StructureCalcs2L4X3X1/2LLBB
Double Angle · AISC Shapes Database v15.0 · United States
2L4X3X1/2LLBB is a double angle 76 mm deep × 102 mm wide, 12.7 mm thick, weighing 33.0 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 | 76 mm | 3.00 in |
| Overall width, b | 102 mm | 4.00 in |
| Angle thickness, t | 12.7 mm | 0.500 in |
| Mass per metre | 33.0 kg/m | 22.2 lb/ft |
| Area, A | 4,194 mm² | 6.50 in² |
| Second moment, Ix | 4,162,314 mm⁴ | 10.0 in⁴ |
| Second moment, Iy | 3,829,329 mm⁴ | 9.2 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 2L4X3X1/2LLBB the computed area is better than 0.01% from published and Ix 0.97%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Sx | 61,898 mm³ |
| Elastic modulus, Sy | 50,754 mm³ |
| Plastic modulus, Zx | 105,886 mm³ |
| Plastic modulus, Zy | 88,080 mm³ |
| Radius of gyration, rx | 31.7 mm |
| Radius of gyration, ry | 30.4 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