2L3-1/2×3×1/4×3/4LLBB double angle

Detailing dimensions and section properties from the AISC Shapes Database, 16th Edition. Values are shown to the nearest 1/16 in. as they appear on a shop drawing.

2L3-1/2×3×1/4×3/4LLBB has a 3 1/2 in. long leg and a 3 in. short leg, 1/4 in. thick, in contact back to back.

It is a double angle set with its long legs back-to-back.

It weighs 10.8 lb per foot.

For strong-axis bending its section modulus is Sx = 1.55 in³ and its moment of inertia Ix = 3.84 in⁴, with a plastic modulus Zx = 2.78 in³.

Detailing dimensions

Long leg3 1/2"
Short leg3"
Thickness (t)1/4"

Section properties

Weight10.8 lb/ft
Area (A)3.16 in²
Ix3.84 in⁴
Sx1.55 in³
Zx2.78 in³
rx1.1 in
Iy6.74 in⁴
Sy2 in³
Zy3.63 in³
ry1.46 in

Similar weight double angles

Comparable 10.8 lb/ft sections in other double angle sizes.

2L3-1/2×3×1/4LLBB10.8 lb/ft · Sx 1.55 in³2L3-1/2×3×1/4×3/8LLBB10.8 lb/ft · Sx 1.55 in³2L3-1/2×3×1/4SLBB10.8 lb/ft · Sx 1.17 in³2L3-1/2×3×1/4×3/8SLBB10.8 lb/ft · Sx 1.17 in³2L3-1/2×3×1/4×3/4SLBB10.8 lb/ft · Sx 1.17 in³2L2-1/2×2×3/8LLBB10.6 lb/ft · Sx 1.09 in³2L2-1/2×2×3/8×3/8LLBB10.6 lb/ft · Sx 1.09 in³2L2-1/2×2×3/8×3/4LLBB10.6 lb/ft · Sx 1.09 in³

Detailing values are rounded to the nearest 1/16 in. per the AISC Steel Construction Manual. Verify critical dimensions against the current Manual before fabrication. Need 2L3-1/2×3×1/4×3/4LLBB cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Double angles · Steel Beam Size Chart

Interactive drawing