ISA Equal Angle Weight Chart — All Sizes as per IS 808:1989
ISA equal angle sections range from 0.9 kg/m (ISA 20×20×3) to 73.6 kg/m (ISA 200×200×25) as per IS 808:1989.
- 38 standard ISA equal-leg angle designations under IS 808:1989 (Reaffirmed 2001)
- Most commonly stocked: ISA 50×50×5 (3.8 kg/m), ISA 65×65×6 (5.9 kg/m), ISA 75×75×8 (8.9 kg/m)
- Mass tolerance: ±2.5% per piece as per IS 1852 rolling and cutting tolerances
The ISA equal angle weight chart gives mass per metre, leg size, thickness, root radius, and cross-sectional area for all standard equal-leg angle sections in IS 808:1989. MS angle sections — referred to as MS angle ka weight in Indian fabrication — are the most versatile structural sections after pipes and beams. They are used for bracing, purlins, trusses, grating supports, and general fabrication across every sector of Indian construction.
What Is an ISA Equal Angle Section?
ISA stands for Indian Standard Angle. An equal-leg angle has both legs of the same length. The designation ISA A×A×t specifies leg length A in mm and thickness t in mm — for example, ISA 75×75×8 has 75 mm legs and 8 mm thickness, weighing 8.9 kg/m. IS 808:1989, titled Dimensions for Hot Rolled Steel Beam, Column, Channel and Angle Sections, specifies the exact dimensions for all ISA designations.
Equal-leg angles are hot-rolled in IS 2062 E250 grade by Jindal Steel and Power (JSPL Jindal Star), SAIL, and re-rolling mills across India. The smaller sizes (ISA 25 to ISA 65) are available from most stockists; larger sizes (ISA 150 and above) are typically sourced on indent. Angle sections are always quoted and sold by weight in kg — the kg/m value is the essential procurement reference.
MS Angle Weight Formula
Formula (approximation): Weight (kg/m) = (2A − t) × t × 0.7874 / 100
- A
- Leg length in millimetres (equal for both legs in ISA sections)
- t
- Leg thickness in millimetres
- 0.7874
- Constant derived from steel density 7,850 kg/m³ adjusted for angle section geometry
This formula gives an approximation. The exact IS 808:1989 values in the table below account for the root radius and toe radius of the hot-rolled section, which slightly reduce the theoretical area. For procurement, always use the tabulated IS 808 values — mills and suppliers weigh against these at the weighbridge.
ISA Equal Angle Weight Chart — IS 808:1989
| Section | Leg A (mm) | Thickness t (mm) | Root Radius r₁ (mm) | Area (cm²) | Weight (kg/m) |
|---|---|---|---|---|---|
| ISA 20×20×3 | 20 | 3 | 3.5 | 1.13 | 0.9 |
| ISA 25×25×3 | 25 | 3 | 3.5 | 1.43 | 1.1 |
| ISA 25×25×5 | 25 | 5 | 3.5 | 2.26 | 1.8 |
| ISA 30×30×3 | 30 | 3 | 5.0 | 1.74 | 1.4 |
| ISA 30×30×5 | 30 | 5 | 5.0 | 2.77 | 2.2 |
| ISA 35×35×5 | 35 | 5 | 5.0 | 3.27 | 2.6 |
| ISA 40×40×5 | 40 | 5 | 6.0 | 3.79 | 3.0 |
| ISA 45×45×5 | 45 | 5 | 6.0 | 4.30 | 3.4 |
| ISA 50×50×5 | 50 | 5 | 7.0 | 4.80 | 3.8 |
| ISA 50×50×6 | 50 | 6 | 7.0 | 5.69 | 4.5 |
| ISA 55×55×6 | 55 | 6 | 7.0 | 6.29 | 4.9 |
| ISA 60×60×6 | 60 | 6 | 8.0 | 6.91 | 5.4 |
| ISA 65×65×6 | 65 | 6 | 8.0 | 7.51 | 5.9 |
| ISA 65×65×8 | 65 | 8 | 8.0 | 9.76 | 7.7 |
| ISA 70×70×6 | 70 | 6 | 9.0 | 8.13 | 6.4 |
| ISA 75×75×6 | 75 | 6 | 9.0 | 8.74 | 6.9 |
| ISA 75×75×8 | 75 | 8 | 9.0 | 11.38 | 8.9 |
| ISA 75×75×10 | 75 | 10 | 9.0 | 13.94 | 10.9 |
| ISA 80×80×8 | 80 | 8 | 9.0 | 12.18 | 9.6 |
| ISA 90×90×8 | 90 | 8 | 10.0 | 13.78 | 10.8 |
| ISA 90×90×10 | 90 | 10 | 10.0 | 16.92 | 13.3 |
| ISA 100×100×8 | 100 | 8 | 11.0 | 15.39 | 12.1 |
| ISA 100×100×10 | 100 | 10 | 11.0 | 18.99 | 14.9 |
| ISA 100×100×12 | 100 | 12 | 11.0 | 22.43 | 17.6 |
| ISA 110×110×10 | 110 | 10 | 12.0 | 20.99 | 16.5 |
| ISA 110×110×12 | 110 | 12 | 12.0 | 24.88 | 19.5 |
