2L3-1/2×2-1/2×1/4×3/4LLBB 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.

2L3-1/2×2-1/2×1/4×3/4LLBB has a 3 1/2 in. long leg and a 2 1/2 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 9.8 lb per foot.

For strong-axis bending its section modulus is Sx = 1.51 in³ and its moment of inertia Ix = 3.62 in⁴, with a plastic modulus Zx = 2.72 in³.

Detailing dimensions

Long leg3 1/2"
Short leg2 1/2"
Thickness (t)1/4"

Section properties

Weight9.8 lb/ft
Area (A)2.9 in²
Ix3.62 in⁴
Sx1.51 in³
Zx2.72 in³
rx1.12 in
Iy4.32 in⁴
Sy1.5 in³
Zy2.85 in³
ry1.22 in

Similar weight double angles

Comparable 9.8 lb/ft sections in other double angle sizes.

2L3×3×1/49.8 lb/ft · Sx 1.14 in³2L3×3×1/4×3/89.8 lb/ft · Sx 1.14 in³2L3×3×1/4×3/49.8 lb/ft · Sx 1.14 in³2L3-1/2×2-1/2×1/4LLBB9.8 lb/ft · Sx 1.51 in³2L3-1/2×2-1/2×1/4×3/8LLBB9.8 lb/ft · Sx 1.51 in³2L3-1/2×2-1/2×1/4SLBB9.8 lb/ft · Sx 0.819 in³2L3-1/2×2-1/2×1/4×3/8SLBB9.8 lb/ft · Sx 0.819 in³2L3-1/2×2-1/2×1/4×3/4SLBB9.8 lb/ft · Sx 0.819 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 2L3-1/2×2-1/2×1/4×3/4LLBB cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Double angles · Steel Beam Size Chart

Interactive drawing