W 551 x 181,8 IMCA · Weight & Dimensions

IMCA, 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 551 x 181,8 (México) · Doble T 551 x 181,8 (Argentina / LATAM) · UB 551 (UK / Australia)

The W 551 x 181,8 steel profile weighs 181.8 kg/m (122.18 lb/ft), has a depth of 551 mm (21.69 in), flange width 315 mm (12.40 in). Cross-sectional area: 23,005.44 mm². Moment of inertia Ix = 122,688.815 cm⁴, Iy = 12,725.419 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	551 mm	21.69 in
Width (b)	315 mm	12.40 in
Web thickness (tw)	15.2 mm	0.60 in
Flange thickness (tf)	24.4 mm	0.96 in
Weight	181.8 kg/m	122.18 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	23,005.44 mm²	35.658 in²
Moment of inertia (Ix)	122,688.82 cm⁴	2947.60 in⁴
Moment of inertia (Iy)	12,725.42 cm⁴	305.73 in⁴
Elastic section modulus (Sx)	4,453.31 cm³	271.759 in³
Elastic section modulus (Sy)	807.96 cm³	49.305 in³
Plastic section modulus (Zx)	5,005.83 cm³	305.476 in³
Plastic section modulus (Zy)	1,239.55 cm³	75.642 in³
Radius of gyration (rx)	23.09 cm	9.092 in
Radius of gyration (ry)	7.44 cm	2.928 in