W 840 x 251,0 CISC · Weight & Dimensions

CISC, 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 840 x 251,0 (México) · Doble T 840 x 251,0 (Argentina / LATAM) · UB 859 (UK / Australia)

The W 840 x 251,0 steel profile weighs 250.4 kg/m (168.28 lb/ft), has a depth of 859 mm (33.82 in), flange width 292 mm (11.50 in). Cross-sectional area: 31,931.124 mm². Moment of inertia Ix = 386,489.006 cm⁴, Iy = 12,900.803 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	859 mm	33.82 in
Width (b)	292 mm	11.50 in
Web thickness (tw)	17 mm	0.67 in
Flange thickness (tf)	31 mm	1.22 in
Fillet radius (r)	18 mm	0.71 in
Weight	250.4 kg/m	168.28 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	31,931.12 mm²	49.493 in²
Moment of inertia (Ix)	386,489.01 cm⁴	9285.40 in⁴
Moment of inertia (Iy)	12,900.8 cm⁴	309.94 in⁴
Elastic section modulus (Sx)	8,998.58 cm³	549.129 in³
Elastic section modulus (Sy)	883.62 cm³	53.922 in³
Plastic section modulus (Zx)	10,304.41 cm³	628.816 in³
Plastic section modulus (Zy)	1,382.66 cm³	84.375 in³
Radius of gyration (rx)	34.79 cm	13.697 in
Radius of gyration (ry)	6.36 cm	2.502 in