| ISA 120×120×10 | 120 | 10 | 13.0 | 22.99 | 18.1 |
| ISA 120×120×12 | 120 | 12 | 13.0 | 27.33 | 21.4 |
| ISA 130×130×10 | 130 | 10 | 13.0 | 24.99 | 19.6 |
| ISA 130×130×12 | 130 | 12 | 13.0 | 29.78 | 23.4 |
| ISA 150×150×10 | 150 | 10 | 16.0 | 29.00 | 22.8 |
| ISA 150×150×12 | 150 | 12 | 16.0 | 34.58 | 27.2 |
| ISA 150×150×15 | 150 | 15 | 16.0 | 42.68 | 33.5 |
| ISA 175×175×12 | 175 | 12 | 16.0 | 40.57 | 31.9 |
| ISA 175×175×15 | 175 | 15 | 16.0 | 50.19 | 39.4 |
| ISA 200×200×15 | 200 | 15 | 18.0 | 57.69 | 45.3 |
| ISA 200×200×18 | 200 | 18 | 18.0 | 68.50 | 53.8 |
| ISA 200×200×25 | 200 | 25 | 18.0 | 93.75 | 73.6 |
All values per IS 808:1989 (Reaffirmed 2001). Mass tolerance: ±2.5% per piece per IS 1852. Values match Jindal Star structural section catalogue.
Most Common ISA Sizes in Indian Fabrication
Not all 38 sizes are stocked by every supplier. The sizes below are available from virtually every structural steel stockist in India and can be sourced without indent lead time.
| Section | Weight (kg/m) | 6 m piece (kg) | Typical use |
|---|---|---|---|
| ISA 50×50×5 | 3.8 | 22.8 | Light bracing, grating supports, small trusses |
| ISA 65×65×6 | 5.9 | 35.4 | Purlin bracings, secondary roof members |
| ISA 75×75×6 | 6.9 | 41.4 | Roof purlins, side rails |
| ISA 75×75×8 | 8.9 | 53.4 | Primary bracings, lattice truss members |
| ISA 90×90×8 | 10.8 | 64.8 | Heavy bracings, crane girder stiffeners |
| ISA 100×100×10 | 14.9 | 89.4 | Heavy structural bracings, column bases |
6 m piece weight = kg/m × 6. Add 2.5% IS 1852 tolerance for procurement quantity.
Worked Example
A fabricator in Ahmedabad is cutting bracing members for an industrial shed: 48 pieces of ISA 65×65×6, each 1,850 mm long. Step 1 — weight per piece: 5.9 kg/m × 1.850 m = 10.9 kg. Step 2 — total weight: 48 × 10.9 = 523.5 kg. Step 3 — procurement quantity with 2.5% tolerance allowance: 523.5 × 1.025 = 536.6 kg. Order 540 kg to allow for tolerance and end-trim waste.
ISA vs ISUA — Which Term Is Correct?
IS 808:1989 uses only the designation ISA for both equal and unequal leg angles. The term ISUA (Indian Standard Unequal Angle) appears on older drawings and some supplier catalogues but is not defined in the current standard. When you see ISUA on a drawing, match the leg dimensions against the IS 808 unequal angle table to identify the correct section. For equal-leg angles, ISA A×A×t is always the correct designation.
Frequently Asked Questions
What is the weight of ISA 65×65×6 per metre?
ISA 65×65×6 weighs 5.9 kg per metre as per IS 808:1989. Cross-sectional area is 7.51 cm², root radius is 8.0 mm. A 6-metre stock length weighs 35.4 kg.
What is the weight of ISA 75×75×8 per metre?
ISA 75×75×8 weighs 8.9 kg per metre as per IS 808:1989. Cross-sectional area is 11.38 cm². A 6-metre length weighs 53.4 kg and a 1.2-metre piece weighs 10.68 kg.
ISA 65×65×6 ka weight per metre kitna hota hai?
IS 808:1989 ke anusar ISA 65×65×6 ka weight 5.9 kg/m hota hai. 6 metre ki ek length ka total weight 35.4 kg hoga. Procurement ke liye 2.5% IS 1852 tolerance add karna na bhoolein.
What is the weight of ISA 90×90×8 per metre?
ISA 90×90×8 weighs 10.8 kg per metre as per IS 808:1989. Cross-sectional area is 13.78 cm². A 6-metre stock length weighs 64.8 kg.
How do I calculate the weight of an MS angle section?
Multiply the kg/m value from the IS 808:1989 table by the length in metres. For example, ISA 75×75×8 at 8.9 kg/m — a 2.5 m piece weighs 8.9 × 2.5 = 22.25 kg. For procurement, add 2.5% for the IS 1852 mass tolerance. Do not use the formula for procurement — always use the tabulated IS 808 values as these are what mills measure against.
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