W 128 x 18,1 Arval · Weight & Dimensions

Arval, 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 128 x 18,1 (México) · Doble T 128 x 18,1 (Argentina / LATAM) · UB 128 (UK / Australia)

The W 128 x 18,1 steel profile weighs 18.1 kg/m (12.13 lb/ft), has a depth of 128 mm (5.04 in), flange width 140 mm (5.51 in). Cross-sectional area: 2,302.411 mm². Moment of inertia Ix = 719.455 cm⁴, Iy = 274.828 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	128 mm	5.04 in
Width (b)	140 mm	5.51 in
Web thickness (tw)	4.3 mm	0.17 in
Flange thickness (tf)	6 mm	0.24 in
Fillet radius (r)	12 mm	0.47 in
Weight	18.1 kg/m	12.13 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	2,302.41 mm²	3.569 in²
Moment of inertia (Ix)	719.45 cm⁴	17.28 in⁴
Moment of inertia (Iy)	274.83 cm⁴	6.60 in⁴
Elastic section modulus (Sx)	112.41 cm³	6.860 in³
Elastic section modulus (Sy)	39.26 cm³	2.396 in³
Plastic section modulus (Zx)	123.78 cm³	7.554 in³
Plastic section modulus (Zy)	59.93 cm³	3.657 in³
Radius of gyration (rx)	5.59 cm	2.201 in
Radius of gyration (ry)	3.45 cm	1.360 in