W 346 x 109,1 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 346 x 109,1 (México) · Doble T 346 x 109,1 (Argentina / LATAM) · UB 346.4 (UK / Australia)

The W 346 x 109,1 steel profile weighs 109.1 kg/m (73.33 lb/ft), has a depth of 346.4 mm (13.64 in), flange width 371 mm (14.61 in). Cross-sectional area: 13,873.806 mm². Moment of inertia Ix = 30,631.576 cm⁴, Iy = 10,986.601 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	346.4 mm	13.64 in
Width (b)	371 mm	14.61 in
Web thickness (tw)	12.8 mm	0.50 in
Flange thickness (tf)	12.9 mm	0.51 in
Fillet radius (r)	15.2 mm	0.60 in
Weight	109.1 kg/m	73.33 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	13,873.81 mm²	21.504 in²
Moment of inertia (Ix)	30,631.58 cm⁴	735.92 in⁴
Moment of inertia (Iy)	10,986.6 cm⁴	263.95 in⁴
Elastic section modulus (Sx)	1,768.57 cm³	107.925 in³
Elastic section modulus (Sy)	592.27 cm³	36.143 in³
Plastic section modulus (Zx)	1,956.13 cm³	119.371 in³
Plastic section modulus (Zy)	902.86 cm³	55.096 in³
Radius of gyration (rx)	14.86 cm	5.850 in
Radius of gyration (ry)	8.9 cm	3.503 in