StructureCalcs2L8X4X3/4LLBB
Double Angle · AISC Shapes Database v15.0 · United States
2L8X4X3/4LLBB is a double angle 102 mm deep × 203 mm wide, 19.1 mm thick, weighing 85.4 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
Double angles pair two matching angles back to back — the classic bolted truss chord and web member, tabulated for the pair acting together.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Overall depth, d | 102 mm | 4.00 in |
| Overall width, b | 203 mm | 8.00 in |
| Angle thickness, t | 19.1 mm | 0.750 in |
| Mass per metre | 85.4 kg/m | 57.4 lb/ft |
| Area, A | 10,968 mm² | 17.00 in² |
| Second moment, Ix | 45,785,457 mm⁴ | 110.0 in⁴ |
| Second moment, Iy | 14,276,738 mm⁴ | 34.3 in⁴ |
Derived section properties
Integrated from a square-cornered outline — the fillet radii this family really has are not drawn, so the computed values differ slightly from published. For 2L8X4X3/4LLBB the computed area is 0.74% from published and Ix 0.20%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Sx | 356,437 mm³ |
| Elastic modulus, Sy | 139,450 mm³ |
| Plastic modulus, Zx | 617,972 mm³ |
| Plastic modulus, Zy | 263,473 mm³ |
| Radius of gyration, rx | 64.8 mm |
| Radius of gyration, ry | 36.1 mm |
S is the elastic modulus and Z the plastic modulus, following AISC 360. Australian and British practice reverse the letters.
Neighbouring sizes
Where these numbers come from
Published AISC Shapes Database v15.0 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API