I 685.8x203.2x7.9x12.7 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 685.8x203.2x7.9x12.7 (México) · Doble T I 685.8x203.2x7.9x12.7 (Argentina / LATAM) · UB 685.8 (UK / Australia)

The I 685.8x203.2x7.9x12.7 steel profile weighs 81.5 kg/m (54.75 lb/ft), has a depth of 685.8 mm (27.00 in), flange width 203.2 mm (8.00 in). Cross-sectional area: 10,378.44 mm². Moment of inertia Ix = 77,427.894 cm⁴, Iy = 1,778.634 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	685.8 mm	27.00 in
Width (b)	203.2 mm	8.00 in
Web thickness (tw)	7.9 mm	0.31 in
Flange thickness (tf)	12.7 mm	0.50 in
Weight	81.5 kg/m	54.75 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	10,378.44 mm²	16.087 in²
Moment of inertia (Ix)	77,427.89 cm⁴	1860.21 in⁴
Moment of inertia (Iy)	1,778.63 cm⁴	42.73 in⁴
Elastic section modulus (Sx)	2,258.03 cm³	137.794 in³
Elastic section modulus (Sy)	175.06 cm³	10.683 in³
Plastic section modulus (Zx)	2,598.38 cm³	158.564 in³
Plastic section modulus (Zy)	272.5 cm³	16.629 in³
Radius of gyration (rx)	27.31 cm	10.753 in
Radius of gyration (ry)	4.14 cm	1.630 in