I 685.8x304.8x7.9x12.7 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 685.8x304.8x7.9x12.7 (México) · Doble T I 685.8x304.8x7.9x12.7 (Argentina / LATAM) · UB 685.8 (UK / Australia)

The I 685.8x304.8x7.9x12.7 steel profile weighs 101.7 kg/m (68.36 lb/ft), has a depth of 685.8 mm (27.00 in), flange width 304.8 mm (12.00 in). Cross-sectional area: 12,959.08 mm². Moment of inertia Ix = 106,661.215 cm⁴, Iy = 5,996.446 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)	12.7 mm	0.50 in
Weight	101.7 kg/m	68.36 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	12,959.08 mm²	20.087 in²
Moment of inertia (Ix)	106,661.21 cm⁴	2562.54 in⁴
Moment of inertia (Iy)	5,996.45 cm⁴	144.06 in⁴
Elastic section modulus (Sx)	3,110.56 cm³	189.819 in³
Elastic section modulus (Sy)	393.47 cm³	24.011 in³
Plastic section modulus (Zx)	3,466.9 cm³	211.564 in³
Plastic section modulus (Zy)	600.24 cm³	36.629 in³
Radius of gyration (rx)	28.69 cm	11.295 in
Radius of gyration (ry)	6.8 cm	2.678 in