2L8×4×3/4SLBB 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.

2L8×4×3/4SLBB has a 8 in. long leg and a 4 in. short leg, 3/4 in. thick, in contact back to back.

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

At 57.4 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 = 6.14 in³ and its moment of inertia Ix = 18.7 in⁴, with a plastic modulus Zx = 11.6 in³.

Detailing dimensions

Long leg8"
Short leg4"
Thickness (t)3/4"

Section properties

Weight57.4 lb/ft
Area (A)17 in²
Ix18.7 in⁴
Sx6.14 in³
Zx11.6 in³
rx1.05 in
Iy257 in⁴
Sy32.1 in³
Zy49.9 in³
ry3.89 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 57.4 lb/ft sections in other double angle sizes.

2L6×6×3/457.4 lb/ft · Sx 13.3 in³2L6×6×3/4×3/857.4 lb/ft · Sx 13.3 in³2L6×6×3/4×3/457.4 lb/ft · Sx 13.3 in³2L8×6×5/8LLBB57 lb/ft · Sx 19.7 in³2L8×6×5/8×3/8LLBB57 lb/ft · Sx 19.7 in³2L8×6×5/8×3/4LLBB57 lb/ft · Sx 19.7 in³2L8×6×5/8SLBB57 lb/ft · Sx 11.8 in³2L8×6×5/8×3/8SLBB57 lb/ft · Sx 11.8 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 2L8×4×3/4SLBB cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Double angles · Steel Beam Size Chart

Interactive drawing