I 688x255x15.5x20 IAS · Weight & Dimensions

IAS, welded 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.

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Also known as: I 688x255x15.5x20 (México) · Doble T I 688x255x15.5x20 (Argentina / LATAM) · UB 688 (UK / Australia)

The I 688x255x15.5x20 steel profile weighs 158.9 kg/m (106.79 lb/ft), has a depth of 688 mm (27.09 in), flange width 255 mm (10.04 in). Cross-sectional area: 20,244 mm². Moment of inertia Ix = 148,967.085 cm⁴, Iy = 5,547.234 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	688 mm	27.09 in
Width (b)	255 mm	10.04 in
Web thickness (tw)	15.5 mm	0.61 in
Flange thickness (tf)	20 mm	0.79 in
Weight	158.9 kg/m	106.79 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	20,244 mm²	31.378 in²
Moment of inertia (Ix)	148,967.08 cm⁴	3578.93 in⁴
Moment of inertia (Iy)	5,547.23 cm⁴	133.27 in⁴
Elastic section modulus (Sx)	4,330.44 cm³	264.261 in³
Elastic section modulus (Sy)	435.08 cm³	26.550 in³
Plastic section modulus (Zx)	5,033.93 cm³	307.190 in³
Plastic section modulus (Zy)	689.17 cm³	42.056 in³
Radius of gyration (rx)	27.13 cm	10.680 in
Radius of gyration (ry)	5.23 cm	2.061 in