2L8×4×1LLBB 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.

2L8×4×1LLBB has a 8 in. long leg and a 4 in. short leg, 1 in. thick, in contact back to back.

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

At 74.8 lb per foot it is one of the 42 2L8×4 sizes, which run from 34.4 to 74.8 lb/ft.

For strong-axis bending its section modulus is Sx = 28 in³ and its moment of inertia Ix = 139 in⁴, with a plastic modulus Zx = 48.6 in³.

Detailing dimensions

Long leg8"
Short leg4"
Thickness (t)1"

Section properties

Weight74.8 lb/ft
Area (A)22.2 in²
Ix139 in⁴
Sx28 in³
Zx48.6 in³
rx2.51 in
Iy47.3 in⁴
Sy11.8 in³
Zy23.1 in³
ry1.46 in

Other 2L8×4 sizes

Same nominal size, different weight — useful when you are checking a substitution or a lighter section.

2L8×4×7/16LLBB2L8×4×7/16×3/8LLBB2L8×4×7/16×3/4LLBB2L8×4×7/16SLBB2L8×4×7/16×3/8SLBB2L8×4×7/16×3/4SLBB2L8×4×1/2LLBB2L8×4×1/2×3/8LLBB2L8×4×1/2×3/4LLBB2L8×4×1/2SLBB2L8×4×1/2×3/8SLBB2L8×4×1/2×3/4SLBB2L8×4×9/16LLBB2L8×4×9/16×3/8LLBB2L8×4×9/16×3/4LLBB2L8×4×9/16SLBB2L8×4×9/16×3/8SLBB2L8×4×9/16×3/4SLBB2L8×4×5/8LLBB2L8×4×5/8×3/8LLBB2L8×4×5/8×3/4LLBB2L8×4×5/8SLBB2L8×4×5/8×3/8SLBB2L8×4×5/8×3/4SLBB

All 2L8×4 sizes and dimensions →

Similar weight double angles

Comparable 74.8 lb/ft sections in other double angle sizes.

2L6×6×174.8 lb/ft · Sx 17.1 in³2L6×6×1×3/874.8 lb/ft · Sx 17.1 in³2L6×6×1×3/474.8 lb/ft · Sx 17.1 in³2L8×8×3/477.8 lb/ft · Sx 24.4 in³2L8×8×3/4×3/877.8 lb/ft · Sx 24.4 in³2L8×8×3/4×3/477.8 lb/ft · Sx 24.4 in³2L8×6×7/8LLBB78.2 lb/ft · Sx 26.8 in³2L8×6×7/8×3/8LLBB78.2 lb/ft · Sx 26.8 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 2L8×4×1LLBB cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Double angles · Steel Beam Size Chart

Interactive drawing