ISA 30×20×3 Weight, Dimensions and IS 808 Properties
ISA 30×20×3 weighs 1.1 kg per metre as per IS 808:1989.
- One 6-metre length weighs 6.6 kg · one 12-metre length weighs 13.2 kg
- Long leg 30 mm · short leg 20 mm · thickness 3 mm · area 1.43 cm²
- Maximum principal moment of inertia Iuu = 1.51 cm⁴
ISA 30×20×3 is the smallest standard unequal-leg angle in IS 808:1989. At 1.1 kg/m it is used for light edge cleating, shelf stiffeners, and secondary connection clips where a compact asymmetric profile is needed and weight must be minimised.
ISA 30×20×3 Weight Calculator
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ISA 30×20×3 — Weight Calculator
IS 808:1989 Dimensions and Sectional Properties
| Property | Symbol | Unit | Value |
|---|---|---|---|
| Long leg | A | mm | 30 |
| Short leg | B | mm | 20 |
| Thickness | t | mm | 3 |
| Cross-sectional area | A | cm² | 1.43 |
| Mass per metre | — | kg/m | 1.1 |
| Centroid from back of long leg | Cxx | cm | 0.84 |
| Centroid from back of short leg | Cyy | cm | 0.44 |
| Moment of inertia (x–x) | Ixx | cm⁴ | 1.33 |
| Moment of inertia (y–y) | Iyy | cm⁴ | 0.44 |
| Moment of inertia (u–u, max principal) | Iuu | cm⁴ | 1.51 |
| Moment of inertia (v–v, min principal) | Ivv | cm⁴ | 0.26 |
| Elastic section modulus (x–x) | Zxx | cm³ | 0.66 |
| Elastic section modulus (y–y) | Zyy | cm³ | 0.31 |
| Radius of gyration (u–u) | ruu | cm | 1.03 |
| Radius of gyration (v–v) | rvv | cm | 0.43 |
| Tangent of principal axis angle | tan α | — | 0.395 |
Dimensions and properties as per IS 808:1989 (reaffirmed 2021). x–x axis is parallel to the long leg; y–y axis is parallel to the short leg; u–u is the maximum principal axis at angle α to x–x. Mass tolerance: ±3% per piece per IS 808.
Common Applications of ISA 30×20×3
ISA 30×20×3 is used for light edge cleating on sheet metal frames, shelf stiffener clips, secondary connection angles in light-gauge fabrication, and trim angles on access panels. The small asymmetric profile allows one leg to sit flat against a face plate while the other provides a seating edge. General steel merchants stock this size in IS 2062 E250 grade in 6 m lengths; it is also available cut-to-length from angle processing centres in Gujarat and Maharashtra.
Worked Example
A fabricator in Ahmedabad needs 120 shelf-support clips of ISA 30×20×3, each 80 mm long, for a light storage rack system. Total length = 120 × 0.08 = 9.6 m. Weight = 9.6 × 1.1 = 10.6 kg. At ₹63,000 per tonne (Ahmedabad, May 2026), material cost is approximately ₹668 before cutting charges.
Related ISA Unequal Angle Sections
Compare with adjacent sizes: no smaller standard unequal ISA in IS 808:1989 · ISA 40×25×4 (1.9 kg/m). For all ISA unequal angles see the Section Reference Library →
Frequently Asked Questions
What is the weight of ISA 30×20×3 per metre?
ISA 30×20×3 weighs 1.1 kg per metre as specified in IS 808:1989. For a standard 6-metre length, the total weight is 6.6 kg. For a 12-metre length, total weight is 13.2 kg.
ISA 30×20×3 ka weight per meter kitna hota hai?
IS 808:1989 standard ke according, ISA 30×20×3 ka weight 1.1 kg/m hota hai. 6 metre ki ek length ka total weight 6.6 kg hoga. Zyada accurate calculation ke liye upar diya gaya calculator use karein.
What are the dimensions of ISA 30×20×3?
ISA 30×20×3 per IS 808:1989 has a long leg of 30 mm, short leg of 20 mm, thickness of 3 mm, and cross-sectional area of 1.43 cm².
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