 mm². Moment of inertia Ix = 16,444.202 cm⁴, Iy = 5,326.352 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	299.3 mm	11.78 in
Width (b)	306.4 mm	12.06 in
Web thickness (tw)	11 mm	0.43 in
Flange thickness (tf)	11.1 mm	0.44 in
Fillet radius (r)	15.2 mm	0.60 in
Weight	78.5 kg/m	52.75 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	10,048.51 mm²	15.575 in²
Moment of inertia (Ix)	16,444.2 cm⁴	395.07 in⁴
Moment of inertia (Iy)	5,326.35 cm⁴	127.97 in⁴
Elastic section modulus (Sx)	1,098.84 cm³	67.056 in³
Elastic section modulus (Sy)	347.67 cm³	21.216 in³
Plastic section modulus (Zx)	1,218.14 cm³	74.336 in³
Plastic section modulus (Zy)	531.19 cm³	32.415 in³
Radius of gyration (rx)	12.79 cm	5.036 in
Radius of gyration (ry)	7.28 cm	2.866 in