W 318 x 149,2 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 318 x 149,2 (México) · Doble T 318 x 149,2 (Argentina / LATAM) · UB 318.5 (UK / Australia)

The W 318 x 149,2 steel profile weighs 149.2 kg/m (100.23 lb/ft), has a depth of 318.5 mm (12.54 in), flange width 316 mm (12.44 in). Cross-sectional area: 18,988.986 mm². Moment of inertia Ix = 33,066.963 cm⁴, Iy = 10,910.368 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	318.5 mm	12.54 in
Width (b)	316 mm	12.44 in
Web thickness (tw)	20.6 mm	0.81 in
Flange thickness (tf)	20.7 mm	0.81 in
Fillet radius (r)	15.2 mm	0.60 in
Weight	149.2 kg/m	100.23 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	18,988.99 mm²	29.433 in²
Moment of inertia (Ix)	33,066.96 cm⁴	794.43 in⁴
Moment of inertia (Iy)	10,910.37 cm⁴	262.12 in⁴
Elastic section modulus (Sx)	2,076.42 cm³	126.711 in³
Elastic section modulus (Sy)	690.53 cm³	42.139 in³
Plastic section modulus (Zx)	2,370.21 cm³	144.640 in³
Plastic section modulus (Zy)	1,065.62 cm³	65.029 in³
Radius of gyration (rx)	13.2 cm	5.195 in
Radius of gyration (ry)	7.58 cm	2.984 in