W 312 x 124,8 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 312 x 124,8 (México) · Doble T 312 x 124,8 (Argentina / LATAM) · UB 312 (UK / Australia)

The W 312 x 124,8 steel profile weighs 124.8 kg/m (83.88 lb/ft), has a depth of 312 mm (12.28 in), flange width 312 mm (12.28 in). Cross-sectional area: 15,874.022 mm². Moment of inertia Ix = 27,027.399 cm⁴, Iy = 8,822.812 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	312 mm	12.28 in
Width (b)	312 mm	12.28 in
Web thickness (tw)	17.4 mm	0.69 in
Flange thickness (tf)	17.4 mm	0.69 in
Fillet radius (r)	15 mm	0.59 in
Weight	124.8 kg/m	83.88 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	15,874.02 mm²	24.605 in²
Moment of inertia (Ix)	27,027.4 cm⁴	649.33 in⁴
Moment of inertia (Iy)	8,822.81 cm⁴	211.97 in⁴
Elastic section modulus (Sx)	1,732.53 cm³	105.726 in³
Elastic section modulus (Sy)	565.56 cm³	34.513 in³
Plastic section modulus (Zx)	1,959.7 cm³	119.589 in³
Plastic section modulus (Zy)	870.2 cm³	53.103 in³
Radius of gyration (rx)	13.05 cm	5.137 in
Radius of gyration (ry)	7.46 cm	2.935 in