2L4×3-1/2×1/2LLBB 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.

2L4×3-1/2×1/2LLBB has a 4 in. long leg and a 3 1/2 in. short leg, 1/2 in. thick, in contact back to back.

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

It weighs 23.8 lb per foot.

For strong-axis bending its section modulus is Sx = 3.84 in³ and its moment of inertia Ix = 10.6 in⁴, with a plastic modulus Zx = 6.92 in³.

Detailing dimensions

Long leg4"
Short leg3 1/2"
Thickness (t)1/2"

Section properties

Weight23.8 lb/ft
Area (A)7 in²
Ix10.6 in⁴
Sx3.84 in³
Zx6.92 in³
rx1.23 in
Iy14.5 in⁴
Sy4.14 in³
Zy6.96 in³
ry1.44 in

Similar weight double angles

Comparable 23.8 lb/ft sections in other double angle sizes.

2L4×3-1/2×1/2×3/8LLBB23.8 lb/ft · Sx 3.84 in³2L4×3-1/2×1/2×3/4LLBB23.8 lb/ft · Sx 3.84 in³2L4×3-1/2×1/2SLBB23.8 lb/ft · Sx 3 in³2L4×3-1/2×1/2×3/8SLBB23.8 lb/ft · Sx 3 in³2L4×3-1/2×1/2×3/4SLBB23.8 lb/ft · Sx 3 in³2L6×3-1/2×3/8LLBB23.4 lb/ft · Sx 6.46 in³2L6×3-1/2×3/8×3/8LLBB23.4 lb/ft · Sx 6.46 in³2L6×3-1/2×3/8×3/4LLBB23.4 lb/ft · Sx 6.46 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 2L4×3-1/2×1/2LLBB cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Double angles · Steel Beam Size Chart

Interactive drawing