W 343 x 109,7 GOST · Weight & Dimensions

GOST, 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 343 x 109,7 (México) · Doble T 343 x 109,7 (Argentina / LATAM) · UB 343 (UK / Australia)

The W 343 x 109,7 steel profile weighs 109.7 kg/m (73.69 lb/ft), has a depth of 343 mm (13.50 in), flange width 350 mm (13.78 in). Cross-sectional area: 13,973.363 mm². Moment of inertia Ix = 31,609.975 cm⁴, Iy = 10,724.919 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	343 mm	13.50 in
Width (b)	350 mm	13.78 in
Web thickness (tw)	10 mm	0.39 in
Flange thickness (tf)	15 mm	0.59 in
Fillet radius (r)	20 mm	0.79 in
Weight	109.7 kg/m	73.69 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	13,973.36 mm²	21.659 in²
Moment of inertia (Ix)	31,609.97 cm⁴	759.43 in⁴
Moment of inertia (Iy)	10,724.92 cm⁴	257.67 in⁴
Elastic section modulus (Sx)	1,843.15 cm³	112.476 in³
Elastic section modulus (Sy)	612.85 cm³	37.399 in³
Plastic section modulus (Zx)	2,019.12 cm³	123.215 in³
Plastic section modulus (Zy)	929.83 cm³	56.742 in³
Radius of gyration (rx)	15.04 cm	5.921 in
Radius of gyration (ry)	8.76 cm	3.449 in