StructureCalcsISA 55x55x5
Angle (ISA) · IS 808 · India
ISA 55x55x5 is an Indian standard angle with 55 × 55 mm legs, 5.0 mm thick, weighing 4.1 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.
Analyse this section, or combine it with plates and other shapes.
Open ISA 55x55x5 in the Section CalculatorFree, no sign-up, runs in your browser.
Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Leg length, d | 55 mm | 2.17 in |
| Thickness, t | 5.0 mm | 0.197 in |
| Mass per metre | 4.1 kg/m | 2.8 lb/ft |
| Area, A | 520 mm² | 0.81 in² |
| Second moment, Ix | 154,000 mm⁴ | 0.4 in⁴ |
| Second moment, Iy | 154,000 mm⁴ | 0.4 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 55x55x5 the computed area is 0.96% from published and Ix 1.50%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zex | 3,850 mm³ |
| Elastic modulus, Zey | 3,850 mm³ |
| Plastic modulus, Zpx | 6,935 mm³ |
| Plastic modulus, Zpy | 6,935 mm³ |
| Radius of gyration, rx | 17.0 mm |
| Radius of gyration, ry | 17.0 mm |
| Principal maximum, Imax (derived) | 241,719 mm⁴ |
| Principal minimum, Imin (derived) | 61,659 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