I 685.8x304.8x7.9x15.9 AHMSA · Weight & Dimensions

AHMSA, 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: I 685.8x304.8x7.9x15.9 (México) · Doble T I 685.8x304.8x7.9x15.9 (Argentina / LATAM) · UB 685.8 (UK / Australia)

The I 685.8x304.8x7.9x15.9 steel profile weighs 116.6 kg/m (78.38 lb/ft), has a depth of 685.8 mm (27.00 in), flange width 304.8 mm (12.00 in). Cross-sectional area: 14,859.24 mm². Moment of inertia Ix = 127,178.917 cm⁴, Iy = 7,506.651 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	685.8 mm	27.00 in
Width (b)	304.8 mm	12.00 in
Web thickness (tw)	7.9 mm	0.31 in
Flange thickness (tf)	15.9 mm	0.63 in
Weight	116.6 kg/m	78.38 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	14,859.24 mm²	23.032 in²
Moment of inertia (Ix)	127,178.92 cm⁴	3055.47 in⁴
Moment of inertia (Iy)	7,506.65 cm⁴	180.35 in⁴
Elastic section modulus (Sx)	3,708.92 cm³	226.333 in³
Elastic section modulus (Sy)	492.56 cm³	30.058 in³
Plastic section modulus (Zx)	4,091.29 cm³	249.667 in³
Plastic section modulus (Zy)	748.78 cm³	45.694 in³
Radius of gyration (rx)	29.26 cm	11.518 in
Radius of gyration (ry)	7.11 cm	2.798 in