StructureCalcsISA 20x20x3
Angle (ISA) · IS 808 · India
ISA 20x20x3 is an Indian standard angle with 20 × 20 mm legs, 3.0 mm thick, weighing 0.9 kg/m. The dimensions below are the published IS 808 values; the drawing is generated from them.
ISA angles brace and connect Indian steelwork; an angle bends about tilted principal axes, and the derived principal values below carry their angle.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Leg length, d | 20 mm | 0.79 in |
| Thickness, t | 3.0 mm | 0.118 in |
| Mass per metre | 0.9 kg/m | 0.6 lb/ft |
| Area, A | 110 mm² | 0.17 in² |
| Second moment, Ix | 4,400 mm⁴ | 0.0 in⁴ |
| Second moment, Iy | 4,400 mm⁴ | 0.0 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 ISA 20x20x3 the computed area is 0.91% from published and Ix 8.41%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zex | 290 mm³ |
| Elastic modulus, Zey | 290 mm³ |
| Plastic modulus, Zpx | 522 mm³ |
| Plastic modulus, Zpy | 522 mm³ |
| Radius of gyration, rx | 6.0 mm |
| Radius of gyration, ry | 6.0 mm |
| Principal maximum, Imax (derived) | 6,373 mm⁴ |
| Principal minimum, Imin (derived) | 1,687 mm⁴ |
| Principal axis angle, θp | 45.0° |
Ze is the elastic modulus and Zp the plastic modulus, following IS 800 notation.
Neighbouring sizes
Where these numbers come from
Published IS 808 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API