W 310 x 129,0 CISC · Weight & Dimensions

CISC, 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 310 x 129,0 (México) · Doble T 310 x 129,0 (Argentina / LATAM) · UB 318 (UK / Australia)

The W 310 x 129,0 steel profile weighs 129.5 kg/m (87.04 lb/ft), has a depth of 318 mm (12.52 in), flange width 308 mm (12.13 in). Cross-sectional area: 16,508.822 mm². Moment of inertia Ix = 30,771.335 cm⁴, Iy = 10,038.783 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	318 mm	12.52 in
Width (b)	308 mm	12.13 in
Web thickness (tw)	13.1 mm	0.52 in
Flange thickness (tf)	20.6 mm	0.81 in
Fillet radius (r)	15 mm	0.59 in
Weight	129.5 kg/m	87.04 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	16,508.82 mm²	25.589 in²
Moment of inertia (Ix)	30,771.34 cm⁴	739.28 in⁴
Moment of inertia (Iy)	10,038.78 cm⁴	241.18 in⁴
Elastic section modulus (Sx)	1,935.3 cm³	118.100 in³
Elastic section modulus (Sy)	651.87 cm³	39.780 in³
Plastic section modulus (Zx)	2,163.95 cm³	132.053 in³
Plastic section modulus (Zy)	990.89 cm³	60.468 in³
Radius of gyration (rx)	13.65 cm	5.375 in
Radius of gyration (ry)	7.8 cm	3.070 in