VS 400x78 Usiminas · Weight & Dimensions

Usiminas, 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.

Also known as: VS 400x78 (México) · Doble T VS 400x78 (Argentina / LATAM) · UB 400 (UK / Australia)

The VS 400x78 steel profile weighs 77.6 kg/m (52.12 lb/ft), has a depth of 400 mm (15.75 in), flange width 200 mm (7.87 in). Cross-sectional area: 9,880.6 mm². Moment of inertia Ix = 30,093.945 cm⁴, Iy = 2,534.088 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	400 mm	15.75 in
Width (b)	200 mm	7.87 in
Web thickness (tw)	6.3 mm	0.25 in
Flange thickness (tf)	19 mm	0.75 in
Weight	77.6 kg/m	52.12 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	9,880.6 mm²	15.315 in²
Moment of inertia (Ix)	30,093.94 cm⁴	723.01 in⁴
Moment of inertia (Iy)	2,534.09 cm⁴	60.88 in⁴
Elastic section modulus (Sx)	1,504.7 cm³	91.823 in³
Elastic section modulus (Sy)	253.41 cm³	15.464 in³
Plastic section modulus (Zx)	1,654.19 cm³	100.946 in³
Plastic section modulus (Zy)	383.59 cm³	23.408 in³
Radius of gyration (rx)	17.45 cm	6.871 in
Radius of gyration (ry)	5.06 cm	1.994 in