W 312 x 126,4 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 312 x 126,4 (México) · Doble T 312 x 126,4 (Argentina / LATAM) · UB 312.3 (UK / Australia)

The W 312 x 126,4 steel profile weighs 126.4 kg/m (84.93 lb/ft), has a depth of 312.3 mm (12.30 in), flange width 312.9 mm (12.32 in). Cross-sectional area: 16,061.656 mm². Moment of inertia Ix = 27,407.557 cm⁴, Iy = 9,001.704 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	312.3 mm	12.30 in
Width (b)	312.9 mm	12.32 in
Web thickness (tw)	17.5 mm	0.69 in
Flange thickness (tf)	17.6 mm	0.69 in
Fillet radius (r)	15.2 mm	0.60 in
Weight	126.4 kg/m	84.93 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	16,061.66 mm²	24.896 in²
Moment of inertia (Ix)	27,407.56 cm⁴	658.47 in⁴
Moment of inertia (Iy)	9,001.7 cm⁴	216.27 in⁴
Elastic section modulus (Sx)	1,755.21 cm³	107.110 in³
Elastic section modulus (Sy)	575.37 cm³	35.112 in³
Plastic section modulus (Zx)	1,985.66 cm³	121.173 in³
Plastic section modulus (Zy)	885.2 cm³	54.018 in³
Radius of gyration (rx)	13.06 cm	5.143 in
Radius of gyration (ry)	7.49 cm	2.947 in