W 998 x 258,2 GOST · Weight & Dimensions

GOST, 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 998 x 258,2 (México) · Doble T 998 x 258,2 (Argentina / LATAM) · UB 998 (UK / Australia)

The W 998 x 258,2 steel profile weighs 258.2 kg/m (173.50 lb/ft), has a depth of 998 mm (39.29 in), flange width 320 mm (12.60 in). Cross-sectional area: 32,888.567 mm². Moment of inertia Ix = 516,343.732 cm⁴, Iy = 13,712.442 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	998 mm	39.29 in
Width (b)	320 mm	12.60 in
Web thickness (tw)	17 mm	0.67 in
Flange thickness (tf)	25 mm	0.98 in
Fillet radius (r)	30 mm	1.18 in
Weight	258.2 kg/m	173.50 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	32,888.57 mm²	50.977 in²
Moment of inertia (Ix)	516,343.73 cm⁴	12405.16 in⁴
Moment of inertia (Iy)	13,712.44 cm⁴	329.44 in⁴
Elastic section modulus (Sx)	10,347.57 cm³	631.450 in³
Elastic section modulus (Sy)	857.03 cm³	52.299 in³
Plastic section modulus (Zx)	11,964.51 cm³	730.122 in³
Plastic section modulus (Zy)	1,360.24 cm³	83.007 in³
Radius of gyration (rx)	39.62 cm	15.600 in
Radius of gyration (ry)	6.46 cm	2.542 in