UB 305x102x33 · Weight & Dimensions

EN — 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: UB 305x102x33 (México) · Doble T UB 305x102x33 (Argentina / LATAM) · UB 312.7 (UK / Australia)

The UB 305x102x33 steel profile weighs 32.8 kg/m (22.04 lb/ft), has a depth of 312.7 mm (12.31 in), flange width 102.4 mm (4.03 in). Cross-sectional area: 4,133.1 mm². Moment of inertia Ix = 6,398.74 cm⁴, Iy = 193.97 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	312.7 mm	12.31 in
Width (b)	102.4 mm	4.03 in
Web thickness (tw)	6.6 mm	0.26 in
Flange thickness (tf)	10.8 mm	0.43 in
Fillet radius (r)	7.6 mm	0.30 in
Weight	32.8 kg/m	22.04 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	4,133.1 mm²	6.406 in²
Moment of inertia (Ix)	6,398.74 cm⁴	153.73 in⁴
Moment of inertia (Iy)	193.97 cm⁴	4.66 in⁴
Elastic section modulus (Sx)	409.26 cm³	24.975 in³
Elastic section modulus (Sy)	37.88 cm³	2.312 in³
Plastic section modulus (Zx)	473.7 cm³	28.907 in³
Plastic section modulus (Zy)	59.79 cm³	3.649 in³
Radius of gyration (rx)	12.44 cm	4.898 in
Radius of gyration (ry)	2.17 cm	0.854 in