2L8×4×1/2×3/4SLBB 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.
2L8×4×1/2×3/4SLBB has a 8 in. long leg and a 4 in. short leg, 1/2 in. thick, in contact back to back.
It is a double angle set with its short legs back-to-back.
At 39.2 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 = 4.29 in³ and its moment of inertia Ix = 13.5 in⁴, with a plastic modulus Zx = 7.81 in³.
Detailing dimensions
| Long leg | 8" |
|---|---|
| Short leg | 4" |
| Thickness (t) | 1/2" |
Section properties
| Weight | 39.2 lb/ft |
|---|---|
| Area (A) | 11.6 in² |
| Ix | 13.5 in⁴ |
| Sx | 4.29 in³ |
| Zx | 7.81 in³ |
| rx | 1.08 in |
| Iy | 197 in⁴ |
| Sy | 23.5 in³ |
| Zy | 37.3 in³ |
| ry | 4.12 in |
Other 2L8×4 sizes
Same nominal size, different weight — useful when you are checking a substitution or a lighter section.
All 2L8×4 sizes and dimensions →
Similar weight double angles
Comparable 39.2 lb/ft sections in other double angle sizes.
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 2L8×4×1/2×3/4SLBB cut, formed, or fabricated? Huntington Steel & Supply Co.
Browse more: Double angles · Steel Beam Size Chart