I 390x300x12.5x20 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 390x300x12.5x20 (México) · Doble T I 390x300x12.5x20 (Argentina / LATAM) · UB 390 (UK / Australia)

The I 390x300x12.5x20 steel profile weighs 128.0 kg/m (85.98 lb/ft), has a depth of 390 mm (15.35 in), flange width 300 mm (11.81 in). Cross-sectional area: 16,375 mm². Moment of inertia Ix = 45,576.146 cm⁴, Iy = 9,005.697 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	390 mm	15.35 in
Width (b)	300 mm	11.81 in
Web thickness (tw)	12.5 mm	0.49 in
Flange thickness (tf)	20 mm	0.79 in
Weight	128.0 kg/m	85.98 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	16,375 mm²	25.381 in²
Moment of inertia (Ix)	45,576.15 cm⁴	1094.97 in⁴
Moment of inertia (Iy)	9,005.7 cm⁴	216.36 in⁴
Elastic section modulus (Sx)	2,337.24 cm³	142.628 in³
Elastic section modulus (Sy)	600.38 cm³	36.638 in³
Plastic section modulus (Zx)	2,602.81 cm³	158.834 in³
Plastic section modulus (Zy)	913.67 cm³	55.756 in³
Radius of gyration (rx)	16.68 cm	6.568 in
Radius of gyration (ry)	7.42 cm	2.920 in