W 261 x 31,2 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 261 x 31,2 (México) · Doble T 261 x 31,2 (Argentina / LATAM) · UB 261 (UK / Australia)

The W 261 x 31,2 steel profile weighs 31.2 kg/m (20.94 lb/ft), has a depth of 261 mm (10.28 in), flange width 120 mm (4.72 in). Cross-sectional area: 3,969.611 mm². Moment of inertia Ix = 4,653.588 cm⁴, Iy = 288.895 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	261 mm	10.28 in
Width (b)	120 mm	4.72 in
Web thickness (tw)	6 mm	0.24 in
Flange thickness (tf)	10 mm	0.39 in
Fillet radius (r)	12 mm	0.47 in
Weight	31.2 kg/m	20.94 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	3,969.61 mm²	6.153 in²
Moment of inertia (Ix)	4,653.59 cm⁴	111.80 in⁴
Moment of inertia (Iy)	288.9 cm⁴	6.94 in⁴
Elastic section modulus (Sx)	356.6 cm³	21.761 in³
Elastic section modulus (Sy)	48.15 cm³	2.938 in³
Plastic section modulus (Zx)	402.89 cm³	24.586 in³
Plastic section modulus (Zy)	74.87 cm³	4.569 in³
Radius of gyration (rx)	10.83 cm	4.263 in
Radius of gyration (ry)	2.7 cm	1.062 in