W 990 x 272,4 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 990 x 272,4 (México) · Doble T 990 x 272,4 (Argentina / LATAM) · UB 990.1 (UK / Australia)

The W 990 x 272,4 steel profile weighs 272.4 kg/m (183.05 lb/ft), has a depth of 990.1 mm (38.98 in), flange width 300 mm (11.81 in). Cross-sectional area: 34,686.217 mm². Moment of inertia Ix = 553,974.489 cm⁴, Iy = 14,004.457 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	990.1 mm	38.98 in
Width (b)	300 mm	11.81 in
Web thickness (tw)	16.5 mm	0.65 in
Flange thickness (tf)	31 mm	1.22 in
Fillet radius (r)	30 mm	1.18 in
Weight	272.4 kg/m	183.05 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	34,686.22 mm²	53.764 in²
Moment of inertia (Ix)	553,974.49 cm⁴	13309.24 in⁴
Moment of inertia (Iy)	14,004.46 cm⁴	336.46 in⁴
Elastic section modulus (Sx)	11,190.27 cm³	682.875 in³
Elastic section modulus (Sy)	933.63 cm³	56.974 in³
Plastic section modulus (Zx)	12,826.11 cm³	782.701 in³
Plastic section modulus (Zy)	1,469.72 cm³	89.688 in³
Radius of gyration (rx)	39.96 cm	15.734 in
Radius of gyration (ry)	6.35 cm	2.502 in