StructureCalcs2L7X4X1/2LLBB
Double Angle · AISC Shapes Database v15.0 · United States
2L7X4X1/2LLBB is a double angle 102 mm deep × 178 mm wide, 12.7 mm thick, weighing 53.3 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 | 178 mm | 7.00 in |
| Angle thickness, t | 12.7 mm | 0.500 in |
| Mass per metre | 53.3 kg/m | 35.8 lb/ft |
| Area, A | 6,774 mm² | 10.50 in² |
| Second moment, Ix | 22,143,512 mm⁴ | 53.2 in⁴ |
| Second moment, Iy | 9,073,845 mm⁴ | 21.8 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 2L7X4X1/2LLBB the computed area is better than 0.01% from published and Ix 0.19%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Sx | 190,574 mm³ |
| Elastic modulus, Sy | 89,617 mm³ |
| Plastic modulus, Zx | 336,959 mm³ |
| Plastic modulus, Zy | 157,725 mm³ |
| Radius of gyration, rx | 57.2 mm |
| Radius of gyration, ry | 36.7 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