ISA 120×80×8 Weight, Dimensions and IS 808 Properties
ISA 120×80×8 weighs 12.1 kg per metre as per IS 808:1989.
- One 6-metre length weighs 72.6 kg · one 12-metre length weighs 145.2 kg
- Long leg 120 mm · short leg 80 mm · thickness 8 mm · area 15.36 cm²
- Maximum principal moment of inertia Iuu = 266.73 cm⁴
ISA 120×80×8 is a standard unequal-leg angle in IS 808:1989. At 12.1 kg/m with a 120 mm long leg and 80 mm short leg, it is used for medium-to-heavy bracing members in industrial portal frames, crane-gantry runway beam connection cleats, truss chord splice angles, and staircase stringer main sections.
ISA 120×80×8 Weight Calculator
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ISA 120×80×8 — Weight Calculator
IS 808:1989 Dimensions and Sectional Properties
| Property | Symbol | Unit | Value |
|---|---|---|---|
| Long leg | A | mm | 120 |
| Short leg | B | mm | 80 |
| Thickness | t | mm | 8 |
| Cross-sectional area | A | cm² | 15.36 |
| Mass per metre | — | kg/m | 12.1 |
| Centroid from back of long leg | Cxx | cm | 2.66 |
| Centroid from back of short leg | Cyy | cm | 1.56 |
| Moment of inertia (x–x) | Ixx | cm⁴ | 237.5 |
| Moment of inertia (y–y) | Iyy | cm⁴ | 65.07 |
| Moment of inertia (u–u, max principal) | Iuu | cm⁴ | 266.73 |
| Moment of inertia (v–v, min principal) | Ivv | cm⁴ | 35.84 |
| Elastic section modulus (x–x) | Zxx | cm³ | 28.51 |
| Elastic section modulus (y–y) | Zyy | cm³ | 11.25 |
| Radius of gyration (u–u) | ruu | cm | 4.17 |
| Radius of gyration (v–v) | rvv | cm | 1.53 |
| Tangent of principal axis angle | tan α | — | 0.38 |
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 120×80×8
ISA 120×80×8 is used for medium-to-heavy bracing members in industrial portal frames, crane-gantry runway beam connection cleats, truss chord splice angles, and staircase stringer main sections. General steel merchants and angle stockists carry this size in IS 2062 E250 grade in 6 m and 12 m lengths. JSPL, SAIL, and RINL (Vizag Steel) all roll this designation to IS 808:1989 as standard stock.
Worked Example
A fabricator in Ahmedabad needs 8 diagonal bracing members in a 24 m × 48 m industrial portal frame using ISA 120×80×8, each 1800 mm long. Total length = 8 × 1.8 = 14.4 m. Weight = 14.4 × 12.1 = 174.2 kg. At ₹63,000 per tonne (Ahmedabad, May 2026), material cost is approximately ₹10,974 before cutting charges.
Related ISA Unequal Angle Sections
Compare with adjacent sizes: ISA 100×75×10 (12.9 kg/m) · ISA 120×80×10 (14.9 kg/m). For all ISA unequal angles see the Section Reference Library →
Frequently Asked Questions
What is the weight of ISA 120×80×8 per metre?
ISA 120×80×8 weighs 12.1 kg per metre as specified in IS 808:1989. For a standard 6-metre length, the total weight is 72.6 kg. For a 12-metre length, total weight is 145.2 kg.
ISA 120×80×8 ka weight per meter kitna hota hai?
IS 808:1989 standard ke according, ISA 120×80×8 ka weight 12.1 kg/m hota hai. 6 metre ki ek length ka total weight 72.6 kg hoga. Zyada accurate calculation ke liye upar diya gaya calculator use karein.
What are the dimensions of ISA 120×80×8?
ISA 120×80×8 per IS 808:1989 has a long leg of 120 mm, short leg of 80 mm, thickness of 8 mm, and cross-sectional area of 15.36 cm².
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