2L7×4×3/4LLBB 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.
2L7×4×3/4LLBB has a 7 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 long legs back-to-back.
At 52.4 lb per foot it is one of the 30 2L7×4 sizes, which run from 27.2 to 52.4 lb/ft.
For strong-axis bending its section modulus is Sx = 16.8 in³ and its moment of inertia Ix = 75.6 in⁴, with a plastic modulus Zx = 29.6 in³.
Detailing dimensions
| Long leg | 7" |
|---|---|
| Short leg | 4" |
| Thickness (t) | 3/4" |
Section properties
| Weight | 52.4 lb/ft |
|---|---|
| Area (A) | 15.5 in² |
| Ix | 75.6 in⁴ |
| Sx | 16.8 in³ |
| Zx | 29.6 in³ |
| rx | 2.21 in |
| Iy | 34 in⁴ |
| Sy | 8.5 in³ |
| Zy | 15.5 in³ |
| ry | 1.48 in |
Other 2L7×4 sizes
Same nominal size, different weight — useful when you are checking a substitution or a lighter section.
All 2L7×4 sizes and dimensions →
Similar weight double angles
Comparable 52.4 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 2L7×4×3/4LLBB cut, formed, or fabricated? Huntington Steel & Supply Co.
Browse more: Double angles · Steel Beam Size Chart